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Journal articles on the topic 'Optical distance measurement'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Siyal, Arihant. "Optical distance measurement systems." Acta Mechatronica 8, no. 4 (2023): 37–42. http://dx.doi.org/10.22306/am.v8i4.100.

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The article deals with optical systems suitable for distance measurement. Contactless distance measurement must be implemented, for example, when detecting the presence of persons and objects in the monitored area. In industry, there are increased demands on measurement uncertainty using these systems. In these cases, verification and calibration of these measurement systems are also necessary.

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Kukołowicz, Paweł, Dariusz Szalkowski, Beata Jackowska-Zduniak, and Mikołaj Tarchalski. "Optical system for precise isocenter measurement." Polish Journal of Medical Physics and Engineering 29, no. 4 (2023): 178–84. http://dx.doi.org/10.2478/pjmpe-2023-0019.

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Abstract Introduction: The geometrical precision of the machines is essential for effective and safe radiotherapy. Methods currently used for the measurement of the mechanical isocenter have many limitations. In this work, the optical system NaviRation for very precise measurement of mechanical accelerator isocenter is described. The results of the measurement of the isocenter for linear accelerator are also presented. Materials and methods: An optical system for measuring the accelerator isocenter was designed and built. The optical system consists of two cameras recording the target position

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Pillarz, Marc, Axel von Freyberg, Dirk Stöbener, and Andreas Fischer. "Gear Shape Measurement Potential of Laser Triangulation and Confocal-Chromatic Distance Sensors." Sensors 21, no. 3 (2021): 937. http://dx.doi.org/10.3390/s21030937.

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The demand for extensive gear shape measurements with single-digit µm uncertainty is growing. Tactile standard gear tests are precise but limited in speed. Recently, faster optical gear shape measurement systems have been examined. Optical gear shape measurements are challenging due to potential deviation sources such as the tilt angles between the surface normal and the sensor axis, the varying surface curvature, and the surface properties. Currently, the full potential of optical gear shape measurement systems is not known. Therefore, laser triangulation and confocal-chromatic gear shape mea

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Kienle, Patrick, Lorena Batarilo, Markus Akgül, et al. "Optical Setup for Error Compensation in a Laser Triangulation System." Sensors 20, no. 17 (2020): 4949. http://dx.doi.org/10.3390/s20174949.

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Absolute distance measurement is a field of research with a large variety of applications. Laser triangulation is a well-tested and developed technique using geometric relations to calculate the absolute distance to an object. The advantages of laser triangulation include its simple and cost-effective setup with yet a high achievable accuracy and resolution in short distances. A main problem of the technology is that even small changes of the optomechanical setup, e.g., due to thermal expansion, lead to significant measurement errors. Therefore, in this work, we introduce an optical setup cont

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XING, Shujian, Furong WANG, Yizhao WANG, and Mengfei CHANG. "Theoretical analysis of absolute distance measurement based on multi-pulse spectral interferometry by using optical frequency comb." Acta Physica Sinica 74, no. 7 (2025): 070601. https://doi.org/10.7498/aps.74.20250024.

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In industrial sites and outdoor long-distance measurements, the difficulty in accurately measuring and correcting the refractive index of air is a critical factor affecting precise distance measurement. In order to develop a simple, long-range, and high-precision absolute distance measurement technique, in this work an absolute distance measurement method is presented based on multi-pulse spectral interferometry by using an optical frequency comb. This method can dynamically correct the measurement errors introduced by group refractive index fluctuations. Firstly, a mathematical model for mult

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Neitsch, Marie, Iris-Susanne Horn, Mathias Hofer, Andreas Dietz, and Miloš Fischer. "Integrated Multipoint-Laser Endoscopic Airway Measurements by Transoral Approach." BioMed Research International 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/6838697.

