1 中国科学院空间主动光电技术重点实验室，上海 200083
2 中国科学院上海技术物理研究所，上海 200083
由于加工生产、发射振动以及空间温度交变等因素，星上载荷的安装接口会出现一定的形位误差，进而激光测高仪的光轴指向发生偏差。为了减小机械接口对载荷的影响，基于运动学安装的原理，设计了测高仪的支撑结构。在接口刚度匹配性分析的基础上，对支撑结构进行了设计优化。采用蒙特卡罗统计方法对星上接口的误差分布进行了分析，确定了载荷安装点的误差输入。通过分析与试验验证发现：所设计的支撑结构的一阶基频达到88 Hz，激光收发光轴安装时引起的光轴总偏离量约为8.5 μrad，力学振动引起的光轴总偏离量为30 μrad。热光试验表明，高低温边界处的光轴稳定度为8.5 μrad。所设计的支撑结构能够满足测高仪的使用指标要求。设计思路与试验结果对星载激光类载荷接口设计具有一定的参考性。
测量 空间仪器 星载接口 运动学支撑 支撑刚度 统计分析 中国激光
2023, 50(14): 1404004
利用多波束激光进行航天地形测绘是当前的研究热点之一,激光指向确定是其中的核心环节,一般采用激光参考相机(LRC)记录,LRC的视轴监视功能和性能是确保激光指向确定精度的关键。首先,提出一种基于高稳定中央棱镜的LRC视轴监视测量方法,并给出了计算算法。其次,搭建实验验证系统,利用Hexpod转台和光电自准直仪对算法正确性进行了校验,结果表明,所提算法得到的测量结果与光电自准直仪结果一致,误差小于0.2″。进一步地,测量得到LRC视轴绕X轴和Y轴的热漂移分别达到0.3″和1.4″。最后,评估了不同环境下的视轴监视精度,结果表明,在真空环境下,视轴监视精度达到0.02″(1倍标准偏差),满足LRC视轴在轨监视的实际应用要求;相比于真空条件,大气隔振条件下的误差扩大了2~4倍,大气非隔振条件下的误差扩大了10~15倍。
测量 空间测量 激光参考相机 视轴监视 激光光斑质心 光学学报
2021, 41(15): 1512003
Author Affiliations
Abstract
1 Department of Precision Instrument, Tsinghua University, Beijing 100084, China
2 State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China
3 Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA
The star tracker, an optical attitude sensor with high accuracy, is widely used in satellites for attitude determination and control. However, it is susceptible to the sunlight and the earthlight for application on satellites in the sun-synchronous orbit. Therefore, the suppression of the sunlight and the earthlight is important for the star tracker. In this Letter, a vector model is proposed to describe the relationship among the Sun, the Earth, and the satellite body, and, based on the equations of the boundary curves, the vector areas free from the sunlight and the earthlight in the body coordinate system of the satellite are derived. Meanwhile, the installation orientation of the star tracker and the corresponding exclusion angle of the earthlight are optimized. The simulation results indicate that the optimization method for the installation orientation and the exclusion angle of the star tracker is accurate and effective.
120.4640 Optical instruments 120.6085 Space instrumentation 280.4788 Optical sensing and sensors Chinese Optics Letters
2017, 15(8): 081201
Author Affiliations
Abstract
We demonstrate a tunable wavelength-locked seed laser source with high-frequency stability to realize the precise measurements of global atmospheric wind field. An Nd:YAG laser at 1 064 nm is used as the master laser (ML). Its frequency is locked to a confocal Fabry-Perot interferometer by using the Pound-Drever-Hall method, which ensures the peak-to-peak value of its frequency drifts less than 180 kHz over 2 h. Another Nd:YAG laser at 1 064 nm, as the slave laser, is offset-locked to the above ML using optical phase locked loop, retaining virtually the same absolute frequency stability as the ML. The tunable ranges of the frequency differences between two lasers are up to 3 GHz, and the tuning step length was an arbitrary integral multiple of 200 kHz. The researched seed laser source is compact and robust, which can well satisfy the requirement of the Doppler wind lidar.
140.3425 Laser stabilization 140.3600 Lasers, tunable 120.6085 Space instrumentation Chinese Optics Letters
2012, 10(9): 091405
Author Affiliations
Abstract
1 National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China
2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
A robust external cavity diode laser (ECDL) insensitive to mechanical vibration is built with an interference filter for selecting wavelength and a cat-eye reflector for light feedback. The free-running laser has a linewidth of 72 kHz. The laser frequency stability reaches 3×10-12 at 1-s integration time in terms of relative Allan variance based on the saturation absorption spectrum.
外腔半导体激光器 频率稳定度 干涉滤光片 “猫眼”反射器 140.2020 Diode lasers 140.3425 Laser stabilization 120.6085 Space instrumentation 350.2460 Filters, interference Chinese Optics Letters
2010, 8(3): 300
Author Affiliations
Abstract
Department of Optoelectronic Engineering, Beijing Insititute of Technology, Beijing 100081, China
We report the laboratory experiment on a segmented mirror testbed that shows the use of a dispersed Rayleigh interferometer to phase segmented mirrors. Segment alignment of tip-tilt is fulfilled by overlapping diffraction pattern centroids of the three individual segments on the focal plane. A spherical interferometer is introduced to evaluate the performance of piston, tip-tilt sensing, and control closed-loop, and finally a total residual root-mean-square (RMS) surface error of about 45 nm is achieved, in which a typical error of about 20 nm is contributed by piston. These results demonstrate that the dispersed Rayleigh interferometer can successfully sense the piston of segmented mirrors and be used in phasing segmented telescopes under extensive studies.
拼接镜面 共相位 色散瑞利干涉仪 共相位检测与控制平台 120.3180 Interferometry 120.1088 Adaptive interferometry 120.2830 Height measurements 120.6085 Space instrumentation Chinese Optics Letters
2009, 7(11): 1007
