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1
Liu, Ji, Donge Zhao, Yangjun Li e Hanchang Zhou. "Optoelectronic System for Measuring Warhead Fragments Velocity". Journal of Physics: Conference Series 276 (1 febbraio 2011): 012136. http://dx.doi.org/10.1088/1742-6596/276/1/012136.
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2
Markina, O. M., e M. O. Tykhan. "Research of illuminating parameters halogen-filled and LED lamp for optoelectronic measuring system". Archives of Materials Science and Engineering 1, n. 94 (1 novembre 2018): 18–26. http://dx.doi.org/10.5604/01.3001.0012.7804.
Testo completoAbstract (sommario):
Purpose: The purpose of this paper is to study and compare the light and technical characteristics of halogen and LED-lamps and to determine the effect of lighting quality on the accuracy of the measurement of the optoelectronic control system for the micrometer sizes of the prescription objects. Design/methodology/approach: The research approach is determined by the analysis and comparison of the lighting characteristics of lamps manufactured for mass production and the detection of the possibility of using these sources for optoelectronic measuring systems for the micrometric range. Lighting characteristics were investigated by the goniophotometric method and the method of the integration sphere. Findings: During the analysis of the results of experimental studies, a discrepancy in the lighting characteristics of the lamps was found compared to those indicated by the manufacturers. This difference in the indicators of the lighting characteristics was: for the light flux 2.92% halogen lamp (13.4% LED); correlated colour temperature by 0.7% halogen lamp (1.6% LED); for current – 7.34% halogen lamp (8.7% LED); for power – 7.31% halogen lamp (7.54% LED). The accuracy of measuring the size with a halogen lamp is 20 ± 0.96 μm, and with LED – 20 ± 0.23 μm. Research limitations/implications: The result of comparing the accuracy of the measurement for the optoelectronic measuring system of the geometric dimensions is the measure of absolute contrast with the use of LED lighting is four times better than halogen. Practical implications: Using the results of the study of the light characteristics of lamps described in the article, it is possible to improve any optoelectronic measuring system. Originality/value: The originality of the results of the article is the experimental data of the lighting characteristics studies of the lamps used in the optoelectronic measuring system.
3
Vasilevskii, A. M., G. A. Konoplev, D. A. Svetlov, V. A. Gerasimov, D. K. Kostrin e A. A. Ukhov. "Optoelectronic Data Measuring System for Monitoring Polyhexamethylene Guanidine-Based Decontaminants". Biomedical Engineering 48, n. 1 (maggio 2014): 13–16. http://dx.doi.org/10.1007/s10527-014-9405-6.
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4
Markina, O. M. "Lighting setting features of opto-electronic measuring system for controlling adhesive joints optical components". Journal of Achievements in Materials and Manufacturing Engineering 2, n. 84 (1 ottobre 2017): 49–57. http://dx.doi.org/10.5604/01.3001.0010.7781.
Testo completoAbstract (sommario):
Purpose: The purpose of this article is to study the features of setting and selecting the source of illumination of the optoelectronic measuring system for the control of adhesive joints of optical parts. Design/methodology/approach: The research and analysis of the lighting characteristics of halogen and LED lamps, used as a source of illumination in the measuring system, was carried out. Findings: In the course of experimental studies, the sensitivity and resolution of fixing defects of adhesive joints of optical parts were increased and the measurement error was reduced from 10 ± 1.2 microns to 10 ± 0.3 microns. Research limitations/implications: The limitations of the accuracy of the measurement are 10 ± 0.3 microns of adhesive defects, since the studies were conducted on separate samples of glues that did not cover all adhesives for the connection of optical surfaces and the thickness of glass surfaces was 1 mm and 2 mm. Practical implications: With the application of the lighting system approach described in the article, it is possible to improve any optoelectronic measuring system, thereby increasing the accuracy of the measurement. Originality/value: The originality of the results of the article is the experimental data of the studies of light-technical characteristics of the halogen lamp, which is used in the optoelectronic measuring system.
5
Savich, A. I., e V. V. Makarenko. "Optical tracking system containing an optoelectronic converter for measuring complicated shapes". Measurement Techniques 30, n. 11 (novembre 1987): 1095–98. http://dx.doi.org/10.1007/bf00865067.
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Pulov, Dimcho, e Tsanko Karadzhov. "OPTOELECTRONIC DEVICE FOR MEASURING THE POWER OF LASER RADIATION". ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (16 giugno 2021): 286–90. http://dx.doi.org/10.17770/etr2021vol3.6590.
Testo completoAbstract (sommario):
A device for measuring the power of the laser radiation.has been designed. The device consists of transmitter and receiving part. The transmitter includes optical radiation source and optical system for collimation of radiation. The receiver part consists of silicon photodiodes, electronic signal processing unit and unit for measurements.
7
Arakantsev, Konstantin G., Igor A. Konyakhin e Alexander N. Timofeev. "Inner-Base Optoelectronic System for the Control of Linear Displacements". Key Engineering Materials 437 (maggio 2010): 237–41. http://dx.doi.org/10.4028/www.scientific.net/kem.437.237.
Testo completoAbstract (sommario):
The control of railway track position is an important application area for coordinate measuring optoelectronic systems. One of the methods for the railway track control consists in determination of railway track position relatively to reference marks, which are mounted along the track [1]. In general case this system should be mounted on liner-tamper-surfacer and provide measurements of reference marks coordinates. Marks can be positioned up to 10 meters from track and measurements must be carried out in automatic mode. It has been decided to project the system on basis of inner-base rangefinder’s scheme [2].
8
Parfiryev, A. V., O. V. Parfiryeva e A. V. Dushkin. "Optimization of the algorithm of information analysis and processing in the optoelectronic system". Proceedings of Universities. Electronics 27, n. 1 (febbraio 2022): 106–19. http://dx.doi.org/10.24151/1561-5405-2022-27-1-106-119.
Testo completoAbstract (sommario):
The accuracy of the coordinates of ground objects measured using optical instruments by unmanned aerial vehicles depends on many factors including: errors in measuring the angular coordinates of the optical system, the distance to the object, the presence of heterogeneous terrain, etc. Traditional use of optoelectronic systems functioning based on inertial sensors demonstrated their flaws, such as low accuracy at ground objects positioning for target designation to unmanned aerial vehicles due to declination angle and azimuth determination inaccuracy. In this work, a variant of optimizing the algorithm for analyzing and processing information in an optoelectronic system for determining the coordinates of ground objects from an unmanned aerial vehicle is presented. An algorithm and a method for determining geographical coordinates based on an electronic height matrix have been developed. An increase in the accuracy of calculating the coordinates of an object was achieved by minimizing the error of measuring the declination angle, azimuth on a ground object and inclined range. A description of a full-scale experiment with a car on the ground is given. Its essence was that according to several freeze frames obtained by the optoelectronic system of an unmanned aerial vehicle at a considerable distance with a large inclined range, the geographical coordinates of the car were determined in two ways (traditional and developed). With the help of the method proposed by the authors, the accuracy of determining coordinates has been increased several times. The developed algorithm and method for information processing make it possible to create a variety of hardware and software solutions for guidance and target designation systems of unmanned aerial vehicles.
9
Liu, Qi Fang. "Measuring Coaxiality with Optoelectronic and Non-Contact Based on Helical Scanning". Advanced Materials Research 588-589 (novembre 2012): 1002–5. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.1002.
Testo completoAbstract (sommario):
In view of the characteristic of the inefficiency on measuring coaxiality manually in industry, we put forward to studying on a laser triangulation san method[1] for measuring distance to measure coaxiality. It takes relative motion between the measurement thing and displacement laser sensor to implement helical scan motion and gain the data of spiral scanning projection based on step servo system by gyration and the axial feed. This method can improve manufacture efficiency and achieve the demand of online automatic testing. Finally, the way of implementation of this system would be discussed in this paper, meanwhile, it would provide simulation results of the method and actually feasibility analysis .
10
Konyakhin, I. A., A. D. Merson e D. Y. Zubenko. "Optoelectronic System for Roll Angles Measuring of Maneuvering Objects Based on Anamorphosis Effect". Journal of Physics: Conference Series 48 (1 ottobre 2006): 988–91. http://dx.doi.org/10.1088/1742-6596/48/1/184.
