Modeling the modulation transfer function measurement system of large aperture space cameras

Shangkuo Liu; Zhengfeng Wang; Kun Cao; Tao Wang; Yan Zhou; Jianke Zhao; Baoli Yao

doi:10.1117/12.2616315

15 February 2022 Modeling the modulation transfer function measurement system of large aperture space cameras

Shangkuo Liu, Zhengfeng Wang, Kun Cao, Tao Wang, Yan Zhou, Jianke Zhao, Baoli Yao

Proceedings Volume 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021); 1216639 (2022) https://doi.org/10.1117/12.2616315
Event: Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 2021, Hong Kong, Hong Kong

Abstract

Large aperture space cameras are widely used in high-resolution remote sensing, ultra-weak space targets detection, high-precision astronomical observation, etc. Modulation transfer function (MTF) can directly reflect the information transmission ability of a space camera. Usually, the image quality of a camera is evaluated by measuring its MTF. The MTF of a space camera needs to be measured during alignment of the optical system and electronic system, preset of the vacuum focus position, mechanical experiment, thermal experiment, etc. This paper suggests a method to model the imaging chain of large aperture space camera MTF measurement systems. The model comprehensively considers the factors of the aberration of the collimator, air turbulence, temperature variation, gravity, and environmental vibration. We calibrate the aberration of the collimator, air turbulence, temperature variation, and gravity induced error by measuring the corresponding wavefront error with a 4D laser interferometer. A star point target is placed in the focus position of the collimator to calibrate the environmental vibration through extracting the centroids of the point target images captured by the space camera. The impacts of the previous factors on the MTF measurement results of the space camera are obtained with the proposed model and the corresponding calibration data. The proposed method can evaluate the impacts of different factors on the MTF measurement results and can guide the measurement of large aperture space camera MTF.

Citation Download Citation

Shangkuo Liu, Zhengfeng Wang, Kun Cao, Tao Wang, Yan Zhou, Jianke Zhao, and Baoli Yao "Modeling the modulation transfer function measurement system of large aperture space cameras", Proc. SPIE 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 1216639 (15 February 2022); https://doi.org/10.1117/12.2616315

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KEYWORDS

Modulation transfer functions

Cameras

Imaging systems

Collimators

Turbulence

Wavefronts

Systems modeling

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