月壤含水特性原位快速预判传感器设计与验证

Design and Verification of Rapid In-situ Prediction Sensors for Lunar Soil Moisture Characteristics

基于月壤和水冰对不同谱段近红外激光存在吸收/反射差异性的特点,提出了采用多模近红外激光光强差异反演月壤含水特性的水冰原位快速预判方法。通过发射/接收光路同轴设计及多模激光光路分时复用设计,实现了多模激光光学系统轻小型化设计,研制出基于多模近红外激光的月壤水冰原位快速预判传感器工程样机,并开展了针对低含水率极区模拟月壤的含水特性原位预判试验。试验结果表明:该传感器水冰检测限可达0.39%,单次预判时间可优于1 s,光斑直径@检测距离为5 cm@500 mm,传感器具备对地面模拟月壤含水特性进行原位快速预判的能力。

Based on the absorption and reflection characteristics of lunar soil and water ice to different spectral bands of near-infrared laser,a rapid in-situ prediction method of lunar soil water ice using multimode near-infrared laser light intensity difference inversion is proposed.Through transmitting/receiving optical path coaxial design and multimode laser optical path time division multiplexing design,the lightweight and miniaturized design of the multimode laser optical system is realized,and an engineering prototype of lunar soil water ice in-situ rapid prediction sensor is developed.The in-situ prediction tests of water content characteristics are carried out for the simulated lunar soil in the Moon’s polar regions(low water content),and the results show that the detection limit is better than 0.39%,the single detection time is about 1 s,the spot diameter@detection distance is 5 cm@500 mm,and the sensor has the ability to rapidly predict the water content characteristics of the ground simulated lunar soil in-situ.