2010
2010
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Record 97 of
Title:Separating misalignment from misfigure in stigmatic null tests of conic mirrors
Author(s):Chen, Qinfang(1,2); Ma, Zhen(1,2); Li, Yingcai(1); Li, Xuyang(1,2)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 7849 Issue: DOI: 10.1117/12.869784 Published: 2010Abstract:Null testing of off-axis conic surface at the pair of conjugate foci can add sensitivity resulting from double pass off the test piece. However, the alignment procedure of the test is difficult. The main reason is that the return wavefront from off-axis aspheric surface is not rotationally symmetric so that the observer cannot tell if the wavefront asymmetries are due to surface or misalignment errors. In this paper, we analyze the effect of misalignments on test results with the optical path method, and derive an equation for misalignment-induced aberrations. Next we present an optimum method for the removal of alignment errors. As an example the method is applied to the alignment of an off-axis mirror. After several alignments, a misaligned test system giving 0.093λ rms wavefront error can be adjusted to 0.024λ, at 0.6328 microns. ? 2010 Copyright SPIE - The International Society for Optical Engineering.Accession Number: 20110113551015 -
Record 98 of
Title:A single-channel fiber optic rotary joint on the basis of TEC fiber collimators
Author(s):Mi, Lei(1,2,3); Yao, Sheng-Li(1,3); Sun, Chuan-Dong(1); Sun, Bo(3); Zhang, Hong-Ju(1,3)Source: IET Conference Publications Volume: 2010 Issue: 574 CP DOI: 10.1049/cp.2010.1245 Published: 2010Abstract:This article describes a single-channel single-mode fiber optic rotary joint for optical data transmission based on well designed TEC fiber collimator. The insertion loss of a fiber optic rotary joint depends on the mechanical misalignments of the fiber collimator. Analysis of the characteristics of TEC fiber and TEC fiber collimator coupling characteristics. Using TEC fiber collimator can reduce the loss of angle tilt misalignment. We fabricated single-channel fiber optic rotary joint which insert loss below 1.27dB. We tested fiber-optic rotary joint by temperature shock from range of - 40 °C up to + 85 °C, our products the average variation of insertion loss is 0.22dB.Accession Number: 20113014173340 -
Record 99 of
Title:Optical system design of space camera with long focal length and correction of image distortion
Author(s):Li, Xuyang(1,2); Li, Yingcai(1); Ma, Zhen(1,2); Yi, Hongwei(1); He, Tianbing(1)Source: Guangxue Xuebao/Acta Optica Sinica Volume: 30 Issue: 9 DOI: 10.3788/AOS20103009.2657 Published: September 2010Abstract:With the development of space optical technology, time delay and integration charge coupled device (TDI-CCD) space camera has been widely applied. TDI-CCD image sensor not only improves signal-noise-ratio(SNR) of the optical system but also makes the opto-mechanical structure of the camera more compact, but the optical system distortion will affecte image quality, so the optical system design must satisfy the new demand. The optical system distortion which affects TDI-CCD integral is analyzed. The method of image distortion elimination of space camera optical system is researched. An optical system is designed with distortion correction lens which is characterized by the spectral band of 450~900 nm, focal length of 6000 mm, and F number of 10. The result indicates that the view field angle reaches 1.6°, optical system distortion is less than 0.01%. modulation transfer function reaches 0.50 at 50 lp/mm Nyquist frequency with 0.06 central obscure, and the quality of image reaches the diffraction limit. The designed optical system can meet the demand for the use of high resolution space cameras, and is suitable for multi-spectrum, stereo imaging, and stereo mapping camera system which has little distortion.Accession Number: 20104313323592 -
Record 100 of
Title:Multi-carbazole derivatives for two-photon absorption data storage: Synthesis, optical properties and theoretical calculation
Author(s):Li, Lin(1); Yang, Jia Xiang(1,2); Wang, Cai Xia(1); Hu, Zhang Jun(1); Tian, Yu Peng(1,2); Li, Jing(3); Wang, Chuan Kui(3); Li, Ming(4); Cheng, Guang Hua(4); Tang, Huo Hong(5); Huang, Wen Hao(2); Tao, Xu Tang(2); Jiang, Min Hua(2)Source: Science China Chemistry Volume: 53 Issue: 4 DOI: 10.1007/s11426-010-0125-9 Published: April 2010Abstract:Two novel quadrupolar organic compounds, 3-(4-((E)-2-(9-butyl-9H-carbazol- 6-yl) vinyl)styryl)-9-propyl-9H-carbazole (BCSPC) and 3-(3-(3-((1E)-2-(4-((E)-2- (3-(3,5-bis(9-butyl-9H-carbazol-6-yl)phenyl)-9-butyl-9H-carbazol-6-yl)vinyl) phenyl) vinyl)-9-butyl-9H-carbazol-6-yl)-5-(9-butyl-9H-carbazol-6-yl)phenyl)-9- butyl-9H-carbazole (BCPBC), with different conjugated arms, have been designed and synthesized. Their one-and two-photon absorption (TPA) and excited fluorescence properties have been experimentally investigated. The two-photon absorption cross-sections of two compounds were estimated by two-photon excited fluorescence technique using 200 fs, 76 MHz, Ti:sapphire laser, which are 22 and 154 GM for BCSPC and BCPBC, respectively. The optimal excitation wavelengths are 780 nm for both BCSPC and BCPBC. A data recording experiment proved the potential application of the materials. ? Science China Press and Springer-Verlag Berlin Heidelberg 2010.Accession Number: 20102413005451 -
