2016
2016
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Record 85 of
Title:Non-contact photoelectric angle measurement based on gyrorotor
Author(s):Wang, Xianhua(1); Jia, Sen(1); Gao, Limin(1); Xiao, Maosen(1); Wu, Yiming(1)Source: Zhongguo Jiguang/Chinese Journal of Lasers Volume: 43 Issue: 10 DOI: 10.3788/CJL201643.1004001 Published: October 10, 2016Abstract:A non-contact angle measurement method based on gyrorotor with periodical pattern surface is proposed. By using photoelectric sensors to detect the information from periodical pattern surface of gyrorotor, we can measure the deflection angle of gyrorotor in real time. The angle measurement principle and its device are introduced. By constructing three-dimensional geometrical models, the angle decoding algorithm of the angle measurement method is derived in detail, and the curves or the surfaces of the relationships between the gyrorotor's pattern surface information detected by photoelectric sensors and the angle deflections (calculated under the conditions that the gyrorotor is without deflection, with one-dimensional deflection and with two-dimensional deflection respectively) are obtained. The results show that the deflection angle and the deflection direction of gyrorotor can be measured by two photoelectric sensors in orthogonal directions, and the measurement values are unique and the measurement range of deflection angle is larger than 30°. This method can be used to measure angle deflection both in static and high-speed dynamic measurements. ? 2016, Chinese Lasers Press. All right reserved.Accession Number: 20164502995138 -
Record 86 of
Title:Integrated measurement system with galileo telescope combined with cylindrical lens
Author(s):Liu, Ai-Min(1,2); Gao, Li-Min(1); Xiao, Mao-Sen(1); Lu, Wei-Guo(1); Wang, Hai-Xia(1)Source: Guangzi Xuebao/Acta Photonica Sinica Volume: 45 Issue: 11 DOI: 10.3788/gzxb20164511.1112002 Published: November 1, 2016Abstract:To achieve azimuth and height measurement of a slowly moving point in a certain distance and wide field of view, a combined long-focal-length cylindrical lens measurement system was built. A point shape reticle, a long-focal-length optical system formed by a Galileo telescope combined with cylindrical lens and two orthogonal linear array CCD were utilized. There isn't a real middle image plane in the combined long-focal-length optical system with a relatively short optical length. The front part of the system is a Galileo telescope, and its focal power is approximate to 0. Within a measurement range, some parameters, such as the value of the angular magnification and diameter of the front part, should be properly selected, making the linear image from different field orthogonal to the two linear CCD. Through targeted lens system design optimization, proper selection of merit function, and tolerance analysis of the alignment and measurement principle, the acurracy of azimuth measurement of this system is less than ±2.5″, within field of view of 1.5°×1.5°, at the measurement distance of 10 m, additionally with relatiely small system length, and relatively loose tolerance. The proposed system can solve the problem of the limited size of light source cooperation target, making a low cost and large size photo-electronic detector. ? 2016, Science Press. All right reserved.Accession Number: 20164703047438 -
Record 87 of
Title:Analysis of ground-based detection ability of high altitude balloon in near space
Author(s):Jing, Nan(1,2); Li, Chuang(1); Pan, Yue(1,2); Zhong, Pei-Feng(1,2)Source: Guangzi Xuebao/Acta Photonica Sinica Volume: 45 Issue: 1 DOI: 10.3788/gzxb20164501.0104002 Published: January 1, 2016Abstract:Radiance model of detection system was built based on background radiation and radiation of high altitude balloon. The radiometric signal electrons in focal plane array produced by high attitude balloon in near space and background radiation were calculated precisely by considering the effects of atmosphere transmission, optical system imaging, detector and detector sampling. Then signal-to-noise ratio was deduced for high attitude balloon in near space. An atmospheric modeling tool, Modtran, was used to model radiance of self-emission, specular background reflection and diffuse background reflection. Radiation characteristic of balloon in complex atmospheric and the influence on optic-electronic equipment's SNR of specular reflectivity, diffuse reflectivity and integration time were analyzed. The research results indicate that the Visible-Near Infrared Ray (VIS-NIR) (0.6~2.4) detector can be used to detect balloon in sunshine and the Long Wave Infrared Ray (LWIR) (8~12) detector can be used to detect balloon in complex atmospheric. With the integral time of 0.25s, the specular reflectivity of 0.32 and the diffuse reflectivtiy of 0.68, or the integral time of 1s, the specular reflectivity of 0.43 and the diffuse reflectivtiy of 0.57, detection of high altitude balloon can easily been achieved. ? 2016, Science Press. All right reserved.Accession Number: 20160902037357 -
Record 88 of
Title:High accuracy three-dimensional attitude angle measuring device
