摘要
热辐射光谱仪作为我国首个小天体探测任务(天问二号)的科学载荷之一,主要工作为获取近地小行星2016 HO_(3)和主带彗星311P的表面热辐射光谱,研究表面的热辐射特性和矿物质分布,获取小行星表面热物理参数用于热模型反演,支持采样任务.光谱仪的谱段范围覆盖5–50μm,光谱分辨率为9.79 cm^(−1),信噪比优于326(7.5–35μm@325 K),角分辨率为3.28 mrad×3.29 mrad,重量小于10 kg.本文采用双角镜、四端口、时间调制型干涉分光技术,创新性地利用目标和参考两路输入的光学相减,有效提升探测灵敏度和动态范围.本文介绍了热辐射光谱仪的工作原理、技术特点以及地面测试与初步验证情况,可为同类载荷研制提供参考.
The Tianwen-2 mission will sample a near-Earth asteroid named 2016 HO 3,return to Earth,and then proceed to a main-belt comet 311P.The asteroid thermal emission spectrometer(ATES)is one of the scientific payloads.ATES will provide remote measurements of the surface thermal emission spectrum of these two solar small bodies,to investigate their mineralogy and thermophysical properties,as well as to aid in the selection of the sampling site.ATES is a Fourier transform spectrometer covering the spectral range of 5-50μm(200-2000 cm^(−1))with a spectral resolution of less than 10 cm−1 and a field of view of 3.28 mrad×3.29 mrad.The signal to noise ratio is more than 326(7.5-35μm@325 K).ATES observes different positions on the bodies’surfaces using its one-dimension pointing capability combining the rotation of the small body itself.The core subsystem is a time-modulated interferometer with two cube corners and four ports,which enables optical subtraction between the input energy of the scene observation port and the reference port.This design improves sensitivity and dynamic range to detect the bodies with surface temperature ranging from 100 to 422.5 K.The interferometer mechanism,featuring two-times optical path magnification,achieves a high-speed stability of 99%at slow scanning speed.Two thin LiTaO 3 detectors are used to detect interference signals at two output ports,respectively.The total mass of ATES is less than 10 kg,owing to its highly integrated and lightweight design.The power consumption of the electronics is below 50 W.The spectral and radiometric calibrations of the flight module are completed on the ground.The temperature and spectral feature detection capabilities are verified using the qualified module in vacuum chamber.The operational principle,technical characteristics,testing,calibration and verification of ATES on the ground are summarized.It can provide a reference for the development of similar instruments.
作者
李碧岑
王伟刚
张玉贵
柳稼航
刘斌
安宁
黄刚
岳鹏远
杨雯铄
迟冬南
赵鑫
翟茂林
肖大舟
柯君玉
李寅龙
翟耘萱
侯立周
黄长宁
LI BiCen;WANG WeiGang;ZHANG YuGui;LIU JiaHang;LIU Bin;AN Ning;HUANG Gang;YUE PengYuan;YANG WenShuo;CHI DongNan;ZHAO Xin;ZHAI MaoLin;XIAO DaZhou;KE JunYu;LI YinLong;ZHAI YunXuan;HOU LiZhou;HUANG ChangNing(Beijing Institute of Space Mechanics and Electricity,Beijing 100094,China;College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China)
出处
《中国科学:物理学、力学、天文学》
北大核心
2025年第7期71-84,共14页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家重大专项资助项目。
关键词
天问二号
热辐射光谱仪
傅里叶变换红外光谱仪
Tianwen-2
thermal emission spectrometer
Fourier transform infrared spectrometer
作者简介
联系人:李碧岑,E-mail:libicen_bisme@163.com。
