Log in

Relevant bibliographies by topics / Telecentrický optický systém / Journal articles

To see the other types of publications on this topic, follow the link: Telecentrický optický systém.

Journal articles on the topic 'Telecentrický optický systém'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 48 journal articles for your research on the topic 'Telecentrický optický systém.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Kulchitskiy, Aleksandr. "Optical Inspection Systems for Axisymmetric Parts with Spatial 2D Resolution." Symmetry 13, no. 7 (July 7, 2021): 1218. http://dx.doi.org/10.3390/sym13071218.

Full text

Abstract:

The article proposes a solution to the problem of increasing the accuracy of determining the main shaping dimensions of axisymmetric parts through a control system that implements the optical method of spatial resolution. The influence of the projection error of a passive optical system for controlling the geometric parameters of bodies of revolution from the image of its sections, obtained by a digital camera with non-telecentric optics, on the measurement accuracy is shown. Analytical dependencies are derived that describe the features of the transmission of measuring information of a system with non-telecentric optics in order to estimate the projection error. On the basis of the obtained dependences, a method for compensating the projection error of the systems for controlling the geometry of the main shaping surfaces of bodies of revolution has been developed, which makes it possible to increase the accuracy of determining dimensions when using digital cameras with a resolution of 5 megapixels or more, equipped with short-focus lenses. The possibility of implementing the proposed technique is confirmed by the results of experimental studies.

APA, Harvard, Vancouver, ISO, and other styles

2

Wu, Qiong, Yang Xiang, Bin Yang, Qian Song, Li Jie Hou, and Qian Qian Wu. "Optical Design of Endoscopic Telecentric Measuring Apparatus." Key Engineering Materials 552 (May 2013): 325–28. http://dx.doi.org/10.4028/www.scientific.net/kem.552.325.

Full text

Abstract:

Endoscopic telecentric apparatus is a precision measuring instrument which consists of optical, mechanical and electrical technologies. It can be applied in real-time accurate test to detect the position, shape and wall surface defects of brake master cylinder. This paper designed an optical system with Zemax, it can be used in endoscopic telecentric apparatus. The system has 4mm linear field of view, the line of vision is 90°,the magnification is 0.75×,the depth of field is 6mm.The value of modulation transfer function (MTF) is close to the diffraction limit, the resolution of the system is up to 3 and the spot diagrams of all configurations are smaller than Airy disk, the total track is less than 300mm. It adopts 1/6CCD to receive image, the measurement accuracy reaches to 0.03mm.The system uses pentagonal prism to realize 90°line of vision, it is convenient to assemble and avoids the mirror image. The image quality is good and the design meets the requirement.

APA, Harvard, Vancouver, ISO, and other styles

3

Wu, Zhe Ming, Xiao Pin Yang, Hong Bo Xie, Zhi Hong Chen, Fei Li, Bo Li, and Li Li Cao. "A Low-Distortion Single Fingerprint Acquisition Optical System." Advanced Materials Research 605-607 (December 2012): 2023–26. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.2023.

Full text

Abstract:

In this paper, a method of correction for the trapezoid distortion of the single fingerprint acquisition system is proposed, which combines nearly telecentric optical path and the inclined plane compensation. According to the method presented, an actual fingerprint acquisition system is designed. There is a prism and two lenses in the system. The resolution of fingerprint acquisition can reach 500dpi. Its optical length is in 45mm, the maximum grid distortion is 0.43%. These meet the standard of the FBI fingerprint scanning system.

APA, Harvard, Vancouver, ISO, and other styles

4

Wang, Ya Wei, Shou Wang Jiang, Xian Kai Wang, Xiang Long Tian, Qu Wei Yue, Yuan Yuan Xu, and Xue Fu Shang. "Design of Backward-Detection Optical System in Biological Cell Subclass Identification." Solid State Phenomena 181-182 (November 2011): 220–24. http://dx.doi.org/10.4028/www.scientific.net/ssp.181-182.220.

Full text

Abstract:

In order to improve the classification accuracy of cell subsets, a telecentric system which is based on the characteristics of cell’s scattering is designed. The irradiating and receiving light work collinearly in this system, and the optical receiving efficiency of back scatter light increases to twice the origin by using a special mirror. The optical design parameters and structures are given by using aberration theories and optical design software. The performance and signal collection of the optical system are analysised. When the resolution is 100lp/mm, the MTF is more than 0.17. The stray light is effectively filtered out and the accuracy of scattering signal is improved. The optical system can be used to identify eukocyte.