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Objectives. Optical and technical characteristics usually do not allow objective endoscopic distance measurements. So far no standardized method for endoscopic distance measurement is available. The aim of this study was to evaluate the feasibility and accuracy of transoral airway measurements with a multipoint-laser endoscope.Methods.The semirigid endoscope includes a multipoint laser measurement system that projects 49 laser points (wavelength 639 nm, power < 5 mW) into the optical axis of the endoscopic view. Distances, areas, and depths can be measured in real-time. Transoral endoscopic

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Wang, Wei Chen, Ding Chen, Hong Tang Gao, and Zi Ben Yang. "Study on Dynamic Measurement of Plane Distance." Key Engineering Materials 625 (August 2014): 91–97. http://dx.doi.org/10.4028/www.scientific.net/kem.625.91.

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Step gauge is the most typical multiple target standard of plane distance with a wide range of applications. The calibration of step gauge is, however, difficult because of its unique structure. In this paper, a new method for measuring plane distance is presented. The principle of light-section microscope is used in accurate positioning of the planes being measured. Then the optical interferometry techniques are used to realize continuous dynamic measurement of the plane distance. Based on this method, a novel optical probe is built and installed on a laser interferometer for length measureme

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Elri, Ziya, and Atilla Ergüzen. "Advancing defense capabilities through integration of electro-optical systems and computer vision technologies." Journal of Computer & Electrical and Electronics Engineering Sciences 2, no. 1 (2024): 17–24. http://dx.doi.org/10.51271/jceees-0013.

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This paper presents a comprehensive study on the integration of cutting-edge technologies to enhance defense capabilities, focusing on object detection, tracking, and distance measurement tasks. Also, the integration of IMX219-77 cameras and Nvidia Jetson Nano for object detection, tracking, and distance measurement in electro-optical systems is proposed. The decision to combine these components was based on their individual strengths: the high resolution and wide field of view of the IMX219-77 cameras, and the low-power, high-performance capabilities of the Jetson Nano. Software-wise, OpenCV

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Junttila, Petri, Kalervo Nevala, and Petter Kroneld. "Enhancing the Accuracy of MRI-Compatible Robots with an Optical Tracking System." Solid State Phenomena 144 (September 2008): 191–95. http://dx.doi.org/10.4028/www.scientific.net/ssp.144.191.

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Magnetic resonance imaging (MRI) is currently a widely used technology for obtaining a three-dimensional image of a patient’s internal structures. This study examines the measurement properties of an optical tracking system utilised in the MRI room. The results were used to assess the suitability of the device to be used as a part of the control system of a surgical robot. The position and orientation of the instrument, MRI scanner and the patient are measured using an optical tracking system in the MRI room. The measurement data can be used to display the instrument used as a part of the imag

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Daliga, Karol, and Zygmunt Kurałowicz. "EXAMINATION METHOD OF THE EFFECT OF THE INCIDENCE ANGLE OF LASER BEAM ON DISTANCE MEASUREMENT ACCURACY TO SURFACES WITH DIFFERENT COLOUR AND ROUGHNESS." Boletim de Ciências Geodésicas 22, no. 3 (2016): 420–36. http://dx.doi.org/10.1590/s1982-21702016000300024.

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Interest in the influence of the incidence angle of a laser beam to distance measurements can be seen in many areas of science and technology: geodesy, glaciology, archaeology, machine automation, and others. This paper presents results of measurements of the effect of the incidence angle of a laser beam to distance measurements to the surfaces of different colour and roughness by Topcon's electro-optical total station with an accuracy of 3 mm. Measurement method and the method of elimination of test stand errors are presented. The results of measurements have been analysed and the influence o

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Shimizu, Yuki, Hiraku Matsukuma, and Wei Gao. "Optical Angle Sensor Technology Based on the Optical Frequency Comb Laser." Applied Sciences 10, no. 11 (2020): 4047. http://dx.doi.org/10.3390/app10114047.

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A mode-locked femtosecond laser, which is often referred to as the optical frequency comb, has increasing applications in various industrial fields, including production engineering, in the last two decades. Many efforts have been made so far to apply the mode-locked femtosecond laser to the absolute distance measurement. In recent years, a mode-locked femtosecond laser has increasing application in angle measurement, where the unique characteristics of the mode-locked femtosecond laser such as the stable optical frequencies, equally-spaced modes in frequency domain, and the ultra-short pulse

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Xu, Xinyang, Ziqiang Zhang, Haoyun Zhang, et al. "Long distance measurement by dynamic optical frequency comb." Optics Express 28, no. 4 (2020): 4398. http://dx.doi.org/10.1364/oe.381504.