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Chu, Wenbo, Bin Zhang, Baowei Liu, Zhiguo Gui e Donge Zhao. "An Optoelectronic Targeting System for Measuring the Distribution of Projectile Motion Based on the Subdivision of a Light Screen". Photonics 6, n. 4 (12 dicembre 2019): 126. http://dx.doi.org/10.3390/photonics6040126.
Testo completoAbstract (sommario):
This paper proposes a cost-effective, compact, noncontacting optoelectronic targeting system for measuring the distribution of projectile motion. The major elements of this system include a light emitting diode (LED) array, photodiode detecting array, double-layered aperture arrays, adaptive threshold circuit, and date acquisition. Through cooperating with double-layered aperture arrays, the system effectively reduces the radiation width of the light source to the photodiode detecting surface, and filters out the influence of incident light from the adjacent apertures on both sides above each photodiode to the corresponding photodiode detecting surface. It realizes that the response of the photodiode array corresponds to the coordinates of the light screen one by one. Through the sensitivity analysis of the light screen of the system, the system detecting threshold when the projectile passes through the light screen is calculated, and the corresponding adaptive threshold circuit is designed to prevent misjudgment when the system works. The measuring error of the system can reach ±2 mm by experimental verification. Compared with other projectile’s distribution measuring systems, the proposed system has the advantages of having high precision, convenient debugging, is nondestructive, and is a noncontact system.
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PORADA, ZBIGNIEW W. "OPTOELECTRONIC LOGICAL-CIRCUITS CONTROLLED AUTOMOTIVE ELECTROLUMINESCENT DASHBOARD DISPLAY". Journal of Circuits, Systems and Computers 05, n. 01 (marzo 1995): 37–43. http://dx.doi.org/10.1142/s0218126695000047.
Testo completoAbstract (sommario):
In modern automotive vehicles, sophisticated measuring systems, which convert and display stored data to the driver, have been used. One of the basic problems is the mode of data transmission to the driver. A general usable mode for transmitting the driver's information is optical signalling which can be realized with the aid of electroluminescent dashboard displays. Automotive electroluminescent dashboard displays applied for data transmission may be controlled by optoelectronic logical circuits which are practically insensitive to electromagnetic interference. The most interesting are memory cells which contain two photoconducting (PC) and two electroluminescent (EL) units. Between a single EL unit and a single PC unit, optical feedback can be provided so that these two units constitute a bistable system. Experimental investigations of the above mentioned units will be presented.
13
Kul’chin, Yu N., I. V. Denisov e O. T. Kamenev. "Optoelectronic neural system for processing the output data from a fiber-optic measuring network". Technical Physics Letters 25, n. 3 (marzo 1999): 235–36. http://dx.doi.org/10.1134/1.1262435.
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Lyashenko, V., V. Zozulia, O. Yula, V. Mazur e V. Strelbitskyi. "GROUND of COMPOSITION AND TAKTIKO-TEKHNICHNIKH DESCRIPTIONS of PERSPECTIVE MOBILE OPTICAL-ELECTRONIC COMPLEX of TRAJECTORY MEASURINGS". Наукові праці Державного науково-дослідного інституту випробувань і сертифікації озброєння та військової техніки, n. 4 (19 agosto 2020): 63–74. http://dx.doi.org/10.37701/dndivsovt.4.2020.08.
Testo completoAbstract (sommario):
For some time past the careful attention of researches requires the issues of analyzing qualities of test objects and compliance actually received tactical and technical characteristics with specified operational requirements, it is necessary to get the parameters of high-precision trajectory measurements that will enable comparison (deviation) of the real trajectory from the reference trajectory (pattern trajectory); evaluate the operating benefit of the test objects; identify the causes of nonconformities of tactical and technical characteristics to requirements, which can be detected. Today for measuring the trajectory parameters of the test objects using equipment, which operates on different physical principles. It refers also to the electro-optics equipment, in which implemented process of target tracking for the purpose of obtaining on a real time basis initial information, further processing which will allow to calculate highly precise trajectory parameters of test objects.
Therefore, the purpose of the article was a justification for composition and tactical and technical characteristics of prospective mobile optoelectronic complex of trajectory measurements.
On the basis of the modern analysis of the objects of ground tests, their main characteristics, as well as the tactical and technical characteristics of modern mobile optoelectronic complex of trajectory measurements of domestic and foreign production and taking into account the “General requirements for mobile optoelectronic station of externally - trajectory measurements” from 01 October 2017, the project of composition and the tactical and technical characteristics prospective mobile optoelectronic complex of trajectory measurements was justified.
Research design - the theory of probability, system analysis and synthesis of organizational-technical systems, theory efficiency and optimization, simulation of complex technical systems.
The main results, obtained in the work:
- composition and the tactical and technical characteristics prospective mobile optoelectronic complex of trajectory measurements were justified;
- general requirements to the mobile optoelectronic complex of trajectory measurements were developed;
The practical importance lies in the possibility of creating mobile optoelectronic complex of trajectory measurements of domestic production to conduct testing of new and modernized specimens of weapons and military equipment.
The study is novel in that it: general requirements to the mobile optoelectronic complex of trajectory measurements were developed; the project of terms of reference for the creation of a mobile optoelectronic complex of trajectory measurements of domestic production was worked out to provide testing of specimens of weapons and military equipment.
15
Chen, C. J., P. D. Lin e W. Y. Jywe. "An optoelectronic measurement system for measuring 6-degree-of-freedom motion error of rotary parts". Optics Express 15, n. 22 (2007): 14601. http://dx.doi.org/10.1364/oe.15.014601.
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Taranova, Ludmila S., e Igor O. Mikhailov. "OPERATING PRINCIPLE OF THE DEVICE FOR MEASURING THE GEOMETRIC CHARACTERISTICS OF THE GUN BARREL". Interexpo GEO-Siberia 6 (21 maggio 2021): 287–92. http://dx.doi.org/10.33764/2618-981x-2021-6-287-292.
Testo completoAbstract (sommario):
The article presents the principle of operation of the measuring device, which is based on an internal gauge that moves along the barrel bore using a movement system fixed on the end surface. The article presents the principle of operation of the optoelectronic module, which is designed for contact measurement of deviations of linear dimensions from the reference ones. This measuring device is multifunctional, and is designed not only to determine the diameter of the barrel in many sections, but also to construct its profile, taking into account the curvature of the channel.
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Xiong, Chunbao, Hongzhi Bai e Jiarui Lin. "Potential of Workshop Measurement Positioning System to Measure Oscillation Frequencies of Rigid Structures". Applied Sciences 9, n. 3 (11 febbraio 2019): 595. http://dx.doi.org/10.3390/app9030595.
Testo completoAbstract (sommario):
A workshop measuring and positioning system (wMPS) is a large three-dimensional (3D) coordinate-measurement system based on optoelectronic scanning. It is capable of large-range coverage, high measurement accuracy and frequency, and multi-task synchronous measurement. Existing geodetic instruments cannot measure the intrinsic parameters of strong rigid structures. Thus, this study conducted experiments to explore the feasibility of the wMPS to measure the intrinsic parameters of rigid structures. A test bed was established using a reverse-engineering method to simulate the oscillation frequency of the structure. Displacement data, which changed with the time series through the fast Fourier transformation method, were analyzed to determine the feasibility and range of the wMPS in measuring intrinsic parameters of the structure. The experimental results demonstrated that the wMPS can measure the vibrational frequency up to 9 Hz with a 3-mm amplitude and up to 4 Hz with a 30-mm amplitude.
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Chu, Wenbo, Donge Zhao, Baowei Liu, Bin Zhang e Zhiguo Gui. "Research on Target Deviation Measurement of Projectile Based on Shadow Imaging Method in Laser Screen Velocity Measuring System". Sensors 20, n. 2 (19 gennaio 2020): 554. http://dx.doi.org/10.3390/s20020554.