APA, Harvard, Vancouver, ISO, and other styles

5

Chang, Chun Li, Chun Jen Chen, and Wen Hong Wu. "Automatic Optical Measurement of High Density Fiber Connector." Key Engineering Materials 625 (August 2014): 305–9. http://dx.doi.org/10.4028/www.scientific.net/kem.625.305.

Full text

Abstract:

This paper will develop an automatic and fast optical measurement system for high density optical fiber connector measurement, which base on the optical project method. It will meet the lot of optical fiber connector measurement need. This system includes a high intensity and high collimated LED source, a high accuracy and high stiffness linear stage, 2 multi-degree-of-freedom adjustment mechanisms and a high resolution coaxial telecentric imaging system and image processing software. The system of measurement results and commercial measuring instruments comparing the results of its error is less than 0.6μm. To measure a V groove needs 750ms, this result may satisfy the requirements of automatic inspection.

APA, Harvard, Vancouver, ISO, and other styles

6

Ohno, Hiroshi, and Hiroya Kano. "Depth reconstruction with coaxial multi-wavelength aperture telecentric optical system." Optics Express 26, no. 20 (September 19, 2018): 25880. http://dx.doi.org/10.1364/oe.26.025880.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Zhou Lu, 周路, 迟耀丹 Chi Yaodan, and 郭亮 Guo Liang. "Optical System Design of Object-Telecentric Dual Finger Fingerprint Scanner." Laser & Optoelectronics Progress 53, no. 10 (2016): 102201. http://dx.doi.org/10.3788/lop53.102201.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Chen, Zhong, Huiyang Liao, and Xianmin Zhang. "Telecentric stereo micro-vision system: Calibration method and experiments." Optics and Lasers in Engineering 57 (June 2014): 82–92. http://dx.doi.org/10.1016/j.optlaseng.2014.01.021.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Jinhui, Li, Yu Yalin, and Tian Junwei. "Highprecision external screw measuring method based on doubletelecentric optical system." Journal of Applied Optics 37, no. 2 (2016): 244–49. http://dx.doi.org/10.5768/jao201637.0203004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Ye Wenwei, 叶文炜, 周天福 Zhou Tianfu, 黄锦煖 Huang Jinxuan, and 林峰 Lin Feng. "Design of Dual-Vision Double Telecentric Optical System Based on Machine Vision." Laser & Optoelectronics Progress 57, no. 1 (2020): 012202. http://dx.doi.org/10.3788/lop57.012202.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Pacheco, Shaun, and Rongguang Liang. "Snapshot, reconfigurable multispectral and multi-polarization telecentric imaging system." Optics Express 22, no. 13 (June 25, 2014): 16377. http://dx.doi.org/10.1364/oe.22.016377.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Lee, Hyunki, and Min Young Kim. "Automatic Optical Inspection System with Telecentric Optics and Phase-measuring Profilometry for Highly Accurate Localization of Electronic Packages." International Journal of Control, Automation and Systems 18, no. 8 (May 18, 2020): 2120–30. http://dx.doi.org/10.1007/s12555-019-0887-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Schmitt, Robert, Tilo Pfeifer, and Guilherme Mallmann. "Machine integrated telecentric surface metrology in laser structuring systems." ACTA IMEKO 2, no. 2 (January 15, 2014): 73. http://dx.doi.org/10.21014/acta_imeko.v2i2.106.

Full text

Abstract:

The laser structuring is an innovative technology used in a broad spectrum of industrial branches. There is, however, a market trend to smaller and more accurate micro structures, which demands a higher level of precision and efficiency in this process. In this terms, an inline inspection is necessary, in order to improve the process through a closed-loop control and early defect detection. Within this paper an optical measurement system for inline inspection of micro and macro surface structures is described. Measurements on standards and laser structured surfaces are presented, which underline the potential of this technique for inline surface inspection of laser structured surfaces.

APA, Harvard, Vancouver, ISO, and other styles

14

Zhiying, Liu, Gao Zhishan, Fu Weiwei, and Yuan Qun. "Optical system design of binocular pupil detector based on near infrared telecentric lens." Journal of Applied Optics 38, no. 3 (2017): 628–32. http://dx.doi.org/10.5768/jao201738.0306003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Garshin, A. S., A. V. Shukalov, and A. A. Moskalenko. "Optical projection system with a telecentric ray path for on-board aviation displays." Journal of Optical Technology 87, no. 8 (August 1, 2020): 479. http://dx.doi.org/10.1364/jot.87.000479.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Chen, Zhong, Dewen Zhou, Huiyang Liao, and Xianmin Zhang. "Precision Alignment of Optical Fibers Based on Telecentric Stereo Microvision." IEEE/ASME Transactions on Mechatronics 21, no. 4 (August 2016): 1924–34. http://dx.doi.org/10.1109/tmech.2016.2536784.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Zhang, Kun, Xing Zhong, Guo Zhang, Deren Li, Zhiqiang Su, Yao Meng, and Yonghua Jiang. "Thermal Stability Optimization of the Luojia 1-01 Nighttime Light Remote-Sensing Camera’s Principal Distance." Sensors 19, no. 5 (February 26, 2019): 990. http://dx.doi.org/10.3390/s19050990.