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13

Gouaux, Flore, Noël Servagent, and Thierry Bosch. "Absolute distance measurement with an optical feedback interferometer." Applied Optics 37, no. 28 (1998): 6684. http://dx.doi.org/10.1364/ao.37.006684.

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14

Pillarz, Marc, Axel von Freyberg, and Andreas Fischer. "Determination of the mean base circle radius of gears by optical multi-distance measurements." Journal of Sensors and Sensor Systems 9, no. 2 (2020): 273–82. http://dx.doi.org/10.5194/jsss-9-273-2020.

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Abstract. The required reliability of wind turbine gearboxes increases the requirements for large gear measurements. Extensive measurements to reliably assess the geometry of large gears in the single micrometer range are necessary. Due to an individually fixed measuring volume, standard methods like coordinate and gear measuring instruments reach their limits for large gears with diameters > 1 m. Therefore, a scalable optical measurement approach consisting of a single sensor in combination with a rotary table for multi-distance measurements with subsequent model-based evaluation of shape

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WANG Zhi-bin, 王志斌, 史国华 SHI Guo-hua, 何益 HE Yi, 丁志华 DING Zhi-hua, and 张雨东 ZHANG Yu-dong. "Application of optical coherence tomography to distance measurement of optical surface." Optics and Precision Engineering 20, no. 7 (2012): 1469–74. http://dx.doi.org/10.3788/ope.20122007.1469.

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Majumdar, Ayan, and Haiying Huang. "Compact optical fiber whitelight interferometric distance sensor for arbitrary small distance measurement." Applied Optics 48, no. 19 (2009): 3702. http://dx.doi.org/10.1364/ao.48.003702.

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17

Huang, Ying-Ke, Yue-Dong Fang, Kai-Xing Lu, et al. "Application of a Space-based Optical Interferometer Toward Measuring Cosmological Distances of Quasars." Research in Astronomy and Astrophysics 22, no. 3 (2022): 035011. http://dx.doi.org/10.1088/1674-4527/ac4703.

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Abstract Measuring quasar distance through joint analysis of spectroastrometry and reverberation mapping observations is a new method for driving the development of cosmology. In this paper, we carry out detailed simulation and analysis to study the effect of four basic observational parameters (baseline length, exposure time, equivalent diameter and spectral resolution) on the data quality of differential phase curves (DPCs), and furthermore on the accuracy of distance measurement. In our simulation, we adopt an axisymmetrical disk model of a broad line region (BLR) to generate differential p

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Zhou, Yingjian, Yanhong Yuan, and Meixue Su. "Research on Fiber-Optic Optical Coherence Ranging System Based on Laser Frequency Scanning Interferometry." Sensors 24, no. 6 (2024): 1838. http://dx.doi.org/10.3390/s24061838.

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In this paper, a system for absolute distance measurement is proposed based on laser frequency scanning interferometry (FSI). The system utilizes a digitally tunable laser as the light source and employs synchronized pulses to drive an analog-to-digital converter (ADC) for interference signal acquisition. The frequency domain demodulation for absolute distance measurement is achieved through a three-spectrum line interpolation method based on the Hanning window. The system takes advantage of the spatial filtering characteristics of a single-mode optical fiber and the diffuse reflection propert

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Brahynets, I. O., and Yu O. Masjurenko. "EFFICIENCY OF OPTICAL CALIBRATION IN HIGH PRECISION LASER RANGEFINDERS." Tekhnichna Elektrodynamika 2023, no. 5 (2023): 74–81. http://dx.doi.org/10.15407/techned2023.05.074.

