直接解调方法在嫦娥一号卫星X射线谱仪地面验证实验数据分析中的应用  

Application of Direct Demodulation Technique in Analysis of Ground Verification Test of X-Ray Spectrometer for Chang’E Mission

作　　者：张家宇[1] 王焕玉[1] 张承模[1] 梁晓华[1] 杨家卫[1] 汪锦州[1] 曹学蕾[1] 高旻[1] 崔兴柱[1] 彭文溪[1] 

机构地区：[1]中国科学院高能物理研究所粒子天体物理重点实验室,北京100049

出　　处：《光谱学与光谱分析》2008年第10期2450-2454,共5页Spectroscopy and Spectral Analysis

基　　金："嫦娥一号"探月专项基金资助

摘　　要："嫦娥一号"卫星是我国的第一颗月球探测卫星,运行轨道高度为200km,预计工作寿命为一年,其上配备的X射线成像谱仪具备了对月表进行X射线探测、成像和对太阳X射线进行监测的功能。该X射线谱仪由两个全同的探测器阵列组成,其中,为了实现对月表主要化学元素分布及其含量进行探测的科学目标,在每个探测器阵列还配备了2个低能探测器单元。这4路低能探测器单元的面积为25mm2,采用的都是厚度为500μm,具有优良探测性能的Si-PIN探测器,其探测能区为1～10keV,能量分辨率为～5%@5.9keV。文章主要介绍了嫦娥一号卫星X射线谱仪的地面验证实验,并且根据X射线谱仪的能量响应矩阵,利用直接解调方法和基本参数法对X射线谱仪地面验证实验中的探测数据,特别是对盲测样品中的Mg,Al,Si等元素进行了定性和定量分析。An X-ray fluorescence imaging spectrometer based on silicon PIN photodiodes was designed and constructed for the Chang＇E mission, the first lunar spacecraft, and will be in operation at a 200 km circular lunar orbit with one year lifetime. The X-ray fluorescence spectrometer consists of two silicon PIN photodiodes modules, each holds two low energy detector units to analyze the distribution of useful elements and to estimate the abundance on the moon, which is one of the objectives of the X-ray fluorescence spectrometer experiment. The low energy detector unit is 25 mm^2, 500μm thick, with the energy band of 1-10 keV, and energy resolution of： ～5% at 5.9 keV. The ground verification tests of the X-ray spectrometer for Chang＇E mission were introduced in the present paper. Taking the energy response matrix of the spectrometer as the foundation and using the direct demodulation technique and fundamental parameter method, the authors performed some quantitative and qualitative analysis of these scientific data which came from the ground verification tests, especially for Mg, Al and Si elements.

关 键 词：X射线谱仪 验证实验 定量分析 

分 类 号：O657.3[理学—分析化学]