中国科学院机构知识库网格系统: 检索

Design of secondary lens focusing mechanism for multispectral camera 会议论文 OAI收割
Xi'an, China, 2021-05-28
作者: Rui, Wang; Xiuqin, Su; Yongming, Qiao; Tao, Lv; Xuan, Wang

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收藏 | 浏览/下载：41/0 | 提交时间：2021/07/20

Secondary lens focusing mechanism Rhomboid amplifier large PZT actuator Flexible hinge Focusing speed Tilt error

Wideband Vibrations Rejection of Tip-Tilt Mirror Using Error-Based Disturbance Observer 期刊论文 OAI收割
IEEE Access, 2020, 卷号: 8, 页码: 5131-5138
作者: Niu, Shuaixu; Yang, Tao; Tang, Tao; Xu, Tianrong; Ruan, Yong

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收藏 | 浏览/下载：39/0 | 提交时间：2021/05/11

Error-based disturbance observer wideband vibration rejection optical telescopes Youla parameterization tip-tilt mirror

Misalignment Calculation on Off-Axis Telescope System via Fully Connected Neural Network 期刊论文 OAI收割
IEEE Photonics Journal, 2020, 卷号: 12, 期号: 4, 页码: 0600112-1-12
作者: Liu, Zhu; Peng, Oi; Xu, Yangjie; Ren, Ge; Ma, Haotong

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收藏 | 浏览/下载：25/0 | 提交时间：2021/05/11

Off-axis Telescope Misalignment Decentering And Tilt Error Zernike Coefficients Fully Connected Neural Network

Dynamic surface parameter analysis for frequency response of tip/tilt mirror 期刊论文 OAI收割
OPTIK, 2020, 卷号: 203
作者:

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收藏 | 浏览/下载：24/0 | 提交时间：2020/07/20

Tip/tilt mirror Dynamic surface parameter Discrete error Opto-mechanical integrated simulation

A review on control methodologies of disturbance rejections in optical telescope 期刊论文 OAI收割
OPTO-ELECTRONIC ADVANCES, 2019, 卷号: 2, 期号: 10
作者: Tang, Tao; Niu, Shuaixu; Ma, Jiaguang; Qi, Bo; Ren, Ge

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收藏 | 浏览/下载：43/0 | 提交时间：2021/05/06

structural vibrations astronomical telescope Q-filter error-based DOBC Tip-Tilt mirror

Influence and simulated correction of tip/tilt phase error on fiber laser coherent beam combination 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2011, 卷号: 60, 期号: 11
作者: Geng Chao; Li Xin-Yang; Zhang Xiao-Jun; Rao Chang-Hui

收藏 | 浏览/下载：29/0 | 提交时间：2015/09/21

fiber laser coherent beam combination tip/tilt phase error dynamic analysis

Design and test of pointing mirror assembly for spaceborne remote sensing camera (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electronics, Communications and Control, ICECC 2011, September 9, 2011 - September 11, 2011, Ningbo, China
作者: Chen W.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

In order to ensure the surface figure of the pointing mirror (460mm long 290mm wide) in spaceborne remote sensing camera Silicon Carbide was selected as the mirror material. The form of composite triangular and rectangular and the combination of open and closed back was explored in the lightweight design. A new kinematic mount and flexible structure in axis is used to hold the mirror around the lateral surface. The structure can minimize distortions induced by coefficient of thermal expansion mismatch among the materials. This eliminates the bending of the integral mount under the weight of the mirror. Optical performance of the mirror was analyzed under gravity load and temperature load using finite element method. Predicted surface figure error based on the removal of bias tilt and power was calculated using an in-house Matlab script for mirrors. The pointing mirror assembly was tested using open loop servo control. And the surface figure was checked using interferometer. Surface figure accuracy is better than 1/30 ( 632.8nm rms). The results show that the kinematic mount induces minimal figure error on the optical surface. 2011 IEEE.

Performance analysis of bit error rate for free space optical communication with tip-tilt compensation based on gamma-gamma distribution 期刊论文 OAI收割
Optica Applicata, 2009, 卷号: 39, 期号: 3, 页码: 533-545
作者: Wu HL(吴晗玲); Yan HX(严海星); Li XY; Wu HL

收藏 | 浏览/下载：986/181 | 提交时间：2009/08/03

Free Space Optical Communication Atmospheric Turbulence Adaptive Optics Bit Error Rate Tip-Tilt Compensation Atmospheric-Turbulence Channels Ber Performance Links Modulation

Study on technology of orientation and north-finding based on fiber optic gyroscope (EI CONFERENCE) 会议论文 OAI收割
2007 IEEE International Conference on Mechatronics and Automation, ICMA 2007, August 5, 2007 - August 8, 2007, Harbin, China
Zhang Z.; Sun J.; Wu K.

收藏 | 浏览/下载：15/0 | 提交时间：2013/03/25

North-finding system provides true north azimuth information to all kinds of ground-based equipment. A dynamic automatic north-finder based on the modulation output of fiber optic gyroscope (FOG) is presented in this paper. In this scheme the sine output signal of the FOG was sampled and disposed and then the real north of surveyed point on the surface of earth was calculated. The deviation caused by the platform base tilt was compensated by an accelerator Allan standard deviation is used to analyze the random drift of FOG and establish the random error mode of FOG. The FOG north-finding and laser collimation theodolite are assembled to achieve orientation and aiming integral which lays foundation for switching to project application. 2007 IEEE.

Grating interferometry method for torsion measurement (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Liu W.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

Method of grating interferometry was presented for torsion angle measurement moire fringe generated by two gratings is used in a new field it breaks through moire fringe's routine application. Measurement principle is described torsion angle can be gotten by the tilt angle or the width of moire fringe. Different from moire fringe's characteristic information extracting methods in traditional measurement fields fringe-tilt method and fringe-width method were put forward to extract moire fringe's characteristic information. Fringe-tilt method is on the basis of moire fringe's tilt to acquire torsion angle uniform formula was built aiming at all positions of two gratings in the coordinates fringe-width method is on the basis of moire fringe's width to acquire torsion angle three key problems are given about fringe-width method. Thick middle and thin moire fringe were collected in experiments and processed by two methods fringe-width method's result shows that magnitude of boat torsion error is satisfied with that of theoretical precision analysis and the change rule of torsion error is also same to that of theoretical analysis the thicker fringe is the higher precision is when fringe width arrives to be 1695m the precision is 1.7" the thinner fringe is the lower precision is when fringe width arrives to be 734.7m the precision is 6.7". In addition to these the results of repeatability experiments sensibility experiments are given. In a word the measurement principle is right and the precision of fringe processing is also reliable.