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The effectiveness of the use of optical calibration in high-precision phase laser rangefinders has been evaluated. In order to ensure the specified accuracy of distance determination in order to establish the optimal frequency of distance measurement modes and optical calibration, an appropriate formula is recommended for estimating the switching frequency of signals at the input of the range finder measuring channel. It has been established that even when using optical calibration, the accuracy of distance measurement is affected by the error of the phase detector, which is part of the rangef

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20

Li, Runmin, Haochen Tian, Junkai Shi, Rongyi Ji, Dengfeng Dong, and Weihu Zhou. "Impact of Cyclic Error on Absolute Distance Measurement Based on Optical Frequency Combs." Sensors 24, no. 11 (2024): 3497. http://dx.doi.org/10.3390/s24113497.

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Absolute distance measurements based on optical frequency combs (OFCs) have greatly promoted advances in both science and technology, owing to the high precision, large non-ambiguity range (NAR), and a high update rate. However, cyclic error, which is extremely difficult to eliminate, reduces the linearity of measurement results. In this study, we quantitatively investigated the impact of cyclic error on absolute distance measurement using OFCs based on two types of interferometry: synthetic wavelength interferometry and single-wavelength interferometry. The numerical calculations indicate tha

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21

Babković, Kalman, László F. Nagy, and Damir Krklješ. "Self-Calibrating Optical Displacement Sensor." Key Engineering Materials 543 (March 2013): 59–62. http://dx.doi.org/10.4028/www.scientific.net/kem.543.59.

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Commercially available reflective optical sensors can be used as displacement sensors which in turn can be used in vibration monitoring, positioning, force-measurement and other applications. The sensor output depends in all cases on the distance between the component and a suitable reflective surface. In this paper a sensor system applicable to vibration measurement (e.g. monitoring a vibration-generating machine mounted on elastic isolation mountings) is presented where a special mechanism enables the controlled adjustment of the reflective surfaces position. This feature allows continuous o

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22

Li Zhidong, 李志栋, 江月松 Jiang Yuesong, 桑峰 Sang Feng, et al. "Interferometry for Absolute Distance Measurement." Acta Optica Sinica 31, no. 3 (2011): 0314001. http://dx.doi.org/10.3788/aos201131.0314001.

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23

Niewiem, Witold, Sebastian Figura, Martin Dusek, Dirk Mergelkuhl, Jean-Christophe Gayde, and Andreas Wieser. "Shutter-type multi-point optical alignment using a Structured Laser Beam in vacuum." Journal of Instrumentation 20, no. 07 (2025): P07001. https://doi.org/10.1088/1748-0221/20/07/p07001.

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Abstract This paper presents an alignment concept employing a Structured Laser Beam (SLB) for offset measurements over a 140 m distance. The prototype consists of an SLB generator and three measurement stations within a vacuum system. The Inner Core (IC) of the SLB establishes an optical axis that serves as a reference line. A comparative assessment is performed against a Wire Positioning System (WPS) and Hydrostatic Levelling System (HLS). Two independent measurements of the prototype show that it exhibits high relative precision, with a standard deviation of offset measurements below 20 μm.

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24

Hariyama, Tatsuo, Hiroaki Kasai, and Masahiro Watanabe. "Development of Distance Measurement Technique Using Optical Comb Laser." Journal of the Japan Society for Precision Engineering 86, no. 5 (2020): 347–52. http://dx.doi.org/10.2493/jjspe.86.347.

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Zhao Lijie, 赵力杰, 周艳宗 Zhou Yanzong, 夏海云 Xia Haiyun, 武腾飞 Wu Tengfei, and 韩继博 Han Jibo. "Overview of distance measurement with femtosecond optical frequency comb." Infrared and Laser Engineering 47, no. 10 (2018): 1006008. http://dx.doi.org/10.3788/irla201847.1006008.

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26

Wu, Hanzhong, Fumin Zhang, Tingyang Liu, Petr Balling, Jianshuang Li, and Xinghua Qu. "Long distance measurement using optical sampling by cavity tuning." Optics Letters 41, no. 10 (2016): 2366. http://dx.doi.org/10.1364/ol.41.002366.

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27

Seta, Katuo, Tadanao Ohishi, and Shoichi Seino. "Optical Distance Measurement Using Inter-Mode Beat of Laser." Japanese Journal of Applied Physics 24, Part 1, No. 10 (1985): 1374–75. http://dx.doi.org/10.1143/jjap.24.1374.