Author(s):Sun, Guo-Yan(1,2); Gao, Li-Min(1); Bai, Jian-Ming(1); Yang, Dong-Lai(1); Pan, Liang(1)Source: Guangxue Jingmi Gongcheng/Optics and Precision Engineering Volume: 24 Issue: 5 DOI: 10.3788/OPE.20162405.0963 Published: May 1, 2016Abstract:A high accuracy measuring device and corresponding measuring method for three-dimensional attitude angles (yaw, pitch and roll) were designed based on an autocollimator and a coordinate rotary transfer matrix. The working principle and structural composition were introduced. A three-dimensional attitude angle measuring model was established and the theory algorithm by coordinate rotation matrix was derived based on the principle of autocollimation angle measurement. Then, the optical system was designed according to the demand of the measurement system. A single Field Programming Gate Array (FPGA) was used to implement double CMOS image sensor imaging, spot identifying, subdivision positioning, three-dimensional attitude angle calculation and rapid communication with a USB. To ensure the unity of the actual equipment parameter and design data, a high precision calibration method was researched for the three-dimensional attitude angle measuring device. Finally, three-dimensional attitude angles were tested to verify this measuring device, and the degrees and the factors affecting the angle measuring accuracy were analyzed as well. Calibration and experiment measurement results indicate that the measuring precisions of the yaw, pitch and roll angles for the measuring device are 2.2″, 2.5″ and 7.8″ respectively in view field of ±20'. It shows that the three-dimensional attitude angle measuring device has higher precision, simpler structure as well as stronger stabilization, and can be widely applied to engineering practices. ? 2016, Science Press. All right reserved.Accession Number: 20162502507691 -
Record 89 of
Title:Optical waveguides in Er3+/Yb3+-codoped silicate glasses fabricated by proton implantation
Author(s):Liu, Chun-Xiao(1); Fu, Li-Li(2); Zhu, Xu-Feng(3); Guo, Hai-Tao(4); Li, Wei-Nan(4); Lin, She-Bao(5); Wei, Wei(1)Source: Japanese Journal of Applied Physics Volume: 55 Issue: 7 DOI: 10.7567/JJAP.55.072601 Published: July 2016Abstract:In this work, a planar waveguide was fabricated by proton implantation in Er3+/Yb3+-codoped silicate glasses with energies of (500+550) keV and fluences of (1+2) × 1016 ions/cm2. The end-face coupling method was employed to determine whether the light could be confined in the waveguide or not. The prism coupling technique was applied to measure the guided mode spectrum and the intensity calculation method was used to construct the refractive index profile. With the profile, a near-field intensity distribution was calculated by the finite difference beam propagation method. The obtained results may be helpful in developing integrated optical devices. ? 2016 The Japan Society of Applied Physics.Accession Number: 20162702561143 -
Record 90 of
Title:BRDF measurement of matte coating and its application
Author(s):Zhao, Qing(1,2); Zhao, Jian-Ke(1); Xu, Liang(1); Liu, Feng(1); Li, Zhao-Hui(1,2)Source: Guangxue Jingmi Gongcheng/Optics and Precision Engineering Volume: 24 Issue: 11 DOI: 10.3788/OPE.20162411.2627 Published: November 1, 2016Abstract:To explore the scattering characteristics of the stray light on hood surface of a camera, the Bidirectional Reflectance Distribution Function(BRDF) of the matte coating(Z306) on a aluminium plate specimen was measured and modeled to suppress the stray light. The BRDF value of the specimen coated with matte coating Z306 at 0.65 μm was obtained. On the basis of the scattering characteristics of the specimen coated with matte coating Z306, the microfacet-based model suitable for roughness matte coating was selected and corrected. The corrected microfacet-based model was used to model and process the measurement data and to obtain the BRDF data of the specimen in the whole hemisphere space to make up the defects of the less data and measurement errors. The BRDF data of the matte coating was induced to the software to analyze the stray light of an optical system and to compare the performance with the results of the stray light measurement. It shows that after the measurement data are processed by the correction microfacet-based model, the analysis results of the stray light have high consistency with the measurement results of the stray light, and the logarithm value of the ratio of tested value and analyzed value is less than 0.5. The results demonstrate that the BRDF model is necessary and the data processing is accurate, which provides an important method for stray light suppression in optical systems. ? 2016, Science Press. All right reserved.Accession Number: 20165103150087 -
Record 91 of
Title:Comparative analysis on PMSM control system based on SPWM and SVPWM
Author(s):Li, Bo(1,2); Wang, Chen(1)Source: Proceedings of the 28th Chinese Control and Decision Conference, CCDC 2016 Volume: Issue: DOI: 10.1109/CCDC.2016.7531902 Published: August 3, 2016Abstract:This paper firstly introduces the principles of SPWM (space vector pulse width modulation) and SVPWM (sinusoidal pulse width modulation), and then builds PMSM (permanent magnet synchronous motor) control system simulation models based on SPWM and SVPWM in MATLAB/Simulink environment. Finally, by comparing the simulation results of the two models, we got the advantages and disadvantages of SPWM and SVPWM. ? 2016 IEEE.Accession Number: 20163602766214 -
Record 92 of
Title:Detector for space thermalion imaging
Author(s):Li, Lin-Sen(1,2); Liu, Yong-An(1); Kong, Ling-Gao(3); Liu, Duo(1,2); Qiang, Peng-Fei(1); Zhao, Bao-Sheng(1)Source: Guangzi Xuebao/Acta Photonica Sinica Volume: 45 Issue: 4 DOI: 10.3788/gzxb20164504.0423007 Published: April 1, 2016Abstract:A kind of space thermal-ion imaging detector was investigated, which can be used in detecting a variety oftargetsource such as thermion, ultraviolet, X-rays etc. The output of the detector is a grayscale image of the target source, the detail information including the gradation level and gradation distribution of the image are obtained based on the intensity and thermal-ion uniformity of the target source. This paper conducted experiments to test the detector with target source of ultraviolet light. Performance parameters as follows have been detected; the resolution is better than 120 μm; the input-output linearity error is ? 2016, Chinese Optical Society. All right reserved.Accession Number: 20161902355975 -
