Mr. Shuxiu Li Profile

Shuxiu Li

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Proceedings Article | 18 December 2019 Paper

Micro-vibration test and imaging analysis during space camera thermal-optical test

Wenji She, Kai Cui, Xiong Gao, Shuxiu Li, Huan Wang, Wei Yang

Proceedings Volume 11341, 1134114 (2019) https://doi.org/10.1117/12.2543762

KEYWORDS: Cameras, Modulation transfer functions, Mirrors, Magnesium, Analytical research, Collimators, Space operations, Thermography, Motion analysis

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The high resolution space optical camera imaging quality was sensitive to micro-vibration both in space and on the ground test. When performing the thermal-optical test within a vacuum tank, the affiliated air compressor pump, the turbo molecular pump and other pump assembles may cause micro-vibration transmitting to the payload. Firstly, the threshold and frequency bandwidth of the camera mounting flange micro-vibration were calculated based on the cameral optics and structure rigid-body theory. Secondly, three linear accelerometers were used for micro-vibration signals acquiring, and the identification plate was used for imaging. The signals and photos were acquired at the same time during the pumps turned on and turned off separately. Finally, the vibration caused by the pump assembles were analyzed after the thermal-optical experiment process, together with the images’ MTF. It’s shown that even the vacuum tank was isolated on the ground, the affiliated s’ micro-vibration ed to the inside payload, causing a previous vibration The STD of Z axis micro-vibration signal more than 3 times from 2.1mg to 9.5mg, Exceeding the analysised threshold from 9Hz to 16Hz and near the 146Hz, the peak vealue was about 3 times of the threshold at 13 Hz, while the MTF declined little, just about 2.5%.

Proceedings Article | 24 January 2019 Paper

Angular micro-vibration test of an agile satellite high resolution camera based on liner accelerometer

Kai Cui, Zhiqi Zheng, Xiong Gao, Yongqing Yang, Zhiguo Li, Shuxiu Li

Proceedings Volume 11052, 110520H (2019) https://doi.org/10.1117/12.2521437

KEYWORDS: Cameras, Satellites, Fiber optic gyroscopes, Sensors

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The angular micro-vibration of a high resolution camera mounting on an agile satellite was achieved based on pairs of liner accelerometers alignment and numerical integration method. Three pairs of sensors were mounted at different portion of the satellite for studying the structure transfer character, including the Reaction Wheel (RW)interface, the camera interface and the camera tail. The results showed that the RW original micro-vibration standard deviation (STD) output acquired at the RW interference was 1.63μrad at RW 400rpm and increased to 2.43μrad when the RW speed up to 800rpm. When transferring from RW to the camera interface, the angular vibration response STD was attenuated to 0.31μrad@400rpm and 0.27μrad@800rpm, and finally to the camera tail the angular vibration response STD became 0.31μrad@400rpm and 0.30μrad@800rpm. We can see that the satellite-camera structure has a good attenuation effect on the micro-vibration, the output angular micro-vibration STD is about 0.31μrad with an input of 1.63μrad~2.43μrad. the stiffness of the camera is pretty good, ensuring that the micro-vibration STD difference between the camera flange and the camera tail is smaller 0.03μrad. In addition, we found that the FOGs useful bandwidth wasn’t insufficient when acquiring about 340Hz main frequency vibration signal in our case, even though a higher stiffness flange was recommended which connecting the FOG and camera.

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