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28

Wu, Hanzhong, Fumin Zhang, Tingyang Liu, Fei Meng, Jianshuang Li, and Xinghua Qu. "Absolute Distance Measurement Using Optical Sampling by Cavity Tuning." IEEE Photonics Technology Letters 28, no. 12 (2016): 1275–78. http://dx.doi.org/10.1109/lpt.2016.2538266.

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Bui, Ngoc-Thang, Thi My Tien Nguyen, Bang Le-Huy Nguyen, et al. "Improved accuracy of optical distance sensor based on artificial neural network applied to real-time systems." Measurement Science and Technology 33, no. 7 (2022): 075001. http://dx.doi.org/10.1088/1361-6501/ac527e.

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Abstract Optical time-of-flight sensors have potential in the revolution of distance measurement. These sensors can continuously monitor the distance and track the movement of objects. However, the existing sensing methods for such distance optical sensors mainly calculate the flight time, e.g. pulse transmission and receiving time, without considering the environmental effects. Therefore, the measurement accuracy is severely reduced. There are other technologies with higher accuracy in distance measurement. Nonetheless, they are too expensive due to the high accurate power supply. In this pap

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Duong, Chen, and Chen. "Absolute Depth Measurement Using Multiphase Normalized Cross-Correlation for Precise Optical Profilometry." Sensors 19, no. 21 (2019): 4683. http://dx.doi.org/10.3390/s19214683.

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In a multifrequency phase-shifting (MFPS) algorithm, the temporal phase unwrapping algorithm can extend the unambiguous phase range by transforming the measurement range from a short fringe pitch into an extended synthetic pitch of two different frequencies. However, this undesirably amplifies the uncertainty of measurement, with each single-frequency phase map retaining its measurement uncertainty, which is carried over to the final unwrapped phase maps in fringe-order calculations. This article analyzes possible causes and proposes a new absolute depth measurement algorithm to minimize the p

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Bartel, Norbert. "Determinations of Distances to Radio Sources with VLBI." Symposium - International Astronomical Union 129 (1988): 175–84. http://dx.doi.org/10.1017/s0074180900134424.

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The most direct method of determining distances to galactic sources outside the Solar System is the measurement of annual parallaxes. Using as an example astrometric observations of the quasars 3C345 and NRAO512 which are separated by ∼ 0°.5 at the sky, we show that under certain conditions, annual parallaxes of galactic radio sources can be determined with VLBI with an accuracy of 50 μas (standard error). This accuracy is about tenfold higher than any annual parallax accuracy ever obtained with optical astrometry.The, so far, most direct method of determining distances to extragalactic source

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Karam, Frederick Khalil, Karla Zancope, Thiago de Almeida Prado Naves Carneiro, Murilo Navarro de Oliviera, Caio César Dias Resende, and Flávio Domingues das Neves. "Comparative analysis of Optical Microscopy, Scanning Electron Microscopy, and Micro-Computed Tomography on measurements." Brazilian Journal of Oral Sciences 16 (December 15, 2017): 1–9. http://dx.doi.org/10.20396/bjos.v16i0.8651056.

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Microscopic measurements are widely used in scientific research and the correct equipment to realize these evaluations could be critical to determine study results. Regarding microscopic measurements, three of the most used methods are: Optical Microscopy (OM), Scanning Electron Microscopy (SEM), and Micro-computed Tomography (MCT). It is important to select the best method for assessing diverse parameters, considering operational characteristics of the method, the equipment efficiency, and the machinery cost. Therefore, the main objective of this study was to define which is the most useful m

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Dix, Stefan, Jonas Gutsche, Erik Waller, Georg von Freymann, and Artur Widera. "Fiber-tip endoscope for optical and microwave control." Review of Scientific Instruments 93, no. 9 (2022): 095104. http://dx.doi.org/10.1063/5.0100330.

