Development and calibration of the Moon-based EUV camera for Chang＇e-3

• Published in: 天文和天体物理学研究：英文版 2014 (12), p.1654-1663
• Main Author: 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-DongWang 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
• Format: Article
• Language: English
• Subjects: EUV; 光子计数成像; 多层膜反射镜; 月亮; 极紫外; 校准结果; 照相机; 等离子体层
• ISSN: 1674-4527; 2397-6209

The process of development and calibration for the first Moon-based ex- treme 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 mech- anism 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 4.6nm. 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 geomet- ric calibration, the absolute photometric calibration and the relative photometric cal- ibration 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.