Full text

Abstract:

The instability of the principal distance of the nighttime light remote-sensing camera of the Luojia 1-01 satellite directly affects the geometric accuracy of images, consequently affecting the results of analysis of nighttime light remote-sensing data. Based on the theory of optical passive athermal design, a mathematical model of optical-passive athermal design for principal distance stabilization is established. Positive and negative lenses of different materials and the mechanical structures of different materials are matched to optimize the optical system. According to the index requirements of the Luojia 1-01 camera, an image-telecentric optical system was designed under the guidance of the established mathematical model. In the temperature range of −20 °C to +60 °C, the principal distance of the system changes from −0.01 μm to +0.28 μm. After on-orbit testing, the geometric accuracy of the designed nighttime light remote-sensing camera is better than 0.20 pixels and less than index requirement of 0.3 pixels, which indicating that the principal distance maintains good stability on-orbit and meets the application requirements of nighttime light remote sensing.

APA, Harvard, Vancouver, ISO, and other styles

18

Peng, Junzheng, Meng Wang, Dingnan Deng, Xiaoli Liu, Yongkai Yin, and Xiang Peng. "Distortion correction for microscopic fringe projection system with Scheimpflug telecentric lens." Applied Optics 54, no. 34 (November 25, 2015): 10055. http://dx.doi.org/10.1364/ao.54.010055.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Thomas, A., and M. Oldham. "Fast, large field-of-view, telecentric optical-CT scanning system for 3D radiochromic dosimetry." Journal of Physics: Conference Series 250 (November 1, 2010): 012007. http://dx.doi.org/10.1088/1742-6596/250/1/012007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Mei, Qing, Jian Gao, Hui Lin, Yun Chen, He Yunbo, Wei Wang, Guanjin Zhang, and Xin Chen. "Structure light telecentric stereoscopic vision 3D measurement system based on Scheimpflug condition." Optics and Lasers in Engineering 86 (November 2016): 83–91. http://dx.doi.org/10.1016/j.optlaseng.2016.05.021.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Pan Bing, 潘兵, 俞立平 Yu Liping, and 吴大方 Wu Dafang. "High-Accuracy Two-Dimensional Digital Image Correlation Measurement System Using a Bilateral Telecentric Lens." Acta Optica Sinica 33, no. 4 (2013): 0412004. http://dx.doi.org/10.3788/aos201333.0412004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Yoshida, M., Kazuhisa Yanagi, M. H. Hafiz, and M. Hara. "Automatic Inspection System for Grain Size Distribution Using a Commercial Grind Gauge." Key Engineering Materials 381-382 (June 2008): 323–24. http://dx.doi.org/10.4028/www.scientific.net/kem.381-382.323.

Full text

Abstract:

Grind gauge is a measuring tool for size of grains or particles included in paint or ink. Its geometrical specifications and operational procedure are regulated to some extent and partly standardized in both ISO and JIS. However, only skilled technician can manage to handle it properly and to obtain correct measurement results. The objective of this study is to develop an automatic inspection system for the grain or particle size by use of artificial lighting and CCD camera with image processing techniques. A telecentric lens system was constructed and high resolution CCD camera was attached to it. Advantages of coaxial illumination and oblique illumination methods were revealed and their applicability was examined respectively. The optical configuration to cover the scale and the whole groove width of grind gauge was devised so that the captured image data could contain both grain/particle distribution and height location. A proper software program followed by image processing algorithm was established to reveal particle mark and liner mark.