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We present a robust, fiber-based endoscope with a silver direct-laser-written structure for radio frequency (RF) emission next to the optical fiber facet. Thereby, we are able to excite and probe a sample, such as nitrogen-vacancy (NV) centers in diamond, with RF and optical signals simultaneously and specifically measure the fluorescence of the sample fully through the fiber. At our targeted frequency range of around 2.9 GHz, the facet of the fiber core is in the near-field of the RF-guiding silver structure, which comes with the advantage of an optimal RF intensity decreasing rapidly with th

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Zhang, Chengyang, Xishuang Jing, Siyu Chen, Xuanzhe Ling, Jiarong Zou, and Gang Zhao. "Method of improving large-scale measurement accuracy of laser tracker based on photogrammetry." Measurement and Control 52, no. 9-10 (2019): 1220–27. http://dx.doi.org/10.1177/0020294018813644.

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Background: When performing the spatial large-scale measurements, the measurement accuracy of laser tracker would decreased with the increase of the measurement distances due to the refraction difference of most optical digital measurement devices. Therefore, this paper proposed a method based on photogrammetry system to improve the large-scale measurement accuracy of the laser tracker. Purpose: The purpose of this method is to improve the large-scale measurement accuracy of the laser tracker by considering the advantages of photogrammetry system such as high measurement accuracy and good port

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Niu, Qiong, Mingyu Song, Jihui Zheng, et al. "Improvement of Distance Measurement Based on Dispersive Interferometry Using Femtosecond Optical Frequency Comb." Sensors 22, no. 14 (2022): 5403. http://dx.doi.org/10.3390/s22145403.

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Since the dispersive interferometry (DPI) based on optical frequency combs (OFCs) was proposed, it has been widely used in absolute distance measurements with long-distance and high precision. However, it has a serious problem for the traditional DPI based on the mode-locked OFC. The error of measurements caused by using the fast Fourier transform (FFT) algorithm to process signals cannot be overcome, which is due to the non-uniform sampling intervals in the frequency domain of spectrometers. Therefore, in this paper, we propose a new mathematical model with a simple form of OFC to simulate an

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Takiyama, Kazuaki, Masaki Yasugi, Shiro Suyama, Kenichiro Masaoka, and Hirotsugu Yamamoto. "10‐2: Line‐Based Modulation Transfer Function Measurement of Aerial Display by Use of Arrayed Optical Elements." SID Symposium Digest of Technical Papers 54, no. 1 (2023): 109–12. http://dx.doi.org/10.1002/sdtp.16500.

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We measured the spatial resolution characteristics of aerial displays using a corner‐cube reflector array and a dihedral corner reflector array, both of which are major arrayed optical elements. In this study, we applied the line‐based MTF measurement method to aerial displays. according to floating distances for prospective applications. The MTF measurement results suggest that the arrayed optical element for the aerial display should be selected based on the desired floating distance.

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Onoe, Taro, Satoru Takahashi, Kiyoshi Takamasu, and Hirokazu Matsumoto. "Development of a Non-Contact Precision Measurement Technique Using Optical Frequency Combs." Key Engineering Materials 523-524 (November 2012): 877–82. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.877.

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We develop a new method for high-resolution and contactless distance measurement based on self frequency beats of optical frequency combs. We use two optical frequency comb lasers with Rb-stabilized repetition frequencies for doing accurate distance measurement. The repetition frequencies of the optical frequency combs are different, thus parts of the high frequencies such as several gigahertz of self beats are beat-downed to several megahertz without an RF frequency oscillator. The phases of the beat signals of several megahertz frequencies are measured by a lock-in amplifier with a high reso

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Jeong, Hoseong, Baekeun Jeong, Myounghee Han, and Dooyong Cho. "Analysis of Fine Crack Images Using Image Processing Technique and High-Resolution Camera." Applied Sciences 11, no. 20 (2021): 9714. http://dx.doi.org/10.3390/app11209714.

