Chang'E 3 Special Issue

Development and calibration of the Moon-based EUV Camera for Chang’e-3

Bo Chen, Ke-Fei Song, Zhao-Hui Li, Qing-Wen Wu, Qi-Liang Ni, Xiao-Dong Wang, Jin-Jiang Xie, Shi-Jie Liu, Ling-Ping He, Fei He, Xiao-Guang Wang, Bin Chen, Hong-Ji Zhang, Xiao-Dong Wang, Hai-Feng Wang, Xin Zheng, Shu-Lin E, Yong-Cheng Wang, Tao Yu, Liang Sun, Jin-Ling Wang, Zhi Wang, Liang Yang, Qing-Long Hu, Ke Qiao, Zhong-Su Wang, Xian-Wei Yang, Hai-Ming Bao, Wen-Guang Liu, Zhe Li, Ya Chen, Yang Gao, Hui Sun, Wen-Chang Chen


Abstract The process of development and calibration for the first Moon-based extreme ultraviolet (EUV) camera to observe Earth’s plasmasphere is introduced and the design, test and calibration results are presented. The EUV camera is composed of a multilayer film mirror, a thin film filter, a photon-counting imaging detector, a mechanism that can adjust the direction in two dimensions, a protective cover, an electronic unit and a thermal control unit. The center wavelength of the EUV camera is 30.2 nm with a bandwidth of 4.6 nm. The field of view is 14.7° with an angular resolution of 0.08°, and the sensitivity of the camera is 0.11 count s−1 Rayleigh−1. The geometric calibration, the absolute photometric calibration and the relative photometric calibration are carried out under different temperatures before launch to obtain a matrix that can correct geometric distortion and a matrix for relative photometric correction, which are used for in-orbit correction of the images to ensure their accuracy.


Keywords Chang’e-3 — EUV camera: development: calibration — Earth’s plas- masphere — lunar exploration

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