Liang Xiao-Hua, Wu Ming-Ye, Wang Huan-Yu, Peng Wen-Xi, Zhang Cheng-Mo, Cui Xing-Zhu, Wang Jin-Zhou, Zhang Jia-Yu, Yang Jia-Wei, Fan Rui-Rui, Gao Min, Liu Ya-Qing, Zhang Fei, Dong Yi-Fan, Guo Dong-Ya
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2013 May;33(5):1360-3.
Alpha particle X-ray spectrometer (APXS) is one of the payloads of Chang'E-3 lunar rover, the scientific objective of which is in-situ observation and off-line analysis of lunar regolith and rock. Distance measurement is one of the important functions for APXS to perform effective detection on the moon. The present paper will first give a brief introduction to APXS, and then analyze the specific requirements and constraints to realize distance measurement, at last present a new near infrared distance sensing algorithm by using the inflection point of response curve. The theoretical analysis and the experiment results verify the feasibility of this algorithm. Although the theoretical analysis shows that this method is not sensitive to the operating temperature and reflectance of the lunar surface, the solar infrared radiant intensity may make photosensor saturation. The solutions are reducing the gain of device and avoiding direct exposure to sun light.
α粒子X射线光谱仪（APXS）是嫦娥三号月球车搭载的有效载荷之一，其科学目标是对月壤和岩石进行原位观测与离线分析。距离测量是APXS在月球上进行有效探测的重要功能之一。本文首先简要介绍APXS，然后分析实现距离测量的具体要求和约束条件，最后提出一种利用响应曲线拐点的新型近红外距离传感算法。理论分析和实验结果验证了该算法的可行性。虽然理论分析表明该方法对月球表面的工作温度和反射率不敏感，但太阳红外辐射强度可能会使光电传感器饱和。解决方法是降低设备增益并避免直接暴露在阳光下。