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Visual inspections are performed to investigate cracks in concrete infrastructure. These activities require manpower or equipment such as articulated ladders. Additionally, there are health and safety issues because some structures have low accessibility. To deal with these problems, crack measurement with digital images and digital image processing (DIP) techniques have been adopted in various studies. The objective of this experimental study is to evaluate the optical limit of digital camera lenses as working distance increases. Three different lenses and two digital cameras were used to cap

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Idesawa, Masanori. "Acquisition of 3-D Optical Information." Journal of Robotics and Mechatronics 1, no. 4 (1989): 255. http://dx.doi.org/10.20965/jrm.1989.p0255.

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In order for a machine to have the capacity to operate flexibly in a 3-D environment, it is indispensable for it to be equipped with space information acquisition capability, and tools for distance measurement are in turn indispensable for obtaining space information. Indeed distance measurement is basic and important not only for a robot, but also for science and technology in general. Many methods have been proposed for obtaining distance information, ranging from the mechanical contact type through optical and acoustic to electric and magnetic methods, and many are in practical use. Among t

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Zhang, Haoyun, Xinyang Xu, Haihan Zhao, Fanpeng Dong, Zhiwen Qian, and Bin Xue. "Water Temperature and Salinity Measurement Using Frequency Comb." Applied Sciences 9, no. 23 (2019): 5043. http://dx.doi.org/10.3390/app9235043.

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Water temperature and salinity are key parameters in many fields such as industry, forestry and agriculture. In this paper, we, theoretically and experimentally, demonstrate a method which is capable of water temperature and salinity measurement based on a laser frequency comb at 518 nm. We have developed a simple Michelson interferometer system. By scanning a mirror on a precision displacement platform, a pair of cross-correlation patterns can be obtained. The real-time optical distance information from these cross-correlation patterns can be used to calculate the optical distance difference

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Bräuer-Burchardt, Christian, Christoph Munkelt, Ingo Gebhart, et al. "A-Priori Calibration of a Structured Light Underwater 3D Sensor." Journal of Marine Science and Engineering 8, no. 9 (2020): 635. http://dx.doi.org/10.3390/jmse8090635.

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In this study, we introduce a new calibration method for underwater optical stereo scanners. It uses air calibration, additional underwater parameters, and extended camera modeling. The new methodology can be applied to both passive photogrammetric and structured light three-dimensional (3D) scanning systems. The novel camera model uses a variable principal distance depending on the radial distance to the principal point instead of two-dimensional distortion functions. This allows for an initial improvement of 3D reconstruction quality. In a second step, certain underwater-specific parameters—

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Kovalev, S. V., and D. A. Shapovalov. "Kovalev passive rangefinder." Geodesy and Cartography 969, no. 3 (2021): 12–18. http://dx.doi.org/10.22389/0016-7126-2021-969-3-12-18.

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The authors present the results of longtime research on the development and improvement of a passive geodetic rangefinder based on the inbasis method of distance measurement. Actually, active laser range finders are not always effective at field works. An original compact optical scheme of a passive rangefinder based on a theodolite telescope and a mould photo receiver with application of digital methods for coordinate calculation is proposed. The distance and dimensions of the object are defined. The former is identified by the shift between the images on the horizontal axis. The merit of suc

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Šidlof, Petr, Pavel Šidlof, Martin Štěpán, David Šimurda, and Jan Lepicovsky. "Laser triangulation measurement of blade oscillation in a transonic compressor cascade." Journal of Physics: Conference Series 2511, no. 1 (2023): 012010. http://dx.doi.org/10.1088/1742-6596/2511/1/012010.

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Abstract The paper describes a method for optical measurement of oscillation of blades in a linear cascade designed for flutter research. The method uses laser triangulation, which measures the distance between the sensor and the oscillation object. The distance can be recalculated to angular displacement of the blade. However, the relation is nonlinear due to the curvature of the blade. The nonlinear dependence between the distance and angular displacement is derived and quantified analytically. The paper further analyzes the influence of light refraction in the optical window, surface qualit

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Fonseca, Joao Antonio Santos Dias, Antonio Baptista, Ma Joao Martins, and Joao Paulo N. Torres. "Distance Measurement Systems Using Lasers and Their Applications." Applied Physics Research 9, no. 4 (2017): 33. http://dx.doi.org/10.5539/apr.v9n4p33.