APA, Harvard, Vancouver, ISO, and other styles

23

Hu, Yan, Qian Chen, Shijie Feng, Tianyang Tao, Anand Asundi, and Chao Zuo. "A new microscopic telecentric stereo vision system - Calibration, rectification, and three-dimensional reconstruction." Optics and Lasers in Engineering 113 (February 2019): 14–22. http://dx.doi.org/10.1016/j.optlaseng.2018.09.011.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Beermann, Rüdiger, Lorenz Quentin, Markus Kästner, and Eduard Reithmeier. "Calibration routine for a telecentric stereo vision system considering affine mirror ambiguity." Optical Engineering 59, no. 05 (May 26, 2020): 1. http://dx.doi.org/10.1117/1.oe.59.5.054104.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Kawamura, Marenori, Takumi Sano, and Susumu Sato. "Cell-parameter measurement system for a liquid-crystal cell by using a telecentric lens." Journal of the Society for Information Display 17, no. 10 (2009): 833. http://dx.doi.org/10.1889/jsid17.10.833.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Dong, Bo, Chenzhuo Li, and Bing Pan. "Ultrasensitive video extensometer using single-camera dual field-of-view telecentric imaging system." Optics Letters 44, no. 18 (September 10, 2019): 4499. http://dx.doi.org/10.1364/ol.44.004499.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Liu Jun, 刘军, 黄玮 Huang Wei, 许伟才 Xu Weicai, and 徐明飞 Xu Mingfei. "Optical Design of the Off-Axis Three-Mirror Reflective Telecentric System with Wide Field of View." Laser & Optoelectronics Progress 51, no. 12 (2014): 122203. http://dx.doi.org/10.3788/lop51.122203.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Guo, Shu Xia, Bin Feng, Liang Zhang, Wei Zhang, and Lei Wang. "Eccentricity Measurement of Auto-Hub's Pitch Circle." Applied Mechanics and Materials 431 (October 2013): 121–25. http://dx.doi.org/10.4028/www.scientific.net/amm.431.121.

Full text

Abstract:

In order to measure the eccentricity of auto-hubs center hole and bolt holes, a machine vision system is proposed in this article. Instead of normally used telecentric lens, a perspective lens is used in the vision system because of the large field of view. The eccentricity is calculated by sub-pixel edge extracting and circle-fitting algorithm. A correction method is put forward to compensate the systematic error resulting from the different perspective distortions of the center hole and the bolt holes because of the height difference between the center hole and the bolt holes, as well as the offset between the hubs center shaft and the optical axis of the imaging system. The maximum variation and the standard variation are calculated to analyze the measurement uncertainty. Experiments had shown that the maximum variation and the standard deviation of the corrected measured eccentricity were reduced to 1/6 and 1/8 of those without correction.

APA, Harvard, Vancouver, ISO, and other styles

29

Liu Xiaomei, 刘晓梅, and 向阳 Xiang Yang. "Design of Telecentric Off-Axis Three-Mirror System of Imaging Spectrometer with Wide Field-of-View." Acta Optica Sinica 31, no. 6 (2011): 0622004. http://dx.doi.org/10.3788/aos201131.0622004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Zhang, Shaohui, Guocheng Zhou, Ying Wang, Yao Hu, and Qun Hao. "A Simply Equipped Fourier Ptychography Platform Based on an Industrial Camera and Telecentric Objective." Sensors 19, no. 22 (November 11, 2019): 4913. http://dx.doi.org/10.3390/s19224913.

Full text

Abstract:

Fourier ptychography microscopy (FPM) is a recently emerged computational imaging method, which combines the advantages of synthetic aperture and phase retrieval to achieve super-resolution microscopic imaging. FPM can bypass the diffraction limit of the numerical aperture (NA) system and achieve complex images with wide field of view and high resolution (HR) on the basis of the existing microscopic platform, which has low resolution and wide field of view. Conventional FPM platforms are constructed based on basic microscopic platform and a scientific complementary metal–oxide–semiconductor (sCMOS) camera, which has ultrahigh dynamic range. However, sCMOS, or even the microscopic platform, is too expensive to afford for some researchers. Furthermore, the fixed microscopic platform limits the space for function expansion and system modification. In this work, we present a simply equipped FPM platform based on an industrial camera and telecentric objective, which is much cheaper than sCMOS camera and microscopic platform and has accurate optical calibration. A corresponding algorithm was embedded into a conventional FP framework to overcome the low dynamic range of industrial cameras. Simulation and experimental results showed the feasibility and good performance of the designed FPM platform and algorithms.

APA, Harvard, Vancouver, ISO, and other styles

31

Zhang, Lu. "Design of an optical system consisting of a special telecentric lens for side-scattering measurement on individual cells." Optical Engineering 49, no. 5 (May 1, 2010): 053001. http://dx.doi.org/10.1117/1.3425657.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Fang, Xia, Wang Jie, and Tao Feng. "An Industrial Micro-Defect Diagnosis System via Intelligent Segmentation Region." Sensors 19, no. 11 (June 11, 2019): 2636. http://dx.doi.org/10.3390/s19112636.