Testo completoAbstract (sommario):
In the laser screen velocity measuring (LSVM) system, there is a deviation in the consistency of the optoelectronic response between the start light screen and the stop light screen. When the projectile passes through the light screen, the projectile’s over-target position, at which the timing pulse of the LSVM system is triggered, deviates from the actual position of the light screen (i.e., the target deviation). Therefore, it brings errors to the measurement of the projectile’s velocity, which has become a bottleneck, affecting the construction of a higher precision optoelectronic velocity measuring system. To solve this problem, this paper proposes a method based on high-speed shadow imaging to measure the projectile’s target deviation, ΔS, when the LSVM system triggers the timing pulse. The infrared pulse laser is collimated by the combination of the aspherical lens to form a parallel laser source that is used as the light source of the system. When the projectile passes through the light screen, the projectile’s over-target signal is processed by the specially designed trigger circuit. It uses the rising and falling edges of this signal to trigger the camera and pulsed laser source, respectively, to ensure that the projectile’s over-target image is adequately exposed. By capturing the images of the light screen of the LSVM system and the over-target projectile separately, this method of image edge detection was used to calculate the target deviation, and this value was used to correct the target distance of the LSVM to improve the accuracy of the measurement of the projectile’s velocity.
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Medina-Mirapeix, Francesc, Rodrigo Martín-San Agustín, Germán Cánovas-Ambit, José A. García-Vidal, Mariano Gacto-Sánchez e Pilar Escolar-Reina. "An Optoelectronic System for Measuring the Range of Motion in Healthy Volunteers: A Cross-Sectional Study". Medicina 55, n. 9 (22 agosto 2019): 516. http://dx.doi.org/10.3390/medicina55090516.
Testo completoAbstract (sommario):
Background and Objectives: Within the clinical evaluation of multiple pathologies of the lower limb, the measurement of range of motion (ROM) of its joints is fundamental. To this end, there are various tools, from the goniometer as a reference to more recent devices such as inclinometry-based applications, photo capture applications, or motion capture systems. This study aimed to assess the validity, intra-rater, and inter-rater reliability of the VeloFlex system (VS), which is a new camera-based tool designed for tracking joint trajectories and measuring joint ROM. Materials and Methods: Thirty-five healthy volunteers (16 females; aged 18–61 years) participated in this study. All participants were assessed on two separate occasions, one week apart. During the first assessment session, measurements were obtained using a goniometer and the VS, whereas, in the second session, only the VS was used. In each assessment session, nine active movements were examined. For each movement, three trials were tested, and the mean of these three measures was used for analysis. To evaluate the concurrent validity and agreement, the Pearson correlation coefficient (r) and Bland-Altmann plots were used. Intra-rater and inter-rater reliability were evaluated using intra-class correlation (ICC), standard error of measurement (SEM), and minimal detectable change (MDC). Results: Both devices showed excellent correlations for all movements (r ranged from 0.992 to 0.999). The intra-rater reliability of the VS was excellent (ICC ranged from 0.93 to 0.99), SEMs ranged from 0.53% to 2.61% and the MDC ranged from 0.68° to 3.26°. The inter-rater reliability of the VS was also excellent (ICC ranged from 0.88 to 0.98), SEMs ranged from 0.81% to 4.76% and the MDC ranged from 2.27° to 4.42°. Conclusions: The VS is a valid and reliable tool for the measurement of ROM of lower limb joints in healthy subjects.
20
Li, Yi, Zhong Guo e Bao Chun Chen. "Application of Optoelectronic Liquid Lever Sensor in Urban Bridges Deflection Monitoring". Applied Mechanics and Materials 198-199 (settembre 2012): 1184–89. http://dx.doi.org/10.4028/www.scientific.net/amm.198-199.1184.
Testo completoAbstract (sommario):
The deflection which reflects the bridge linear variety is an important parameter for the evaluation of bridge safety. According to the structural characteristics of urban bridges, the connected pipe optoelectronic liquid level sensor system is a novel kind of sensor for detecting the connected pipe liquid level, which can be applied for multipoint, long-period, online, remote, automatic measurement of bridge deflection, it is not affected by the dust, humidity and fog in the urban bridge health monitoring and maintenance. At present, the system has been integrated and applied in the project of main roads bridge Online Safety Monitoring Management System in Hangzhou (Phase II), a web-based urban bridge cluster monitoring system have been established since 2007. According to a tied arch bridge case studies, the measuring data show that the system not only can accurately collect the bridge normal deflection information and variety, but also successfully monitored the structural responses due to the Wenchuan earthquake on May 12, 2008. About two-minute abrupt changes in displacement amplitude were observed in the measured signals starting at 14:37, about 9 minutes later than the earthquake’s occurring. The results shows, it is an effective method for the real-time monitoring of urban bridge deflection.
21
Kalikin, Vadim E., Alexander G. Verkhogliad, Stepan V. Kalichkin, Sergei N. Makarov, Vladimir S. Bazin, Vladimir B. Kharhota e Sergei G. Savkov. "Automatic High-Speed Optoelectronic System for Dimensional Inspection of Distant Articles in Industry and Transport". Key Engineering Materials 437 (maggio 2010): 429–33. http://dx.doi.org/10.4028/www.scientific.net/kem.437.429.
Testo completoAbstract (sommario):
Advanced automated optoelectronic system for contact wire wear inspection on the go using a structured light method is presented. The algorithm of the video stream analysis and approaches to its implementation using high-performance electronic equipment are given. The automated system described has allowed measuring wear parameters with 10 mm interval at the inspection wagon velocity of 60 km per hour. The root-mean-square error for the measurements of the remaining height and contact plot constitutes 0.15 and 1.5 mm2 correspondently that allows one to make a considered decision about changing a worn section of a contact wire network. The system also can be utilized to inspect public transportation network and to measure the geometric parameters of cables and tubes being fabricated with rolling technique.
22
Chang, Chung-Ping, Tsung-Chun Tu, Siang-Ruei Huang, Yung-Cheng Wang e Syuan-Cheng Chang. "Development of the Heterodyne Laser Encoder System for the X–Y Positioning Stage". Sensors 21, n. 17 (27 agosto 2021): 5775. http://dx.doi.org/10.3390/s21175775.
Testo completoAbstract (sommario):
This investigation develops a laser encoder system based on a heterodyne laser interferometer. For eliminating geometric errors, the optical structure of the proposed encoder system was carried out with the internal zero-point method. The designed structure can eliminate the geometric errors, including positioning error, straightness error, squareness error, and Abbe error of the positioning stage. The signal processing system is composed of commercial integrated circuits (ICs). The signal type of the proposed encoding system is a differential signal that is compatible with most motion control systems. The proposed encoder system is embedded in a two-dimensional positioning stage. By the experimental results of the positioning test in the measuring range of 27 mm × 27 mm, with a resolution of 15.8 nm, the maximum values of the positioning error and standard deviation are 12.64 nm and 126.4 nm, respectively, in the positioning experiments. The result shows that the proposed encoder system can fit the positioning requirements of the optoelectronic and semiconductor industries.
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Aviev, A. A., e V. N. Enin. "Optical field amplitude distribution on the pattern plate of optoelectronic system for measuring of dither system parameters in ring laser gyro". Scientific and Technical Journal of Information Technologies, Mechanics and Optics 18, n. 2 (1 marzo 2018): 197–204. http://dx.doi.org/10.17586/2226-1494-2018-18-2-197-204.
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Malik, T., Ya Bryk, V. Zatserkovnyi e V. Belenok. "EVALUATION OF ENGINEERING STRUCTURES DEFORMATION (ACCURACY)". Visnyk of Taras Shevchenko National University of Kyiv. Geology, n. 1 (84) (2019): 77–82. http://dx.doi.org/10.17721/1728-2713.84.11.
