嫦娥三号粒子激发X射线谱仪能谱温度影响的修正方法

Temperature Effect Correction for Chang'E-3 Alpha Particle X-Ray Spectrometer

粒子激发X射线谱仪(APXS)是中国探月工程二期嫦娥三号月球巡视器的有效载荷之一。简要介绍APXS的工作原理、组成部分,以及它在月面的工作环境,通过模拟及实验研究了月面热环境对APXS的影响,结果显示,APXS将工作在显著的变温过程中。相对恒温过程,APXS在变温过程中的能量分辨率明显变差。为了消除该温度效应的影响,提出了一种基于皮尔逊卡方检验(Pearson’s chi-squared test)的修正方法,能够有效提高变温过程中的能量分辨率。通过温度循环试验中变温阶段的数据对该方法进行了测试,结果表明,该方法具有很好的修正效果和较高的可靠性。

Alpha particle X-ray spectrometer （APXS） is one of the payloads of Chang＇E-3 lunar rover of China＇s Lunar Explora- tion Project. The present paper introduces briefly the components of APXS, how it works and its working environment on the lunar surface. The environmental temperature effect has been studied with simulations and experiments, and the results show that the temperature of the APXS sensor will be varying during the measuring on the lunar surface. And another experiment re- veals that the energy resolution becomes worse if the sensor＇s temperature is varying. In this paper, a correction method based on Pearson＇s chi-squared test is presented. The method can improve the energy resolution when the sensor＇s temperature is var- ying. We have tested the method with the spectra acquired by APXS in the temperature varying period of Temperature Cycling Test, and the results show that the method is efficient and reliable.