基于介电特性的含冰月壤含水率反演方法研究  

Method for Predicting the Water Content of Lunar Regolith Based on Dielectric Properties

作　　者：段骁航 张伟伟[1] 薛晨阳 姜生元[1] 迟关心[1] DUAN Xiaohang;ZHANG Weiwei;XUE Chenyang;JIANG Shengyuan;CHI Guanxin(Research Center of Aerospace Mechanism and Control,Harbin Institute of Technology,Harbin 150001)

机构地区：[1]哈尔滨工业大学宇航空间机构及控制研究中心,哈尔滨150001

出　　处：《机械工程学报》2024年第2期313-322,共10页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(52005136)。

摘　　要：水冰勘探是地外天体采样与原位资源利用领域的研究热点之一,探地雷达和就位阻抗测量是基于介电特性的典型手段,通过对星壤介电系数数据反演可以获取水冰组分的质量占比。月球水冰的特殊赋存环境和赋存状态使介电类水冰勘探手段与地球水资源勘探有所差异。此研究通过搭建深低温真空条件下的介电参数测量装置,采用低含水率损耗的特殊真空低温样本制备规程,制备标准尺寸介电测量试样块。获取宽温度范围100~250 K、含水率范围0~10%的含冰模拟月壤20 Hz~1 MHz介电谱,分析含冰模拟月壤混合介质的介电特性与温度、频率间相关性,并拟合不同温度、频率条件下的含水率与介电系数实部间函数关系,探究不同温度、频率条件下含水率反演的灵敏度。根据试验结论,提出一种基于低频介电系数实部的月球极区含冰月壤的含水率就位数据反演方法,通过试验验证反演方法的可行性和精度。Water ice exploration is one of the research hotspots in the field of extraterrestrial object sampling and in-situ resource utilization.Ground penetrating radar and in-situ impedance measurement are typical methods based on dielectric characteristics.The water content can be obtained by data inversion of dielectric properties.Due to the special environmental conditions and states of lunar water ice,the existing methods are difficult to apply into lunar water ice exploration.The dielectric properties measurement system under extremely low temperature vacuum was built,and the standard size sample block for dielectric measurement was prepared by using the special procedure with minimal moisture loss.Obtain the 20 Hz-1 MHz dielectric spectrum of water-simulated lunar regolith mixture with a wide temperature range of 100-250 K and water content of 0-10%,analyze the dependence between the dielectric properties,temperature and frequency of water-simulated lunar regolith mixture,fit the function model between water content and dielectric properties under different temperature and frequency conditions,and explore the sensitivity of water content inversion under different temperature and frequency conditions.Depending on the experimental results,a water content inversion method which based on low-frequency real part dielectric properties is proposed for lunar polar regolith exploration.The feasibility and accuracy of the inversion method are verified by experiments.

关 键 词：月球水冰 含水率 介电系数 介电弛豫 灵敏度 

分 类 号：V19[航空宇航科学与技术—人机与环境工程]