Testo completoAbstract (sommario):
The construction of the model of accuracy of the measuring processes of the automated monitoring system of engineering structures deformations from the point of the theory of accuracy is considered in the article. From the point of view of the generalization of the accuracy of measurements by the automated system of engineering structures monitoring, the construction of the model of the measuring process is considered, resulting in separate characteristics and properties of the object to be investigated. In this case these are values of deformations of engineering constructions' structures. The brief acquaintance with the automated system of monitoring of engineering structures deformations, which represents a chain of optoelectronic devices-deformation marks, which are installed on constructions of structures and fix the created line is given. The use of this system allows to solve the problem of the preventive assessment of the dynamics of local technogenic deformation in the engineering structure and thus to increase the level of technogenic safety of the personnel of the engineering structure. Compared with modern well-known methods and means for determining the engineering structures deformation, an automated deformation monitoring system has the following advantages: 1. Cross-section geodetic control of deformations (position) of elements of the full volume of engineering structure with increased accuracy. 2. Automated control of engineering structures deformations in real time, including in limited or inaccessible for visual measurements places. 3. Control of the technogenic safety of the engineering structure, prediction of the moment of the emergency, warning about the upcoming critical state (moment) of the engineering structure in real time with the accurate definition of a certain area. 4. Installation of the entire monitoring system occurs during the construction of the structure, pre-installation sites of optoelectronic devices - deformation marks are agreed with the designers and architects. 5. The mean square error of measurement of relative deviations of deformations is not less than 0,1-0,5 mm at distances between optoelectronic devices up to 10 m. 6. Information on the magnitude of deviations from the nominal (initial) position goes to the remote central control panel of the system in real time scale. 7. In the case of upcoming moment of dangerous deviation (deformation), the command from the main control panel receives a signal for rapid response with the accurate designation of the place of dangerous deformation.
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Aviev, A. A., e V. N. Enin. "Dynamic model of an optoelectronic system for measuring the parameters of a vibration support in a laser gyroscope". Izvestiâ vysših učebnyh zavedenij. Priborostroenie 64, n. 4 (12 maggio 2021): 276–87. http://dx.doi.org/10.17586/0021-3454-2021-64-4-276-287.
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Meric, Henri, Frédéric Lofaso, Line Falaize e Didier Pradon. "Comparison of Two Methods to Compute Respiratory Volumes Using Optoelectronic Plethysmography". Journal of Applied Biomechanics 32, n. 2 (aprile 2016): 221–26. http://dx.doi.org/10.1123/jab.2015-0116.
Testo completoAbstract (sommario):
Plethysmography is an indispensable component of clinical lung function testing. However, lung volume measurement in the supine position using an optoelectronic system requires the placement of reflective markers on the anterior and lateral torso surface. The conventional method computes breath-by-breath changes in the volume between the markers and the bed, which serves as the reference plane. In contrast, the surface method consists of measuring the volume delineated by the surface area of the marker network at the onset and end of inspiration. We compared these 2 methods to spirometry during spontaneous breathing in 11 healthy volunteers and in 14 patients receiving routine visits for neuromuscular disease. Bland-Altman plots showed that agreement with spirometry was better for the surface method that the conventional method. Our results open up prospects for integrating these methods in the development of new devices.
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Charoensopa, Krairop, Aran Hansuebsai e Kazuhiro Manseki. "3D Printed Titanium Dioxide Thin Films for Optoelectronic Applications". Key Engineering Materials 843 (maggio 2020): 79–83. http://dx.doi.org/10.4028/www.scientific.net/kem.843.79.
Testo completoAbstract (sommario):
This work focused on the printing of semiconductor TiO2 thin films for solar cell applications by 3D printing system. We demonstrate a Liquid Deposition Modeling (LDM) type for controlling the pattern of TiO2 electrode. The advantage of this type of printer is able to vary the numbers of printed layer as well as different levelling pattern of TiO2 thin films by one time operation. Our aim was to study the effects of operating parameters of the 3D printer, such as nozzle size, speed and pressure on the thickness and uniformity of the printed TiO2 films. Using a commercial TiO2 paste, TiO2 precursor films were deposited on a conductive F-doped SnO2 glass by adjusting nozzle size, speed and pressure. The precursor films with different printed layers and levelling pattern were sintered using oven to produce porous TiO2 electrodes. The thickness and surface roughness of obtained TiO2 electrodes were characterized using Scanning Electron Microscope (SEM) and 3D Measuring Laser Microscope. The printed TiO2 substrates were applied to dye-sensitized solar cells as electrodes. Our LDM type 3D printing will provide a new way of levelling design of device components for versatile optoelectronic applications.
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Nguyen, Son, Z. Joan Delalic, David M. Kargbo, Joel B. Sheffield e Zameer Hasan. "Hardware Design for Multiple Gas Detection System Using Zeolite Coated with Nile Red". International Symposium on Microelectronics 2011, n. 1 (1 gennaio 2011): 000861–67. http://dx.doi.org/10.4071/isom-2011-wp6-posterpapers-paper4.
Testo completoAbstract (sommario):
The goal of this research is to develop a nanosensor that integrates a zeolite/dye sensing unit with an optoelectronic detector, fully integrated into a portable gas sensor. The device will detect and measure more than one target gas at the same time. Since nanoporous structures of zeolites are manipulated, the device is expected to be more accurate, more sensitive, is able to better differentiate and detect any one target in a mixture of different gases. This is achieved by incorporating fluorescent dyes into the zeolites’ cavities, measuring gas absorption, desorption and photo-chromic interaction of dye and gases, interfacing the zeolite/dye sensor arrays with light source and electronic detectors. The electronic part of the device is fully customized VLSI chip. The final device will be packaged into a portable unit. The designed and packaged prototype will be presented.
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Neelamegam, Periyaswmy, Abdul Sheriff Jamaludeen, Annamalai Ragendran e Krishanamoorthy Murugrananthan. "Microcontroller-Based System for Estimate of Calcium in Serum Samples". Biomedical Instrumentation & Technology 44, n. 5 (1 settembre 2010): 433–39. http://dx.doi.org/10.2345/0899-8205-44.5.433.
Testo completoAbstract (sommario):
Abstract In this study, a microcontroller-based control unit was designed and constructed for the estimation of serum calcium in blood samples. The proposed optoelectronic instrument used a red light emitting diode (LED) as a light source and photodiode as a sensor. The performance of the system was compared with that of a commercial instrument in measuring calcium ion. The quantitative analysis of calcium in a catalyst using arsenazo III as colorimetric reagent was used to test the device. The calibration curve for calcium binding with arsenazo III was drawn to check the range of linearity, which was between 0.1 to 4.5 mM L−1. The limit of detection (LOD) is 0.05 mM L−1. Absorbance changes over the pH range of 2–12 were determined to optimize the assay, with maximum absorption at pH 9.0. Interferences in absorbance from monovalent (K+ and Na+) and divalent (Mg2+) cations were also studied. The results show that the system works successfully.
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Thorwartl, Christoph, Thomas Stöggl, Wolfgang Teufl, Helmut Holzer e Josef Kröll. "Curvature Detection with an Optoelectronic Measurement System Using a Self-Made Calibration Profile". Sensors 22, n. 1 (22 dicembre 2021): 51. http://dx.doi.org/10.3390/s22010051.
Testo completoAbstract (sommario):
So far, no studies of material deformations (e.g., bending of sports equipment) have been performed to measure the curvature (w″) using an optoelectronic measurement system OMS. To test the accuracy of the w″ measurement with an OMS (Qualisys), a calibration profile which allowed to: (i) differentiates between three w″ (0.13˙ m−1, 0.2 m−1, and 0.4 m−1) and (ii) to explore the influence of the chosen infrared marker distances (50 mm, 110 mm, and 170 mm) was used. The profile was moved three-dimensional at three different mean velocities (vzero = 0 ms−1, vslow = 0.2 ms−1, vfast = 0.4 ms−1) by an industrial robot. For the accuracy assessment, the average difference between the known w″ of the calibration profile and the detected w″ from the OMS system, the associated standard deviation (SD) and the measuring point with the largest difference compared to the defined w″ (=maximum error) were calculated. It was demonstrated that no valid w″ can be measured at marker distances of 50 mm and only to a limited extent at 110 mm. For the 170 mm marker distance, the average difference (±SD) between defined and detected w″ was less than 1.1 ± 0.1 mm−1 in the static and not greater than −3.8 ± 13.1 mm−1 in the dynamic situations. The maximum error in the static situation was small (4.0 mm−1), while in the dynamic situations there were single interfering peaks causing the maximum error to be larger (−30.2 mm−1 at a known w″ of 0.4 m−1). However, the Qualisys system measures sufficiently accurately to detect curvatures up to 0.13˙ m−1 at a marker distance of 170 mm, but signal fluctuations due to marker overlapping can occur depending on the direction of movement of the robot arm, which have to be taken into account.