Record 93 of
Title:Point cloud boundary detection in preprocessor of optical-mechanical integrated simulation
Author(s):Xu, Guangzhou(1,2); Ruan, Ping(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 45 Issue: 4 DOI: 10.3788/IRLA201645.0428001 Published: April 25, 2016Abstract:To resolve the data processing problem of point cloud for optical surface in general interface of optical-mechanical integrated simulation, the surface data processing method based on point cloud boundary detection was presented. First, the surface data preprocessing method in integrated simulation was discussed and effect of boundary detection in surface preprocessing data was also referred. Then, boundary detection algorithm referring to several techniques was researched including the data organization of point cloud, the small tangential plane fitting algorithm of the K-nearest neighbor node and the judgment of boundary node. Based on the research of point cloud boundary detection algorithm, the primary data structure and the program realization was discussed and by the extraction of demonstrated surface point cloud, the algorithm of boundary detection was proved to be right and effective. The algorithm of boundary detection provides the new technical reference for data process of optical surface. ? 2016, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.Accession Number: 20162302456306 -
Record 94 of
Title:Pressure sensor based on the Sagnac effect and fiber loop ringdown spectroscopy
Author(s):Yang, Songlin(1,2); Ruan, Chi(1); Wang, Yuntao(1)Source: Optical Engineering Volume: 55 Issue: 10 DOI: 10.1117/1.OE.55.10.107101 Published: October 1, 2016Abstract:A fiber-optic sensing scheme of measuring pressure is described here. The high reflective mirror in a laser cavity is replaced by a Sagnac loop in this scheme. The method combining the Sagnac effect with fiber loop ringdown technology fully embodies the advantages of both. The working principle is discussed in detail, and the whole sensing performance is demonstrated by applying sensing force to the sensor area. The sensing force can be obtained by measuring the ringdown time. The pressure measurement range of this device is 40 to 350 N. The detection sensitivity 0.4 ns/N can be realized in this system. The experimental curve reveals a close relationship between the sensing strain and the ringdown time. ? 2016 Society of Photo-Optical Instrumentation Engineers (SPIE).Accession Number: 20164202915403 -
Record 95 of
Title:Deployable structure design and analysis for space membrane diffractive telescope
Author(s):Zheng, Yaohui(1,2); Ruan, Ping(1); Cao, Shang(1,2)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 45 Issue: 1 DOI: 10.3788/IRLA201645.0118004 Published: January 25, 2016Abstract:In order to satisfy the demand for the big aperture diffraction space telescope, a primary lenses deployable structure for space membrane diffractive telescope was investigated. Firstly, after analysis of the characteristics of diffraction imaging about the big aperture membrane diffraction telescope, the main requirements for deployable structure were put forward. Then according to these design requirements for the deployable structure, a 3D solid model was designed. Finally, with the help of Adams, a simulation model was established and analyzed. The results show that the structure under the driving of the rotating drive components is in line with the design form of exercise and achieved smooth and reliable movement. This deployable structure may provide a new train of thought for the design of large aperture membrane diffraction telescope. ? 2016, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.Accession Number: 20160902037313 -
Record 96 of
Title:Intra-hour cloud movement detection for solar forecasts based on ground imaging system
Author(s):Jiang, Baotan(1,2,3); Pan, Zhibin(1); Qiu, Yuehong(2); Chen, Zhi(2); Yao, Dalei(2); Bu, Fan(2)Source: Optik Volume: 127 Issue: 19 DOI: 10.1016/j.ijleo.2016.05.126 Published: October 1, 2016Abstract:The penetration of solar energy continues to rise and becomes a central piece of the global energy mix. Thus, considering ways for more efficiently operated power systems to accommodate significant amounts of such a variable resource will be increasingly important. Improvements in solar forecasting methods and techniques will clearly be relevant. In addition to season and irradiation angle, the most important factor of influencing solar energy output is the effect of cloud movement on solar irradiation shadow on solar plate. This paper briefly analyzes the advantages and disadvantages of various moving target algorithms, and compares the typical feature matching algorithm (block motion estimation algorithm) and optical flow algorithm (CLG algorithm) against the collected cloud movement image sequence. The result shows that optical flow algorithm (CLG algorithm) is applied to cloud movement image. The calculation is very fast, with an accuracy above 96%. A comparison with CLG algorithm shows that direction and speed accuracy of block motion estimation algorithm based on hexagonal search pattern is 0.79 and 0.47, respectively. ? 2016 Elsevier GmbH.Accession Number: 20162402490328