Full text

Abstract:

In the field of machine vision defect detection for a micro workpiece, it is very important to make the neural network realize the integrity of the mask in analyte segmentation regions. In the process of the recognition of small workpieces, fatal defects are always contained in borderline areas that are difficult to demarcate. The non-maximum suppression (NMS) of intersection over union (IOU) will lose crucial texture information especially in the clutter and occlusion detection areas. In this paper, simple linear iterative clustering (SLIC) is used to augment the mask as well as calibrate the score of the mask. We propose an SLIC head of object instance segmentation in proposal regions (Mask R-CNN) containing a network block to learn the quality of the predict masks. It is found that parallel K-means in the limited region mechanism in the SLIC head improved the confidence of the mask score, in the context of our workpiece. A continuous fine-tune mechanism was utilized to continuously improve the model robustness in a large-scale production line. We established a detection system, which included an optical fiber locator, telecentric lens system, matrix stereoscopic light, a rotating platform, and a neural network with an SLIC head. The accuracy of defect detection is effectively improved for micro workpieces with clutter and borderline areas.

APA, Harvard, Vancouver, ISO, and other styles

33

CALCINES, A., R. L. LÓPEZ, and M. COLLADOS. "MuSICa: THE MULTI-SLIT IMAGE SLICER FOR THE EST SPECTROGRAPH." Journal of Astronomical Instrumentation 02, no. 01 (September 2013): 1350009. http://dx.doi.org/10.1142/s2251171713500098.

Full text

Abstract:

Integral field spectroscopy (IFS) is a technique that allows one to obtain the spectra of all the points of a bidimensional field of view simultaneously. It is being applied to the new generation of the largest night-time telescopes but it is also an innovative technique for solar physics. This paper presents the design of a new image slicer, MuSICa (Multi-Slit Image slicer based on collimator-Camera), for the integral field spectrograph of the 4-m aperture European Solar Telescope (EST). MuSICa is a multi-slit image slicer that decomposes an 80 arcsec2 field of view into slices of 50 μm and reorganizes it into eight slits of 0.05 arcsec width × 200 arcsec length. It is a telecentric system with an optical quality at diffraction limit compatible with the two modes of operation of the spectrograph: spectroscopic and spectro-polarimetric. This paper shows the requirements, technical characteristics and layout of MuSICa, as well as other studied design options.

APA, Harvard, Vancouver, ISO, and other styles

34

Tao, Xiaodong, Hyungsuck Cho, and Farrokh Janabi-Sharifi. "Optical design of a variable view imaging system with the combination of a telecentric scanner and double wedge prisms." Applied Optics 49, no. 2 (January 8, 2010): 239. http://dx.doi.org/10.1364/ao.49.000239.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Chen, Pin-Chuan, Ya-Ting Lin, Chi-Minh Truong, Pai-Shan Chen, and Huihua-Kenny Chiang. "Development of an Automated Optical Inspection System for Rapidly and Precisely Measuring Dimensions of Embedded Microchannel Structures in Transparent Bonded Chips." Sensors 21, no. 3 (January 20, 2021): 698. http://dx.doi.org/10.3390/s21030698.

Full text

Abstract:

This study aimed to develop an automated optical inspection (AOI) system that can rapidly and precisely measure the dimensions of microchannels embedded inside a transparent polymeric substrate, and can eventually be used on the production line of a factory. The AOI system is constructed based on Snell’s law. The concept holds that, when light travels through two transparent media (air and the microfluidic chip transparent material), by capturing the parallel refracted light from a light source that went through the microchannel using a camera with a telecentric lens, the image can be analyzed using formulas derived from Snell’s law to measure the dimensions of the microchannel cross-section. Through the NI LabVIEW 2018 SP1 programming interface, we programmed this system to automatically analyze the captured image and acquire all the needed data. The system then processes these data using custom-developed formulas to calculate the height and width measurements of the microchannel cross-sections and presents the results on the human–machine interface (HMI). In this study, a single and straight microchannel with a cross-sectional area of 300 μm × 300 μm and length of 44 mm was micromachined and sealed with another polymeric substrate by a solvent bonding method for experimentations. With this system, 45 cross-sectional areas along the straight microchannel were measured within 20 s, and experiment results showed that the average measured error was less than 2%.

APA, Harvard, Vancouver, ISO, and other styles

36

Tsai, Cheng-Mu, Tzu-Chyang King, Yi-Chin Fang, Nai-Wie Hsueh, and Che-Wei Lin. "Optical Design for Novel Glasses-Type 3D Wearable Ophthalmoscope." Applied Sciences 9, no. 4 (February 19, 2019): 717. http://dx.doi.org/10.3390/app9040717.