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Čimo, Ján, e Bernard Šiška. "DESIGN AND REALIZATION OF MONITORING SYSTEM FOR MEASURING AIR TEMPERATURE AND HUMIDITY, WIND DIRECTION AND SPEED". JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 14, n. 3 (30 settembre 2006): 127–34. http://dx.doi.org/10.3846/16486897.2006.9636889.
Testo completoAbstract (sommario):
An air humidity sensor based on the capacity principle and programmable digital air temperature sensors are designed in the work. The wind direction and wind speed sensor (anemometer) is based on the optoelectronic principle. Sensors register frequency impulses from the wind fan of the anemometer. Methods and materials conformable with modern electronics and informatics were used. The method of linear regression was used for calibration of sensors. The accuracy of an air temperature sensor was found better than 0,1 °C in the range from ‐55 to 125 °C, and an air humidity sensor was better than 1 % in the range from 0 to 98 %. The anemometer works in the range of wind velocity from 0 to 150 km.h−1 with accuracy better than 1 % to 90 km.h−1 and over 90 km/h better than 3 %. First of all these sensors were proposed for automatic weather stations widely used in the sector of agriculture (microclimatic weather stations), industry and for other technological operations where monitoring of temperature, wind speed, wind direction and humidity is required. The sensors will be used as models for educational purposes at the lessons of biometeorology and climatology too.
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Nguyen, Son, Z. Joan Delalic, David M. Kargbo e Joel B. Sheffield. "Hardware Design for Multiple Gas Detection System Using Zeolite Coated with Nile Red". International Symposium on Microelectronics 2012, n. 1 (1 gennaio 2012): 001185–90. http://dx.doi.org/10.4071/isom-2012-thp53.
Testo completoAbstract (sommario):
The research goal is to develop a multiple gas sensing device which integrates a zeolite-Y/nile-red sensing front end with optoelectronic detector. The highly fluorescent nile red dye, included in the nanoporous structures of zeolite Y, responses to different gases by emitting fluorescence of different wavelengths. In addition, the size of the pores of zeolite Y's can be utilized to allow gases whose molecule is smaller than the pores to enter and react with the included dye. Since nanoporous structures of zeolites are manipulated, the device is expected to be more accurate, and more sensitive. Also it is able to better differentiate and detect one target in a mixture of different gases. This is achieved by incorporating fluorescent dyes into the supercages of zeolite Y's, measuring gas absorption, desorption and photo-chromic interaction of dye and gases, interfacing the zeolite/dye sensor arrays with light source and electronic detectors.
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Akilin, Gleb A., Vladimir А. Fedorov, Evgeny V. Gritskevich e Polina A. Zviagintseva. "COORDINATOR SIMULATION COMPUTER MODEL WORKING AS APART OF BIOMETRIC RECOGNITION SYSTEM". Interexpo GEO-Siberia 6, n. 1 (8 luglio 2020): 11–21. http://dx.doi.org/10.33764/2618-981x-2020-6-1-11-21.
Testo completoAbstract (sommario):
Simulation computer model of an optoelectronic coordinate measurer for point objects is considered that is a part of the subject recognition system based on biometric features. The presented model allows you to virtually explore and analyze the processes of functioning of the coordinator, which ensures optimal coordination of parameters and characteristics of various parts of the device, as well as to choose the most effective algorithm for processing the resulting digital image by minimizing the error of measuring the coordinates of a single point object. The simulation is based on the Monte Carlo method of multiple statistical tests, which provides most accurate representation of noise processes that occur when receiving and converting optical information in the optical-electronic path of a coordinate device, since these processes, under solid equal conditions, make a decisive contribution to the final measurement error. The principles of the model are described and the results obtained are discussed, as well as the future development of the model and its application for solving problems of optimal system design of biometric recognition systems.
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Adnastarontsau, A. A., D. A. Adnastarontsava, R. V. Fiodortsev, D. V. Katser, A. Y. Liavonau, D. V. Romanov, D. N. Tcherniakovski e A. О. Mikhailau. "Algorithm for Control of Unmanned Aerial Vehicles in the Process of Visual Tracking of Objects with a Variable Movement’s Trajectory". Devices and Methods of Measurements 12, n. 1 (19 marzo 2021): 46–57. http://dx.doi.org/10.21122/2220-9506-2021-12-1-46-57.
Testo completoAbstract (sommario):
The purpose of the research was to create an algorithm for determining and correcting the output parameters of the navigation module and the flight-navigation complex of unmanned aerial vehicles which provides control of an aviation gyro-stabilized platform with a multispectral optoelectronic system during flight and tracking various objects of observation.Principles of control of an aviation technical vision system located on an unmanned aerial vehicle on a two-degree gyro-stabilized platform with the possibility of full turn around two perpendicular axes along the course and pitch are considered. Stability of tracking of observation objects at a distance of up to 10000 m is ensured by the use of a multispectral optoelectronic system including a rangefinder, thermal imaging and two visual channels.Analysis of the object of observation and the method of its support are carried out. An algorithm is proposed for integrating a Global Navigation Satellite System and a strapdown inertial navigation system based on the extended Kalman filter which includes two stages of calculations, extrapolation (prediction) and correction. Specialized software in the FreeRTOS v9.0 environment has been developed to obtain a navigation solution: latitude, longitude and altitude of the unmanned aerial vehicle in the WGS-84 coordinate system, as well as the pitch, heading and roll angles; north, east and vertical components of velocities in the navigation coordinate system; longitudinal, vertical and transverse components of free accelerations and angular velocities in the associated coordinate system based on data from the receiving and measuring module of the Global Navigation Satellite System and data from the 6-axis MEMS sensor STIM300.
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Domanskyi, I. V., e V. O. Vasenko. "Improvement of Video Measuring Systems for Electric Traction Network Diagnostics". Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, n. 1(91) (15 febbraio 2021): 73–83. http://dx.doi.org/10.15802/stp2021/230232.
Testo completoAbstract (sommario):
Purpose. The purpose of the article is system analysis of the state of electric traction networks, as well as methods of complex diagnostics of the contact network from a moving laboratory car to increase the resolution capability of the systems for monitoring the quality of interaction between the contact network and current collectors. Methodology. The problem was solved by theoretical analysis and experimental studies of the current collection parameters, a generalized model of the device for monitoring the wear of the overhead wire and its functional units in order to determine the factors affecting the control error, as well as the development of methods that reduce the specified error. The apparatus of factor analysis, the theory of optoelectronic circuits and methods of statistical information processing were used. Findings. Innovative approaches and qualitatively new diagnostic tools are proposed that allow expanding the functionality of the laboratory cars for testing the contact network for power supply enterprises of electrified railways, industrial and urban electric transport. Hardware and software have been developed to improve the system for measuring the parameters of the overhead wire and other components of the contact network. Originality. The theoretical maximum permissible, from the point of view of the contact network operation, error in monitoring the wear of the overhead wire and other components of the electric traction network has been determined. A method for increasing the resolution capability of a stereo television system and an adaptive lighting system is proposed. It consists in preliminary image transformation and expansion of the dynamic range of image measurement. The ways of introducing a high-speed real-time compression algorithm and using LED backlighting are proposed. Practical value. The quality of the contact network diagnostics in difficult conditions for video surveillance has been improved. A camera with a built-in image compression module without losing its performance is proposed, which allows capturing and transmitting full-frame images to a computing complex for the application of new diagnostic algorithms for contact network components. The modernized video measuring systems for the wear of the overhead wire for monitoring the grounding of the contact network supports are proposed, as well as elements of track facilities located in the visibility zone of specialized cameras, which ensure the operability of the systems at any time of the day at speeds up to 160 km/h. An air curtain subsystem was implemented to protect the cameras.
