In the traditional PMP calibration, the system calibration and phase measurement were performed dividedly, and the measurement result was the relative height to the reference plane. A fast calibration was proposed, in which two gauge blocks were used to replace the standard plane controlled by the mechanical shifting device in the traditional calibration, and fewer datum points were sampled from the surface of the gauge blocks to calibrate the system. With this method, both system calibration and phase measurement can be implemented simultaneously. The real height of the object relative to the supporting plane can be obtained when the supporting plane was not superposed on the reference. A cuboid block of normal height 14.00mm was successfully measured by this method. Its mean relative error was no more than 1.35% and the root-mean-square error was less than 0.15mm. The calibration of the PMP was simplified and became more flexible with the proposed method.
{"title":"A fast and practical calibration method for the phase measuring profilometry","authors":"Lei Wu, Yanshan Xiao, Zi-wei Liu, Longfei Han","doi":"10.1117/12.2181806","DOIUrl":"https://doi.org/10.1117/12.2181806","url":null,"abstract":"In the traditional PMP calibration, the system calibration and phase measurement were performed dividedly, and the measurement result was the relative height to the reference plane. A fast calibration was proposed, in which two gauge blocks were used to replace the standard plane controlled by the mechanical shifting device in the traditional calibration, and fewer datum points were sampled from the surface of the gauge blocks to calibrate the system. With this method, both system calibration and phase measurement can be implemented simultaneously. The real height of the object relative to the supporting plane can be obtained when the supporting plane was not superposed on the reference. A cuboid block of normal height 14.00mm was successfully measured by this method. Its mean relative error was no more than 1.35% and the root-mean-square error was less than 0.15mm. The calibration of the PMP was simplified and became more flexible with the proposed method.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114704275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Congjie Yang, Zhiyuan Gao, Xinji Zeng, S. Yao, Jing Gao
This paper presents a non-destructive readout circuit of the linear array image sensor with wide dynamic range and high speed readout for radar system. A multi-capacitor and self-regulated capacitive trans-impedance amplifier (CTIA) structure is employed to extend the dynamic range. The gain of the CTIA is auto adjusted by switching different capacitors to the integration node asynchronously according to the output voltage. A class AB OPA is utilized to drive all the additional capacitors to achieve high speed readout. A photo response curve presents as a polyline with 5 segments, which enables a 101.7 dB dynamic range. In addition, the exposure time is 5.12us in the simulation, then an over 190k fps is achieved.
{"title":"A non-destructive readout circuit of the linear array image sensor with over 90dB dynamic range and 190k fps for radar system","authors":"Congjie Yang, Zhiyuan Gao, Xinji Zeng, S. Yao, Jing Gao","doi":"10.1117/12.2182154","DOIUrl":"https://doi.org/10.1117/12.2182154","url":null,"abstract":"This paper presents a non-destructive readout circuit of the linear array image sensor with wide dynamic range and high speed readout for radar system. A multi-capacitor and self-regulated capacitive trans-impedance amplifier (CTIA) structure is employed to extend the dynamic range. The gain of the CTIA is auto adjusted by switching different capacitors to the integration node asynchronously according to the output voltage. A class AB OPA is utilized to drive all the additional capacitors to achieve high speed readout. A photo response curve presents as a polyline with 5 segments, which enables a 101.7 dB dynamic range. In addition, the exposure time is 5.12us in the simulation, then an over 190k fps is achieved.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121888686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In DPSK communication system, the traditional way for bias voltage is loading a fixed bias voltage on the electro-optic modulator. For the influence of the temperature changes, the half-wave voltage of the electro-optic modulator may change and the DC bias supply voltage will have a certain degree of random fluctuations at the meantime which will cause the DC bias point of the modulator drift and consequently the communication systems are affected. To enhance the stability of the DPSK optical communication system and control the bias of Mach-Zehnder electro-optic modulators automatically, a PID control method has been proposed in this paper. After the actual operation, a DPSK signal transmission with transfer rate of 5Gb/s is built. Using the complex spectrum analyzer, stable signal and the constellation can be received. The automatic control system basically meets the needs of the DPSK transmission system of high stability, high accuracy and capacity of resisting disturbance.