Record 101 of
Title:Digital synchronous system for ultra high-speed physical diagnostic equipments
Author(s):Xue, Ying-Dong(1,2); Bai, Yong-Lin(1); Li, Yan(1,2)Source: 2010 Symposium on Photonics and Optoelectronic, SOPO 2010 - Proceedings Volume: Issue: DOI: 10.1109/SOPO.2010.5503997 Published: 2010Abstract:A design of the digital synchronous system which is based on FPGA is presented. To reduce the delay of the system logic and enhance the working frequency, the timing constraints have been analyzed. We investigate the influences of the delay of data output (Tco), the delay of combinational logic circuits (Tdelay), the setup time (T setup) and the clock cycle (T) on the working frequency, and adopt the method of combinational logic splitting to reduce the LUT cascade connection. As a result, not only is stably running the system at 200 MHz clock realized, but also completely meets the experiment requirements. This system provides a reliable guarantee for controlling on ultra high-speed physical diagnostic system. ?2010 IEEE.Accession Number: 20103013103997 -
Record 102 of
Title:Focal plane design of Chang'e-1 satellite CCD stereo-camera and laboratory radiation calibration
Author(s):Song, Zongxi(1,2); Zhao, Baochang(1); Gao, Wei(1); Yang, Jianfeng(1); Ruan, Ping(1)Source: Guangxue Xuebao/Acta Optica Sinica Volume: 30 Issue: 12 DOI: 10.3788/AOS20103012.3508 Published: December 2010Abstract:The special focal plane design and radiation calibration of Chang'e-1 satellite CCD stereo-camera are discussed. A wide-angle, telecentric and orthoscopic optical lens coupled with an area array CCD is used as a sensor in Chang'e-1 satellite CCD stereo camera to complete the three-line array self-propelling-sweeping imaging. But with the existence of shutter smear, the exposure time has some great differences between the foresight, vertical sight and back sight. It brings difficulties to the radiometric calibration. This paper presents a solution of setting up a three-slit mask in front of the CCD focal plane, which makes the three line exposure time almost the same and after the residuals in the laboratory calibration are further adjusted, good result is obtained. This paper also introduces other performances in the radiation calibration including the estimation of the shortest exposure time, the registration of the saturation radiance, the dark current noise test, the linearity of CCD pixel response and the uncertainties of relative calibration and absolute calibration.Accession Number: 20111213768127 -
Record 103 of
Title:Analysis and calculation of space-based infrared detecting system
Author(s):Niu, Jinxing(1,2); Zhou, Renkui(1); Liu, Zhaohui(1); Cai, Zhan'en(1,2)Source: Guangxue Xuebao/Acta Optica Sinica Volume: 30 Issue: 3 DOI: 10.3788/AOS20103003.0768 Published: March 2010Abstract:The sources of stray sight of space-based infrared detecting system are studied. They are analyzed and calcuated by use of blackboby radiation. The irradiance of the focal plane which arises from earth and atmosphere is analyzed by model established in TracePro. The projected solid angle subtended by the surface of earth and atmosphere to the camera can be known by the method of ray-tracing. The method makes the complex calculation become easy. Then the noises of detecting system are analyzed. The noise-equivalent-irradiance (NEI) of a certain Sofradir infrared-focal-plane-array is calculated and compared with irradiance induced by other stray lights. The result proved that the irradiance of the focal plane which arises from stray light is far bigger than the NEI of the infrared-focal-plane-array. Methods should be adopted to suppress stray light. The demand of rejection of the stray light from earth and atmosphere and the demand of the temperature of optical system are given. This result can be a reference for system design.Accession Number: 20101912918466 -
Record 104 of
Title:Self-stabilization target tracking technology based on mobile platform
Author(s):Wang, Chen(1,2); Ma, Cai-Wen(1); Liang, Yan-Bing(1); Chen, Er-Rui(1,2)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 39 Issue: 4 DOI: Published: August 2010Abstract:The self-stabilization tracking technique is the key technique for theodolite tracking based on the mobile platform. To improve the tracking and positioning accuracy, the self-stabilization tracking technique based on mobile platform was studied. In the technique, the position of object was transformed from the platform coordinate system to the earth coordinate system by using coordinate transform. A method of forecast tracking technique based on mobile platform was presented. The former complex angle was transformed from the platform coordinate to the earth coordinate and the next complex angle was forecasted according to the trajectory of the complex angle. In the end, the forecast result was transformed back to the platform coordinate. By this means, the stable tracking technique based on mobile platform was realized. In comparison with the direct forecast result in platform coordinate, the forecast technique presented in the paper is more accurate and appropriate to realize stable tracking on mobile platform.Accession Number: 20104313323773 -