Full text

Abstract:

This paper proposes a new optical design that will cooperate with 3D image technology, infrared spectrum technology, future medical diagnostics, the cloud, and big data analysis. We first conducted image recognition experiments to compare the pros and cons of 2D and 3D frameworks in order to make sure that the optical and mechanical framework of a glasses-type 3D ophthalmoscope would be a better choice. The experimental results showed that a 3D image recognition rate (90%) was higher than a 2D image recognition rate (84%), and hence the 3D mechanism design was selected. The glasses-type 3D ophthalmoscope design is primarily based on the specification of indirect ophthalmoscope requirements and two working spectrums: a near infrared and a visible spectrum. The design is a 2.5x magnification fixed focal telecentric relay system with a right-angle prism, which uses a large aperture to increase the amount of incident light (F/# = 2.0). As the infrared spectrums that have better transmittance towards human eye tissue are 965 nm and 985 nm, so that we took account of the visible spectrum and the near-infrared spectrum simultaneously to increase the basis of the physician’s diagnosis. In this research, we conclude that a wearable ophthalmoscope can be designed optically and mechanically with 3D technology, an infrared and a visible working spectrum and further, possibly in cooperation with the cloud and big data analysis.

APA, Harvard, Vancouver, ISO, and other styles

37

Suwaki, Caroline H., Leandro T. De-La-Cruz, and Rubens M. Lopes. "Impacts of Microplastics on the Swimming Behavior of the Copepod Temora turbinata (Dana, 1849)." Fluids 5, no. 3 (June 30, 2020): 103. http://dx.doi.org/10.3390/fluids5030103.

Full text

Abstract:

Zooplankton are prone to the ingestion of microplastics by mistaking them for prey. However, there is a lack of knowledge about the impacts of microplastic availability on zooplankton behavior. In this study, we investigated the effects of polystyrene microbeads on swimming patterns of the calanoid copepod Temora turbinata under laboratory conditions. We acquired high-resolution video sequences using an optical system containing a telecentric lens and a digital camera with an acquisition rate of 20 frames per second. We estimated the mean speed, NGDR (Net-to-Gross Displacement Ratio, a dimensionless single-valued measure of straightness) and turning angle to describe the swimming behavior in three different treatments (control, low and high concentration of microplastics). Our results revealed that swimming speeds decreased up to 40% (instantaneous speed) compared to controls. The NGDR and turning angle distribution of the organisms also changed in the presence of polystyrene microbeads, both at low (100 beads mL−1) and high microplastic concentration (1000 beads mL−1). These results suggest that the swimming behavior of Temora turbinata is affected by microbeads.

APA, Harvard, Vancouver, ISO, and other styles

38

Yasuda, Satoshi, Don N. Futaba, Motoo Yumura, Sumio Iijima, and Kenji Hata. "Diagnostics and growth control of single-walled carbon nanotube forests using a telecentric optical system for in situ height monitoring." Applied Physics Letters 93, no. 14 (October 6, 2008): 143115. http://dx.doi.org/10.1063/1.2987480.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

OTA, Masanori, and Kazuo MAENO. "0406 Introducing Telecentric Optical System to Quantitative Density Measurement of Supersonic Flow by Colored-Grid Background Oriented Schlieren(CGBOS)Technique." Proceedings of the Fluids engineering conference 2012 (2012): 201–2. http://dx.doi.org/10.1299/jsmefed.2012.201.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Yuan, Y., Z. Liu, X. Zheng, Q. Kang, H. Wu, J. Li, S. Li, D. Luo, and J. Hong. "POLARIMETRIC CALIBRATION OF THE SPACEBORNE DIRECTIONAL POLARIMETRIC CAMERA INSTALLED ON THE GF-5 SATELLITE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B1-2020 (August 6, 2020): 599–606. http://dx.doi.org/10.5194/isprs-archives-xliii-b1-2020-599-2020.

Full text

Abstract:

Abstract. The Spaceborne Directional Polarimetric Camera (SDPC) is dedicated to obtain an accurate information of clouds and microphysical properties of aerosol particles via multi-angle, multi-spectral and multi-polarization observations. It images the Earth with 110° field of view (FOV) in 3 polarimetric spectral bands and 5 non-polarimetric spectral bands from visible to near infrared. Due to its wide FOV telecentric optical system and multi-channels, polarization sensitivity of optical components (PSOC) and non-uniform response of pixels (NURP) are the main uncertainty factors of polarimetric calibration.In this paper, a polarimetric calibration model of SDPC has been constructed for increasing the measurement accuracy. Combined an integrating sphere with a polarization generator as source, PSOC can be measured in high accuracy by using the Fourier series analysis method which reduces the impact form the alignment error of the generator. The sectional viewing field measurement method is used to acquire NURP while the large aperture integrating sphere served as reference source. Subsequently, the data of NURP have been corrected by the relative transmittance of high frequency and low frequency respectively for polarized channels. The result of validation experiment shows that the polarization measurement errors in 0°, 15°, 30°, and 45° half field of view (HFOV) are all less than 0.5% when the degree of linear polarization of reference source is larger than 0.1.