{"title":"Automatic bias control system of high speed electro-optic modulator in DPSK Systems","authors":"Miao Xu, S. Tong, Dashuai Wang","doi":"10.1117/12.2179435","DOIUrl":"https://doi.org/10.1117/12.2179435","url":null,"abstract":"In DPSK communication system, the traditional way for bias voltage is loading a fixed bias voltage on the electro-optic modulator. For the influence of the temperature changes, the half-wave voltage of the electro-optic modulator may change and the DC bias supply voltage will have a certain degree of random fluctuations at the meantime which will cause the DC bias point of the modulator drift and consequently the communication systems are affected. To enhance the stability of the DPSK optical communication system and control the bias of Mach-Zehnder electro-optic modulators automatically, a PID control method has been proposed in this paper. After the actual operation, a DPSK signal transmission with transfer rate of 5Gb/s is built. Using the complex spectrum analyzer, stable signal and the constellation can be received. The automatic control system basically meets the needs of the DPSK transmission system of high stability, high accuracy and capacity of resisting disturbance.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134319675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to analyze the tank characteristic in infrared thermal image quantitatively, an extraction method of tank characteristic quantities in infrared thermal images by using MATLAB was discussed, and a group of characteristic quantities which identified tank in infrared thermal image were summarized. By calculating and processing infrared thermal image of tank which was created by simulation, the results showed that the characteristic quantities which were extracted using this method can described tank feature in infrared thermal image roundly, and provided the study foundation for target recognition technology development.
{"title":"An extraction method of the tank characteristic quantities in infrared thermal images","authors":"Kunpeng Zheng, Zhenbiao Wei, Yonghe Chen","doi":"10.1117/12.2087201","DOIUrl":"https://doi.org/10.1117/12.2087201","url":null,"abstract":"In order to analyze the tank characteristic in infrared thermal image quantitatively, an extraction method of tank characteristic quantities in infrared thermal images by using MATLAB was discussed, and a group of characteristic quantities which identified tank in infrared thermal image were summarized. By calculating and processing infrared thermal image of tank which was created by simulation, the results showed that the characteristic quantities which were extracted using this method can described tank feature in infrared thermal image roundly, and provided the study foundation for target recognition technology development.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132275847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Blind image deblurring is an important issue. In this paper, we focus on solving this issue by constrained regularization method. Motivated by the importance of edges to visual perception, the edge-enhancing indicator is introduced to constrain the total variation regularization, and the bilateral filter is used for edge-preserving smoothing. The proposed edge enhancing regularization method aims to smooth preferably within each region and preserve edges. Experiments on simulated and real motion blurred images show that the proposed method is competitive with recent state-of-the-art total variation methods.
{"title":"Blind image deblurring with edge enhancing total variation regularization","authors":"Yu Shi, Hanyu Hong, Jie Song, Xia Hua","doi":"10.1117/12.2180852","DOIUrl":"https://doi.org/10.1117/12.2180852","url":null,"abstract":"Blind image deblurring is an important issue. In this paper, we focus on solving this issue by constrained regularization method. Motivated by the importance of edges to visual perception, the edge-enhancing indicator is introduced to constrain the total variation regularization, and the bilateral filter is used for edge-preserving smoothing. The proposed edge enhancing regularization method aims to smooth preferably within each region and preserve edges. Experiments on simulated and real motion blurred images show that the proposed method is competitive with recent state-of-the-art total variation methods.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"19 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132532472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaojun Wang, Xin Zhang, Lijie Jin, J. Tong, Jie Gao, Zhaopeng Xu
The congruent Zr:Ce:Fe:LiNbO3 crystals have been grown by the Czochralski method with fixed concentrations of CeO2 and Fe2O3 and various concentrations of ZrO2. The Ultraviolet(UV)-Visible(Vis) absorption spectra were measured in order to investigate their defect structures and their optical damage resistance was characterized by the transmission light spot distortion method. The results show that the optical damage resistance of the Zr:Ce:Fe:LiNbO3 crystals improves with the doping concentration of ZrO2 increasing. The dependence of the optical damage resistance on the defect structure of Zr:Ce:Fe:LiNbO3 crystals was discussed.