Record 105 of
Title:Design of stray light test facility based on optical system of star-simulator
Author(s):Feng, Guangjun(1,2); Ma, Zhen(1); Li, Yingcai(1)Source: Zhongguo Jiguang/Chinese Journal of Lasers Volume: 37 Issue: SUPPL. 1 DOI: 10.3788/CJL20103701.0105 Published: November 2010Abstract:The detection ability of high resolution photoelectric detection system, to a great extent, is limited by the stray light. Since various factors influence stray light of optical system, its stray light must be tested in order to control the final indicators, such as point source transmittance (PST). On the base of star-simulator with huge dynamic range, the stray light test facility is designed, and the problem that dynamic range of single detector cannot cover 108 is solved. Under a reasonable signal-to-noise ratio, the test range of stray light PST with electron-multiplying CCD (EMCCD) is analyzed. Through analysis, the range of the stray light PST can reach 10-2-10-8, and meet the requirement for testing high resolution photoelectric detection system's PST.Accession Number: 20105013489841 -
Record 106 of
Title:Aberration analysis and design of four-mirror reflective optical system
Author(s):Liang, Shitong(1,2); Yang, Jianfeng(1); Xue, Bin(1); Ruan, Ping(1); Wang, Hongwei(1,2)Source: Guangxue Xuebao/Acta Optica Sinica Volume: 30 Issue: 11 DOI: 10.3788/AOS20103011.3300 Published: November 2010Abstract:Reflective optical systems have small size, light weight and excellent imaging performance, which makes it very popular in space remote sensing systems. The third order aberration expression and basic design process of four-mirror system are given by aberration analysis based on PW method. Two space remote sensing systems using coaxial and abaxial four-mirror system is designed under the guidance of the aberration theory. The two systems have excellent imaging performance. The systems have compact structure and the physical length to the EFL ratio is about 1/6.4. Both of the size and weight meet the technical requirements, the correctness and practicality of the theoretical analysis are proved.Accession Number: 20105013479798 -
Record 107 of
Title:The data processing of the temporarily and spatially mixed modulated polarization interference imaging spectrometer
Author(s):Jian, Xiaohua(1,2); Zhang, Chunmin(1,2); Zhang, Lin(1,2); Zhao, Baochang(3)Source: Optics Express Volume: 18 Issue: 6 DOI: 10.1364/OE.18.005674 Published: March 15, 2010Abstract:Based on the basic imaging theory of the temporally and spatially mixed modulated polarization interference imaging spectrometer (TSMPHS), a method of interferogram obtaining and processing under polychromatic light is presented. Especially, instead of traditional Fourier transform spectroscopy, according to the unique imaging theory and OPD variation of TSMPIIS, the spectrum is reconstructed respectively by wavelength. In addition, the originally experimental interferogram obtained by TSMPIIS is processed in this new way, the satisfying result of interference data and reconstructed spectrum prove that the method is very precise and feasible, which will great improve the performance of TSMPIIS. ? 2010 Optical Society of America.Accession Number: 20101212793985 -
Record 108 of
Title:Optical system design of space camera with large F number and long focal length
Author(s):Li, Xuyang(1,2); Li, Yingcai(1); Ma, Zhen(1,2); Yi, Hongwei(1); Feng, Guangjun(1,2)Source: Guangxue Xuebao/Acta Optica Sinica Volume: 30 Issue: 7 DOI: 10.3788/AOS20103007.2093 Published: July 2010Abstract:With the development of space technology, the optical system design must be satisfied with the lastest demand due to the ground sample distance (GSD) steadily improving. The issues of the optical system design is discussed, the space optical system design principle with large F number, long focal length is analyzed and a reflective optical system which is characterized by the spectrum band 500~800 nm, focal length of 7200 mm and F number of 14.4 is designed. The result indicates that the field angle reaches 1.6°, the ground width reaches 12.5 km and the graund sample distance (GSD) reaches 0.62 m at 450 km orbit, the quality of image approaches the diffraction limited, modulation transfer function (MTF) reaches 0.38 at the Nyquist frequency of 50 lp/mm with 6% central obscure, and optical system distortion is less than 0.5%. So this kind of optical system can meet the demand for the use of high resolution space cameras. At the same time, the large F number, long focal length design principle are approved.Accession Number: 20103113111312