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Dieltiens, Sien, Kurt Claeys, Jordi D’hondt, Henri Devroey, Marc Juwet e Eric Demeester. "Validation of a Bar Linkage Model for Joint Angle Estimation during Cycling". Applied Sciences 10, n. 15 (24 luglio 2020): 5104. http://dx.doi.org/10.3390/app10155104.
Testo completoAbstract (sommario):
Measuring lower extremity joint angles during cycling is interesting to derive joint loading from contact forces at the pedals and to determine the cause of cycling injuries. Traditionally, joint angles are determined in a stationary setup with high-resolution cameras that track marker movement in a lab environment. Alternatively, joint angles can be estimated mathematically in-situ: the lower extremities, bicycle frame and pedal arms are presented as a 5 bar linkage system which is fully defined by the lower extremity segment lengths, seat height and pedal position. As most instrumented pedals for power measurements include pedal orientation measurements, the bar linkage system demands no special equipment to derive joint loadings from pedal loads. The aim of this study is to validate the bar linkage system for joint angle estimation in the sagittal plane during in-situ cycling. Ten subjects cycled on a stationary bike while the hip, knee and ankle angles were measured with a Vicon optoelectronic motion capture system and simultaneously calculated with the bar linkage system. The results were averaged to subject-specific and method-specific ensemble average curves in the function of the phase in the pedal cycle and compared by a correlation analysis, Bland Altman plot, and Spm1D paired T-test. The hip and knee angle estimation of the bar linkage system showed no statistically significant difference from the optoelectronic system. Moreover, the ankle showed a statistically significant difference in the last half of the recovery phase of the pedal cycle. As the difference was maximally 3°, it has no clinical significance when deriving joint loading from contact forces at the pedal.
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Czernek, Krystian, e Stanisław Witczak. "Precise Determination of Liquid Layer Thickness with Downward Annular Two-Phase Gas-Very Viscous Liquid Flow". Energies 13, n. 24 (10 dicembre 2020): 6529. http://dx.doi.org/10.3390/en13246529.
Testo completoAbstract (sommario):
The paper presents the characteristics of the original optoelectronic system for measuring the values of hydrodynamics of two-phase downward gas-very viscous liquid flow. The measurement methods and results of the research on selected values describing gas–oil two-phase flow are presented. The study was conducted in vertical pipes with diameters of 12.5, 16, 22, and 54 mm. The research was conducted with the superficial velocities of air jg = 0–29.9 m/s and oil jl = 0–0.254 m/s, which corresponded to the values of gas stream density gg = (0–37.31) kg/(m2s) and of liquid gl = (0.61–226.87) kg/(m2s), in order to determine the influence of air and oil streams on the character of liquid films. The variations in oil viscosity were applied in the range ηl = (0.055–1.517) Pas. The study results that were obtained with optical probes along with computer image analysis system revealed vast research opportunities in terms of the identification of gas–liquid two-phase downward flow structures that were generated as well as the determination of the thickness of liquid film with various level of interfacial surface area undulation. The designed and constructed proprietary measuring system is also useful for testing the liquid layer by determining the parameters of the resulting waves. It is considered that the apparatus system that is presented in the article is the most effective in examining the properties of liquid layers of oil and other liquids with low electrical conductivity and a significant degree of monochromatic light absorption. In view of noninvasive technique of measuring characteristic values of liquid films being formed, the above measuring system is believed to be very useful for industry in the diagnostics of the apparatus employing such flows.
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Pomerantsev, Andrey A., Alexander N. Starkin e Elena V. Chervyakova. "Assessing the integral health indicator of schoolchildren on the basis of innovative technologies". Perspectives of Science and Education 54, n. 6 (31 dicembre 2021): 257–70. http://dx.doi.org/10.32744/pse.2021.6.17.
Testo completoAbstract (sommario):
Introduction. The health of schoolchildren is the foundation for the educational process and the key to success in future work activities. The current level of development of technology and information technology allows you to bring health monitoring to a new, higher quality level. Purpose of the study: on the basis of a comparison of various historically established approaches to assessing the health of schoolchildren, to identify the main development trends and promising technologies suitable for determining the integral indicator of the health of schoolchildren. Research methodology and techniques. The research is theoretical. To search for information about innovative technologies, we analyzed scientific articles in Russian and English, taken from scientometric databases. As a result, we selected 14 technologies that were more consistent with the requirements of minimum time consumption, distance and invasiveness. Results. Technologies used in biomechanics, medicine, forensic science, navigation together can make it possible to comprehensively assess the psychological, neurodynamic, motor and energy components of schoolchildren's health. The most promising systems for assessing the health of schoolchildren are the following systems: an image processing system (technology for detecting and recognizing faces, technology for recognizing facial expressions and gestures), an optoelectronic measuring system (motion capture technology), an internal thermometry system (acoustothermometry), a navigation system, an electromagnetic measuring system, system of content analysis of Internet traffic, strain-dynamometric system, as well as neurotechnological system. The proposed approach requires significant information resources for the accumulation and automated processing of large amounts of information in a single analytical centre. The use of artificial intelligence algorithms will allow detecting hidden relationships of health indicators, assessing risks and giving personalized recommendations. On the basis of the information collected, it is planned to create an electronic passport of schoolchildren's health with further integration of this module into the domestic educational complex of an electronic student's diary.
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Cysewska-Sobusiak, Anna Romana. "Examples of acquisition and application of biooptical signals". Photonics Letters of Poland 11, n. 2 (1 luglio 2019): 25. http://dx.doi.org/10.4302/plp.v11i2.897.
Testo completoAbstract (sommario):
Scientific activity of Division of Metrology and Optoelectronics with Poznan University of Poland (PUT) includes methods and systems used in modern electronic, optoelectronic, and biomedical metrology. Noninvasive diagnostic methods applied in medical engineering, with special interest in optoelectronic sensor technology and advanced methods of imaging, are considered in the paper. The author who was the Head of the Division presents the short review of some selected former results of studies related to biophotonics. Full Text: PDF ReferencesA. Cysewska-Sobusiak, "Powers and Limitations of Noninvasive Measurements Implemented in Pulse Oximetry", Biocybernetics and Biomedical Engineering 22 (2002). DirectLink J.G. Webster, Design of pulse oximeters (Bristol, IOP Publishing Ltd 1997). CrossRef T. Aoyagi, "Pulse oximetry: its invention, theory, and future", Journal of Anesthesia 17, 4 (2003). CrossRef A.A. Alian and K.H Shelley, "Photoplethysmography", Anesthesiology 28, 4 (2014). CrossRef F.A. Duck, Physical properties of tissue: a comprehensive reference book (San Diego, Academia Press 1990). CrossRef Z. Krawiecki, A. Cysewska-Sobusiak, G. Wiczyński, and A. Odon, "Modeling and measurements of light transmission through human tissues", Bull. Pol. Ac. Tech. 56, 2 (2008). DirectLink A. Cysewska-Sobusiak, "One-dimensional representation of light-tissue interaction for application in noninvasive oximetry", Opt. Eng. 36, 4 (1997). CrossRef D. Prokop, A. Cysewska-Sobusiak, and A. Hulewicz, "Monitoring of the Arterial Blood Waveforms with a Multi-Sensor System", Procedia Eng. 47 (2012). CrossRef A. Cysewska-Sobusiak, P. Skrzywanek, and A. Sowier, "Utilization of Miniprobes in Modern Endoscopic Ultrasonography", IEEE Sensors Journal 6, 5 (2006). CrossRef A. Cysewska-Sobusiak, G. Wiczyński, Z. Krawiecki, and A. Sowier, "Role of optical techniques in combined use of selected methods of medical imaging", Opto-Electron. Rev. 16, 2 (2008). CrossRef A. Cysewska-Sobusiak, M. Bołtrukiewicz, and J. Parzych, "Evaluation of fluorescence images acquired from oligonucleotide libraries", Optica Applicata 38, 2 (2008). DirectLink M. Jukiewicz and A. Cysewska-Sobusiak, "Stimuli design for SSVEP-based brain computer-interface", Intl. Journal of Electronics and Telecommunications 62, 2 (2016). CrossRef G. Wiczyński, "Inaccuracy of Short-Term Light Flicker Pst Indicator Measuring With a Flickermeter", IEEE Trans. on Power Delivery, 27, 2 (2012). CrossRef A. Hulewicz, "A New Approach to Objective Evaluation of Human Visual Acuity", Phot. Lett. Poland 6, 4 (2014). CrossRef A. Zielińska, K. Kiluk, M. Wojtkowski, and K. Komar, "System for psychophysical measurements of two-photon vision", Phot. Lett. Poland 11, 1 (2019). CrossRef
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Tamantini, Christian, Francesca Cordella, Clemente Lauretti e Loredana Zollo. "The WGD—A Dataset of Assembly Line Working Gestures for Ergonomic Analysis and Work-Related Injuries Prevention". Sensors 21, n. 22 (16 novembre 2021): 7600. http://dx.doi.org/10.3390/s21227600.