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Optical measuring systems came to offer new ways to determine distances, deformations or vibrations through more accurate and greater range methods. Technological progress has allowed a significant improvement of several components, including the optical ones. Thus, the development of essential measurement methods is crucial to keep up with technological advances.In this paper, the three basic methods of measurement are studied – triangulation, telemetry and interferometry, covering their main applications, advantages and disadvantages, and theoretically substantiating each of the methods. The

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Duan, Shipeng, Jiadong Liang, Zeyu Cai, et al. "Research on the Fiducial Fibre Coding and Identification Algorithm of the LAMOST Fibre Positioning System." Publications of the Astronomical Society of the Pacific 134, no. 1041 (2022): 115003. http://dx.doi.org/10.1088/1538-3873/ac9b93.

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Abstract To obtain the world coordinates of a measured object in camera measurement, a certain number of image control points should be established around the detected object as fiducial points for data processing. The precision of a fiducial point directly determines the measurement accuracy of the measured object in the camera measurement. Fiducial points in camera measurement are widely used in various fields of measurement, such as aerial surveys, close-range surveys, and 3D reconstruction. In addition, a fiducial point generally adopts an encoding structure to reduce the search cost in th

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Sy, Luke Wicent F., Nigel H. Lovell, and Stephen J. Redmond. "Estimating Lower Limb Kinematics Using a Lie Group Constrained Extended Kalman Filter with a Reduced Wearable IMU Count and Distance Measurements." Sensors 20, no. 23 (2020): 6829. http://dx.doi.org/10.3390/s20236829.

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Tracking the kinematics of human movement usually requires the use of equipment that constrains the user within a room (e.g., optical motion capture systems), or requires the use of a conspicuous body-worn measurement system (e.g., inertial measurement units (IMUs) attached to each body segment). This paper presents a novel Lie group constrained extended Kalman filter to estimate lower limb kinematics using IMU and inter-IMU distance measurements in a reduced sensor count configuration. The algorithm iterates through the prediction (kinematic equations), measurement (pelvis height assumption/i

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Wang, Ruiping, Xiaomei He, Jiajia Dong, Xiangyu Cai, and Xueyi Zhang. "A Study on Distance Measurement System Based on Low -Coherence Interferometry." Journal of Engineering System 2, no. 4 (2024): 46–51. https://doi.org/10.62517/jes.202402408.

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A fiber-optic low-coherence interferometry system capable of absolute distance measurement is proposed. Light emitted from a broadband light source is split by a fiber-optic Michelson interferometer. When the optical path difference between the measurement arm and the reference arm falls within the coherence length of the light source, interference occurs. By demodulating the interference signal, the zero optical path difference (ZOPD) position can be obtained. The reference mirror is mounted on a reference arm translation stage to scan and locate the ZOPD positions of different measurement su

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Cavedo, Federico, Parisa Esmaili, and Michele Norgia. "Study of the Errors in Interpolated Fast Fourier Transform for Interferometric Applications." Metrology 4, no. 1 (2024): 117–30. http://dx.doi.org/10.3390/metrology4010008.

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Frequency estimation is often the basis of various measurement techniques, among which optical distance measurement stands out. One of the most used techniques is interpolated fast Fourier transform due to its simplicity, combined with good performance. In this work, we study the limits of this technique in the case of real signals, with reference to a particular interferometric technique known as self-mixing interferometry. The aim of this research is the better understanding of frequency estimation performances in real applications, together with guidance on how to improve them in specific o

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Zhang, Hongyuan, Haoyun Wei, Xuejian Wu, Honglei Yang, and Yan Li. "Absolute distance measurement by dual-comb nonlinear asynchronous optical sampling." Optics Express 22, no. 6 (2014): 6597. http://dx.doi.org/10.1364/oe.22.006597.

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Li, Wenliang, Xinghua Qu, Xianyu Zhao, and Fumin Zhang. "Absolute distance measurement of rough surfaces using asynchronous optical sampling." Optical Engineering 58, no. 09 (2019): 1. http://dx.doi.org/10.1117/1.oe.58.9.094101.

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