APA, Harvard, Vancouver, ISO, and other styles

41

Scharmer, G. B., M. G. Löfdahl, G. Sliepen, and J. de la Cruz Rodríguez. "Is the sky the limit?" Astronomy & Astrophysics 626 (June 2019): A55. http://dx.doi.org/10.1051/0004-6361/201935735.

Full text

Abstract:

We discuss the use of measurements of the solar granulation contrast as a measure of optical quality. We demonstrate that for data recorded with a telescope that uses adaptive optics and/or post-processing to compensate for many low- and high-order aberrations, the RMS granulation contrast is directly proportional to the Strehl ratio calculated from the residual (small-scale) wavefront error (static and/or from seeing). We demonstrate that the wings of the high-order compensated point spread function for the Swedish 1-m Solar Telescope (SST) are likely to extend to a radius of not more than about 2″, which is consistent with earlier conclusions drawn from stray-light compensation of sunspot images. We report on simultaneous measurements of seeing and solar granulation contrast averaged over 2 s time intervals at several wavelengths from 525 nm to 853.6 nm on the red-beam (CRISP beam) and wavelengths from 395 nm to 484 nm on the blue-beam (CHROMIS beam). These data were recorded with the SST, which has been revamped with an 85-electrode adaptive mirror and a new tip-tilt mirror, both of which were polished to exceptionally high optical quality. Compared to similar data obtained with the previous 37-electrode adaptive mirror in 2009 and 2011, there is a significant improvement in image contrast. The highest 2 s average image contrasts measured in April 2015 through 0.3−0.9 nm interference filters at 525 nm, 557 nm, 630 nm, and 853.5 nm with compensation only for the diffraction limited point spread function of SST are 11.8%, 11.8%, 10.2%, and 7.2%, respectively. Similarly, the highest 2 s contrasts measured at 395 nm, 400 nm, and 484 nm in May 2016 through 0.37−1.3 nm filters are 16%, 16%, and 12.5%, respectively. The granulation contrast observed with SST compares favorably to measured values with SOT on Hinode and with Sunrise as well as major ground-based solar telescopes. Simultaneously with the above wideband red-beam data, we also recorded narrowband continuum images with the CRISP imaging spectropolarimeter. We find that contrasts measured with CRISP are entirely consistent with the corresponding wideband contrasts, demonstrating that any additional image degradation by the CRISP etalons and telecentric optical system is marginal or even insignificant. Finally, we discuss the origin of the 48 nm RMS wavefront error needed to bring consistency between the measured granulation contrast and that obtained from 3D simulations of convection.

APA, Harvard, Vancouver, ISO, and other styles

42

Wu, Lifu, Jianguo Zhu, Huimin Xie, and Mengmeng Zhou. "Single-lens 3D digital image correlation system based on a bilateral telecentric lens and a bi-prism: Systematic error analysis and correction." Optics and Lasers in Engineering 87 (December 2016): 129–38. http://dx.doi.org/10.1016/j.optlaseng.2016.02.006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Robert, V., J. Desmars, V. Lainey, J. E. Arlot, A. C. Perlbarg, D. Horville, J. Aboudarham, et al. "The NAROO digitization center." Astronomy & Astrophysics 652 (July 30, 2021): A3. http://dx.doi.org/10.1051/0004-6361/202140472.

Full text

Abstract:

The New Astrometric Reduction of Old Observations (NAROO) center can be found at the Paris Observatory in Meudon, and it is dedicated to the measurement of astrophotographic plates and the analysis of old observations. The NAROO digitizer consists of a granite-based Newport-Microcontrol open-frame air-bearing XY positioning table, a scientific sCMOS camera, and a telecentric optical system. The plate holder assembly is suited for mounting glass plates up to 350 mm squared. The machine positioning stability is better than 15 nm, and its repeatability is better than 40 nm. With real photographic plate data, we were able to produce measurements with an accuracy better than 65 nm. The renewed interest about photographic plates concerns the expansion of the database of transient objects evolving in time, since digitization now makes it possible to measure images with a high level of accuracy and to identify all the available objects. The information extracted from such materials can be of an astrometric, photometric, and spectroscopic nature, when not purely imaging, with consequences in planetology, near-Earth asteroid risk assessment, astrophysical phenomena, and general relativity, to mention but a few. Through our scientific program in the Gaia era, we detail examples of current and upcoming uses for the community. We invite researchers to use our facilities and digitize their collection by answering our call for proposals.