Testo completoAbstract (sommario):
This paper wants to stress the importance of human movement monitoring to prevent musculoskeletal disorders by proposing the WGD—Working Gesture Dataset, a publicly available dataset of assembly line working gestures that aims to be used for worker’s kinematic analysis. It contains kinematic data acquired from healthy subjects performing assembly line working activities using an optoelectronic motion capture system. The acquired data were used to extract quantitative indicators to assess how the working tasks were performed and to detect useful information to estimate the exposure to the factors that may contribute to the onset of musculoskeletal disorders. The obtained results demonstrate that the proposed indicators can be exploited to early detect incorrect gestures and postures and, consequently to prevent work-related disorders. The approach is general and independent on the adopted motion analysis system. It wants to provide indications for safely performing working activities. For example, the proposed WGD can also be used to evaluate the kinematics of workers in real working environments thanks to the adoption of unobtrusive measuring systems, such as wearable sensors through the extracted indicators and thresholds.
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Salvatori, Stefano, Sara Pettinato, Armando Piccardi, Vadim Sedov, Alexey Voronin e Victor Ralchenko. "Thin Diamond Film on Silicon Substrates for Pressure Sensor Fabrication". Materials 13, n. 17 (21 agosto 2020): 3697. http://dx.doi.org/10.3390/ma13173697.
Testo completoAbstract (sommario):
Thin polycrystalline diamond films chemically vapor deposited on thinned silicon substrates were used as membranes for pressure sensor fabrication by means of selective chemical etching of silicon. The sensing element is based on a simple low-finesse Fabry–Pérot (FP) interferometer. The FP cavity is defined by the end-face of a single mode fiber and the diamond diaphragm surface. Hence, pressure is evaluated by measuring the cavity length by an optoelectronic system coupled to the single mode fiber. Exploiting the excellent properties of Chemical Vapor Deposition (CVD) diamond, in terms of high hardness, low thermal expansion, and ultra-high thermal conductivity, the realized sensors have been characterized up to 16.5 MPa at room temperature. Preliminary characterizations demonstrate the feasibility of such diamond-on-Si membrane structure for pressure transduction. The proposed sensing system represents a valid alternative to conventional solutions, overcoming the drawback related to electromagnetic interference on the acquired weak signals generated by standard piezoelectric sensors.
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Büttner, Christin, Thomas L. Milani e Freddy Sichting. "Integrating a Potentiometer into a Knee Brace Shows High Potential for Continuous Knee Motion Monitoring". Sensors 21, n. 6 (19 marzo 2021): 2150. http://dx.doi.org/10.3390/s21062150.
Testo completoAbstract (sommario):
Continuous monitoring of knee motion can provide deep insights into patients’ rehabilitation status after knee injury and help to better identify their individual therapeutic needs. Potentiometers have been identified as one possible sensor type for continuous monitoring of knee motion. However, to verify their use in monitoring real-life environments, further research is needed. We aimed to validate a potentiometer-embedded knee brace to measure sagittal knee kinematics during various daily activities, as well as to assess its potential to continuously monitor knee motion. To this end, the sagittal knee motion of 32 healthy subjects was recorded simultaneously by an instrumented knee brace and an optoelectronic reference system during activities of daily living to assess the agreement between these two measurement systems. To evaluate the potentiometer’s behavior during continuous monitoring, knee motion was continuously recorded in a subgroup (n = 9) who wore the knee brace over the course of a day. Our results show a strong agreement between the instrumented knee brace and reference system across all investigated activities as well as stable sensor behavior during continuous tracking. The presented potentiometer-based sensor system demonstrates strong potential as a device for measuring sagittal knee motion during daily activities as well as for continuous knee motion monitoring.
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Barreto, Joana, César Peixoto, Sílvia Cabral, Andrew Mark Williams, Filipe Casanova, Bruno Pedro e António P. Veloso. "Concurrent Validation of 3D Joint Angles during Gymnastics Techniques Using Inertial Measurement Units". Electronics 10, n. 11 (24 maggio 2021): 1251. http://dx.doi.org/10.3390/electronics10111251.
Testo completoAbstract (sommario):
There are advantages in using inertial measurement unit systems (IMUS) for biomechanical analysis when compared to 2D/3D video-based analysis. The main advantage is the ability to analyze movement in the natural performance environment, preserving the ecological validity of the task. Coaches can access accurate and detailed data in real time and use it to optimize feedback and performance. Efforts are needed to validate the accuracy of IMUS. We assess the accuracy of the IMUS Xsens MVN Link system using an optoelectronic system (OS) as a reference when measuring 3D joint angles during the gymnastics round-off back handspring technique. We collected movement kinematics from 10 participants. The coefficient of multiple correlation (CMC) results showed very good and excellent values for the majority of the joint angles, except for neck flexion/extension (F/E). Root mean square errors (RMSE) were below/near 10°, with slightly higher values for shoulder (12.571°), ankle (11.068°), thorax-thigh F/E (21.416°), and thorax–thigh internal/external rotation (I/E) (16.312°). Significant SPM-1D {t} differences for thorax–thigh abduction/adduction (A/A), neck, thorax–thigh, knee, shoulder and ankle F/E were demonstrated during small temporal periods. Our findings suggest that the Xsens MVN Link system provides valid data that can be used to provide feedback in training.
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Martín-San Agustín, Rodrigo, Jose A. García-Vidal, German Cánovas-Ambit, Aurelio Arenas-Della Vecchia, Manuel López-Nicolás e Francesc Medina-Mirapeix. "Validity and Reliability of a New Optoelectronic System for Measuring Active Range of Motion of Upper Limb Joints in Asymptomatic and Symptomatic Subjects". Journal of Clinical Medicine 8, n. 11 (2 novembre 2019): 1851. http://dx.doi.org/10.3390/jcm8111851.
Testo completoAbstract (sommario):
The aim of this study was to evaluate the validity of the Veloflex infrared dynamic angle-meter (Veloflex-IDA) and the intra- and inter-rater reliability when measuring the ranges of motion (ROMs) of the upper limb joints. Thirty-five healthy and 20 symptomatic participants were evaluated. Twelve upper limb movements were measured in two sessions with the Veloflex-IDA, which is a device composed of a camera that tracks the trajectory of retro-reflective markers. In addition, a goniometer was used in the first session to evaluate concurrent validity. Validity and agreement were evaluated by Pearson correlation coefficient (r) and Bland–Altmann plots. Intra- and inter-rater reliability were evaluated using intra-class correlation (ICC), standard error of measurement (SEM), and minimal detectable change (MDC). Both instruments showed excellent correlation for all movements (r range from 0.992 to 0.999). The intra- and inter-rater reliability were excellent (ICC range from 0.95 to 0.99 and 0.90 to 0.98, respectively). Intra-rater reliability showed SEMs <1.38% and <5.19% and inter-rater reliability SEMs <2.26% and <5.22% for asymptomatic and symptomatic, respectively. Veloflex-IDA is a valid and reliable alternative to measure the upper limb joints’ ROM and it can be used in clinical practice and research after basic training.
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Amariei, Sonia, Gheorghe Gutt e Liliana Anchidin-Norocel. "Method and Sensory System for Determination of the Liquids Surface Tension". Engineering Proceedings 6, n. 1 (17 maggio 2021): 82. http://dx.doi.org/10.3390/i3s2021dresden-10101.