{"title":"Defect structure and optical damage resistance of Zr:Ce:Fe:LiNbO3 crystals","authors":"Xiaojun Wang, Xin Zhang, Lijie Jin, J. Tong, Jie Gao, Zhaopeng Xu","doi":"10.1117/12.2181652","DOIUrl":"https://doi.org/10.1117/12.2181652","url":null,"abstract":"The congruent Zr:Ce:Fe:LiNbO3 crystals have been grown by the Czochralski method with fixed concentrations of CeO2 and Fe2O3 and various concentrations of ZrO2. The Ultraviolet(UV)-Visible(Vis) absorption spectra were measured in order to investigate their defect structures and their optical damage resistance was characterized by the transmission light spot distortion method. The results show that the optical damage resistance of the Zr:Ce:Fe:LiNbO3 crystals improves with the doping concentration of ZrO2 increasing. The dependence of the optical damage resistance on the defect structure of Zr:Ce:Fe:LiNbO3 crystals was discussed.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"279 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116295398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Currently, various types of III nitride-based materials have been successfully used for short-wavelength optoelectronic devices. The GaN ultraviolet detector has been wildly used for UV-Index(UVI) monitoring, UV curing and water disinfection. The global solar UVI describes the levels of solar UV radiation at the Earth’s surface. The higher the UVI value, the greater the potential damage to the skin and eyes. The UVI monitoring demonstrator board with GaN detector is briefly introduced in this paper.
{"title":"GaN ultraviolet detector based demonstrator board for UV-index monitoring","authors":"Man Song, F. Xie, Jun Wang, Tanglin Wang, Jin Guo","doi":"10.1117/12.2179752","DOIUrl":"https://doi.org/10.1117/12.2179752","url":null,"abstract":"Currently, various types of III nitride-based materials have been successfully used for short-wavelength optoelectronic devices. The GaN ultraviolet detector has been wildly used for UV-Index(UVI) monitoring, UV curing and water disinfection. The global solar UVI describes the levels of solar UV radiation at the Earth’s surface. The higher the UVI value, the greater the potential damage to the skin and eyes. The UVI monitoring demonstrator board with GaN detector is briefly introduced in this paper.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134400614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jian Chen, Ling-jiang Kong, F. Xiao, Zhenming Yang
The effect of random phase errors on coherent beam combining based on liquid crystal phased array is studied. Utilizing the Fraunhofer propagation principle and probability theory, the analytical expressions of the far-field intensity distribution functions of the output beam are derived. According to these expressions, it can be concluded that as the phase errors increase, the peak intensity of the combined beam in the far-field decreases, the main lobe width widens and the error of deflection angle becomes greater. Considering the influence of random phase errors on the three parameters, a threshold of phase control precision can be designated. When the phase errors are less than the threshold, the performance degradation of the CBC system caused by the phase errors can be accepted. The computer simulations illustrate that the conclusions obtained from analytical expressions are reasonable. In the simulation parameters, the threshold of the phase control precision is λ / 20. The results in this paper can be employed to research methods to reduce the adverse effects of random phase errors and can also be used to determine the phase control precision when using phase-locking algorithms to lock the phase of the beams to be combined in the CBC system.
{"title":"Effect of random phase errors on coherent beam combining based on liquid crystal phased array","authors":"Jian Chen, Ling-jiang Kong, F. Xiao, Zhenming Yang","doi":"10.1117/12.2178389","DOIUrl":"https://doi.org/10.1117/12.2178389","url":null,"abstract":"The effect of random phase errors on coherent beam combining based on liquid crystal phased array is studied. Utilizing the Fraunhofer propagation principle and probability theory, the analytical expressions of the far-field intensity distribution functions of the output beam are derived. According to these expressions, it can be concluded that as the phase errors increase, the peak intensity of the combined beam in the far-field decreases, the main lobe width widens and the error of deflection angle becomes greater. Considering the influence of random phase errors on the three parameters, a threshold of phase control precision can be designated. When the phase errors are less than the threshold, the performance degradation of the CBC system caused by the phase errors can be accepted. The computer simulations illustrate that the conclusions obtained from analytical expressions are reasonable. In the simulation parameters, the threshold of the phase control precision is λ / 20. The results in this paper can be employed to research methods to reduce the adverse effects of random phase errors and can also be used to determine the phase control precision when using phase-locking algorithms to lock the phase of the beams to be combined in the CBC system.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134320797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
When satellite is flying on the orbit for special task like solar flare observation, it requires knowing if the sub-satellite purview was in the ocean area. The relative position between sub-satellite point and the coastline is varying, so the observation condition need be judged in real time according to the current orbital elements. The problem is to solve the status of the relative position between the rectangle purview and the multi connected regions formed by the base data of coastline. Usually the Cohen-Sutherland algorithm is adopted to get the status. It divides the earth map to 9 sections by the four lines extended the rectangle sides. Then the coordinate of boundary points of the connected regions in which section should be confirmed. That method traverses all the boundary points for each judgement. In this paper, two algorithms are presented. The one is based on line-segments, another is based on dot-array. And the data preprocessing and judging procedure of the two methods are focused. The peculiarity of two methods is also analyzed. The method of line-segments treats the connected regions as a set of series line segments. In order to solve the problem, the terminals’ coordinates of the rectangle purview and the line segments at the same latitude are compared. The method of dot-array translates the whole map to a binary image, which can be equal to a dot array. The value set of the sequence pixels in the dot array is gained. The value of the pixels in the rectangle purview is judged to solve the problem. Those two algorithms consume lower soft resource, and reduce much more comparing times because both of them do not need traverse all the boundary points. The analysis indicates that the real-time performance and consumed resource of the two algorithms are similar for the simple coastline, but the method of dot-array is the choice when coastline is quite complicated.