APA, Harvard, Vancouver, ISO, and other styles

44

Sukumaran, Sumitra M., Benjamin Potsaid, Moo-Yeal Lee, Douglas S. Clark, and Jonathan S. Dordick. "Development of a Fluorescence-Based, Ultra High-Throughput Screening Platform for Nanoliter-Scale Cytochrome P450 Microarrays." Journal of Biomolecular Screening 14, no. 6 (June 12, 2009): 668–78. http://dx.doi.org/10.1177/1087057109336592.

Full text

Abstract:

Cytochrome P450 enzyme (CYP450s) assays are critical enzymes in early-stage lead discovery and optimization in drug development. Currently available fluorescence-based reaction assays provide a rapid and reliable method for monitoring CYP450 enzyme activity but are confined to medium-throughput well-plate systems. The authors present a high-throughput, integrated screening platform for CYP450 assays combining enzyme encapsulation techniques, microarraying methods, and wide-field imaging. Alginate-containing microarrays consisting of up to 1134 CYP450 reaction elements were fabricated on functionalized glass slides (reaction volumes 20 to 80 nL, total enzyme content in pg) and imaged to yield endpoint activity, stability, and kinetic data. A charge-coupled device imager acquired quantitative, high-resolution images of a 20 × 20 mm area/snapshot using custom-built wide-field optics with telecentric lenses and easily interchangeable filter sets. The imaging system offered a broad dynamic intensity range (linear over 3 orders of magnitude) and sensitivity down to fluorochrome quantities of <5 fmols, with read accuracy similar to a laser scanner or a fluorescence plate reader but with higher throughput. Rapid image acquisition enabled analysis of CYP450 kinetics. Fluorogenic assays with CYP3A4, CYP2C9, and CYP2D6 on the alginate microarrays exhibited Z′ factors ranging from 0.75 to 0.85, sensitive detection of inhibitory compounds, and reactivity comparable to that in solution, thereby demonstrating the reliability and accuracy of the microarray platform. This system enables for the first time a significant miniaturization of CYP enzyme assays with significant conservation of assay reagents, greatly increased throughput, and no apparent loss of enzyme activity or assay sensitivity. ( Journal of Biomolecular Screening 2009:668-678)

APA, Harvard, Vancouver, ISO, and other styles

45

Loosen, Florian, Norbert Lindlein, and Klaus Donner. "Telecentric line scanning system based on a ring surface mirror for inline processes." Advanced Optical Technologies 5, no. 3 (January 1, 2016). http://dx.doi.org/10.1515/aot-2016-0010.

Full text

Abstract:

AbstractIn many industrial applications, an inline measurement of a production process poses a difficult challenge for any optical system. Therefore, telecentric optical systems are being used to ensure an independence of the magnification of the object from the working distance. Usually, telecentric optical systems are impractical for inline applications with large objects due to the size of the telecentric optical system, which has to be larger than the object. Therefore, a new approach of telecentric line scanning systems was developed to gain access to this advantage.

APA, Harvard, Vancouver, ISO, and other styles

46

"Projection optical system with telecentric beam path for aircraft on-board indicators." Оптический журнал, 2020. http://dx.doi.org/10.17586/1023-5086-2020-87-08-41-49.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Meyer, Johannes, Thomas Längle, and Jürgen Beyerer. "About acquiring and processing light transport matrices for transparent object inspection." tm - Technisches Messen 83, no. 12 (January 28, 2016). http://dx.doi.org/10.1515/teme-2016-0042.

Full text

Abstract:

AbstractTransparent materials are employed for creating different kinds of products and have to meet high quality requirements. First of all, transparent materials have to be free from scattering defects, e.g., enclosed air bubbles. Visual inspection systems based on dark field setups are principally capable of imaging these kinds of defects, however, it usually requires much effort to adapt them to the test object on hand. This article shows how light transport matrices can be calculated for an optical system consisting of a programmable area light source and a telecentric camera. Two features are proposed that can be extracted out of these matrices and that allow to image scattering defects present in a transparent object without the need of adapting the system to the actual test object. The results of synthetic experiments obtained using a physically based and adequately extended rendering framework approved the proposed approach and showed that it even outperforms classical inspection systems in some situations.

APA, Harvard, Vancouver, ISO, and other styles

48

Ota, Masanori, Friedrich Leopold, Ryusuke Noda, and Kazuo Maeno. "Improvement in spatial resolution of background-oriented schlieren technique by introducing a telecentric optical system and its application to supersonic flow." Experiments in Fluids 56, no. 3 (February 19, 2015). http://dx.doi.org/10.1007/s00348-015-1919-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!