Testo completoAbstract (sommario):
A new method and related sensory system used to determine the surface tension (γ) of a liquid investigated based on the increase of the area (A) of a drop vibrated sinusoidally is presented. The materialization of the method consists in specific device placed on the table of a microscope or a stereomicroscope, both based on the principle of light reflection. A drop of the analyzed liquid deposited with a dispenser on a metal plate, vibrated electrodynamically under the action of a sinusoidal oscillation, of constant frequency and amplitude, increases its surface wetted on the metal plate with each applied sinusoidal oscillation. At each magnification of the droplet surface area, an image acquisition takes place through the optoelectronic system of the microscope or stereomicroscope, the frequency of the oscillations being strictly correlated with the acquisition frequency of the images. At a predetermined number of images/oscillations, using specific software, both the images of the droplets and the graph containing the number of pixels inside the outline of each image and the current number of vibration corresponding to that image are displayed. The surface tension is automatically expressed by the growth speed of the drops surface, speed given by the curve slope of the pixels number of the drops according to the current number of the oscillation. A collateral application is the possibility of using the sensory system and specialized software for rapid determination of solutions concentration, measuring the surface tension using the Szyszkowski relation.
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Arbuzov, Stanislav, Evgenij Gritskevich, Darja Michaylova e Anna Selezneva. "MEASUREMENT OF THE SPECTRAL REFLECTION COEFFICIENTS FOR SURFACES UNDER A MULTISPECTRAL AERIAL SURVEY BY DIGITAL CAMERA". Interexpo GEO-Siberia 8 (2019): 279–85. http://dx.doi.org/10.33764/2618-981x-2019-8-279-285.
Testo completoAbstract (sommario):
Monitoring of the environment with the help of unmanned aerial vehicles is currently one of the most developing branches of optoelectronic instrument-making. Digital cameras installed on these devices make it possible to survey the underlying surface in order to select the its features. The use of unmanned aerial vehicles for the control of agricultural lands is a very perspective case of such monitoring. The technique of measuring the spectral reflection coefficients of surfaces is developed for identification of the vegetation state observed in the field of view of multispectral digital camera. The method allows determining the spectral reflectance of the calibration surfaces using the reference ones and after that to find the parameters of working surfaces using the calibration ones. The obtained results are applied under the analysis and processing of images obtained in the course of the unmanned aviation system that monitors agricultural lands.
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Fei, Xia, Jun Yao, Wei Li, Wei Qiang Xue e Shao Hua Zhang. "Design of a High Resolution and Dual-Path Optical Water Turbidimeter". Applied Mechanics and Materials 577 (luglio 2014): 713–16. http://dx.doi.org/10.4028/www.scientific.net/amm.577.713.
Testo completoAbstract (sommario):
We have designed a high resolution and dule-path optical turbidimeter. The right angle scatted light turbidimeter is mainly for water in low turbidity levels, especially for drinking water. Mechanical design of the optoelectronic receiving room and the realizing circuit for modulation and demodulation are described in detail. To achieve good linearity in the measuring range from 0 to 5 NTU, pulse width modulation (PWM) and demodulation techniques are proposed, in this way, low temperature-drift and good anti-jamming ability can be obtained without the interference of background light. To improve the precision, the ratio algorithm which measures the ratio of the scattered light and reflected light is introduced in a dule-path optical system so that the interference of light emission can be eliminated effectively. Through the analysis and comparison of the experimental results, the linearity is improved by the ratio algorithm with a correlation coefficient for about 0.99932.
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Bocharnikov, A. I., V. P. Kovalenko, A. V. Kovalenko, V. V. Tikhonychev e A. V. Khudyakov. "Space Zonal Survey to Determine the Speed and Acceleration of Moving Objects". Rocket-space device engineering and information systems 8, n. 1 (2021): 48–58. http://dx.doi.org/10.30894/issn2409-0239.2021.8.1.48.58.
Testo completoAbstract (sommario):
The paper considers a method for determining the motion parameters of moving objects based on the results of space zonal survey. A system of equations is proposed for determining the motion parameters under various conditions of motion of a moving object (on a plane, in three-dimensional space, and with a single and multiple observation). The speeds and accelerations of moving objects (vehicles, etc.) are determined by measuring the relative position of zonal images on complex materials of panchromatic and multispectral survey (pansharpening) taking into account the location of optoelectronic converters of spectral channels relative to each other in the target survey equipment. A feature for determining the direction of movement of moving objects using the colors of zonal images is formed. Algorithms for calculating the speed and acceleration for the case of rectilinear motion of objects are developed. The results of processing real images are presented.
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Goto, Hiroshi. "XY Stage Capable of Positioning in Submicron Order". Journal of Robotics and Mechatronics 1, n. 4 (20 dicembre 1989): 333–37. http://dx.doi.org/10.20965/jrm.1989.p0333.
Testo completoAbstract (sommario):
With the progress in microelectronic and optoelectronic devices, precision positioning technology has become more and more important. Such technology is indispensable for the positioning operation between the mask and the wafer in super LSI production, precision processing of optical parts such as the non-spherical lens, and in precision measuring instruments such as the scanning tunneling microscope, etc. These devices require positioning accuracy in the order of submicrons (0 .1μm) or subsubmicrons (0.0lμm). To achieve such accuracy, various devices have been made for mechanism and control. The author and others have developed two kinds of positioning stage, an XY stage of a externally pressurized bearing guide system driven by a DC linear motor, and an XY stage of an elastic hinge spring guide system driven by a piezoelectric actuator and we have achieved positioning accuracy of 0.1 to 0.01µm. These two kinds of XY stages will be described below as examples with a description of the structural features and performance as well as the important points of their configuration.
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Muniz-Pardos, Borja, Gabriel Lozano-Berges, Jorge Marin-Puyalto, Alex Gonzalez-Agüero, German Vicente-Rodriguez, Jose A. Casajus e Nuria Garatachea. "Validity and reliability of an optoelectronic system to measure movement velocity during bench press and half squat in a Smith machine". Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 234, n. 1 (6 settembre 2019): 88–97. http://dx.doi.org/10.1177/1754337119872418.
Testo completoAbstract (sommario):
The purpose of this study was to determine the validity and reliability of a camera-based optoelectronic system to measure movement velocity during bench press and half squat at different load intensities. A total of 22 active males (age: 28.2 ± 3.9 years; one-repetition maximum bench press: 77.9 ± 19.0 kg; one-repetition maximum half squat: 116.6 ± 22.5 kg) participated in this study. After an initial one-repetition maximum testing session, participants performed five repetitions for each load (40%, 60% and 80% one-repetition maximum) and exercise (bench press and half squat) on a Smith machine in the second testing session. A third testing session was used for the test–retest reliability study. Time, displacement and mean propulsive velocity were simultaneously determined by the reference method (T-Force system) and the Velowin system. In bench press, ordinary least products regression analysis revealed low fixed biases for mean propulsive velocity at 40%, time at 60% and displacement at 80% one-repetition maximum (intercept = 0.065 m s−1, −28.02 ms and 0.87 cm, respectively). In half squat, low fixed biases were also detected for mean propulsive velocity at 40% and 80% one-repetition maximum (intercept = −0.040 and 0.023 m s−1, respectively), time at 40% and 60% one-repetition maximum (intercept = −53.05 and −101.85 ms, respectively) and displacement at 60% one-repetition maximum (intercept = −1.95 cm). Proportional bias was only observed for mean propulsive velocity at 80% bench press. In half squat, there was proportional bias for time and mean propulsive velocity at 40% one-repetition maximum, and also for time at 60% one-repetition maximum. The reliability test showed low and comparable fixed and proportional biases between systems across exercises and intensities. Velowin confirmed to be a valid and reliable system to measure movement velocity across a wide range of intensities (40%–80% one-repetition maximum) for two basic strength exercises through a robust statistical approach. Velowin would provide coaches and trainers with a suitable, affordable and easy-to-use equipment capable of measuring movement velocity in various exercises at different load intensities.