{"title":"Discuss on the two algorithms of line-segments and dot-array for region judgement of the sub-satellite purview","authors":"H. Nie, Mingming Yang, Yajie Zhu, Peng Zhang","doi":"10.1117/12.2181964","DOIUrl":"https://doi.org/10.1117/12.2181964","url":null,"abstract":"When satellite is flying on the orbit for special task like solar flare observation, it requires knowing if the sub-satellite purview was in the ocean area. The relative position between sub-satellite point and the coastline is varying, so the observation condition need be judged in real time according to the current orbital elements. The problem is to solve the status of the relative position between the rectangle purview and the multi connected regions formed by the base data of coastline. Usually the Cohen-Sutherland algorithm is adopted to get the status. It divides the earth map to 9 sections by the four lines extended the rectangle sides. Then the coordinate of boundary points of the connected regions in which section should be confirmed. That method traverses all the boundary points for each judgement. In this paper, two algorithms are presented. The one is based on line-segments, another is based on dot-array. And the data preprocessing and judging procedure of the two methods are focused. The peculiarity of two methods is also analyzed. The method of line-segments treats the connected regions as a set of series line segments. In order to solve the problem, the terminals’ coordinates of the rectangle purview and the line segments at the same latitude are compared. The method of dot-array translates the whole map to a binary image, which can be equal to a dot array. The value set of the sequence pixels in the dot array is gained. The value of the pixels in the rectangle purview is judged to solve the problem. Those two algorithms consume lower soft resource, and reduce much more comparing times because both of them do not need traverse all the boundary points. The analysis indicates that the real-time performance and consumed resource of the two algorithms are similar for the simple coastline, but the method of dot-array is the choice when coastline is quite complicated.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125146851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Delong Yang, Xiuyan Chen, P. Gao, Ji Yu, Xue Sun, Xin Wang
The 45° beam splitting mirror plays a vital role on image quality in the Holographic system, in order to study the influence of environment temperature variation on the 45° beam splitting mirror in the Holographic system, finite element analysis method is used to simulate the anti-three through seven mirror deformation at 27℃, 28℃ and 29℃ temperature in theory. A new real-time monitoring and displaying photoelectric system for ambient temperature and beam splitting mirror distortion detection is designed to provide real-time temperature change and deformation detection , which is made up of laser speckle interferometer, chip temperature sensor, two-operational amplifier, MCU and LED indicator. And the out-plane displacement value measured in the experiment under the condition of temperature correspondingly are 406nm, 420nm and 427 nm. Finally, the relation equation of temperature and mirror deformation is established by the method of exponential equation fitting, which will provide preliminary theoretical and experimental reference for further research.
{"title":"Temperature sensor and display researched based on micro-deformation of beam splitting mirror in holographic system","authors":"Delong Yang, Xiuyan Chen, P. Gao, Ji Yu, Xue Sun, Xin Wang","doi":"10.1117/12.2180057","DOIUrl":"https://doi.org/10.1117/12.2180057","url":null,"abstract":"The 45° beam splitting mirror plays a vital role on image quality in the Holographic system, in order to study the influence of environment temperature variation on the 45° beam splitting mirror in the Holographic system, finite element analysis method is used to simulate the anti-three through seven mirror deformation at 27℃, 28℃ and 29℃ temperature in theory. A new real-time monitoring and displaying photoelectric system for ambient temperature and beam splitting mirror distortion detection is designed to provide real-time temperature change and deformation detection , which is made up of laser speckle interferometer, chip temperature sensor, two-operational amplifier, MCU and LED indicator. And the out-plane displacement value measured in the experiment under the condition of temperature correspondingly are 406nm, 420nm and 427 nm. Finally, the relation equation of temperature and mirror deformation is established by the method of exponential equation fitting, which will provide preliminary theoretical and experimental reference for further research.","PeriodicalId":225534,"journal":{"name":"Photoelectronic Technology Committee Conferences","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127468634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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