嫦娥七号月壤水分子分析仪地面定标试验方法
doi: 10.11728/cjss2026.02.2025-0151 cstr: 32142.14.cjss.2025-0151
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李想 女, 1995年9月出生于安徽省芜湖市, 现为中国科学院合肥物质科学研究院安徽光机所副研究员, 主要研究方向为痕量气体及同位素高灵敏检测技术. E-mail: xlee@aiofm.ac.cn -
曹乃亮 男, 1984年8月出生于山东省泰安市, 现为中国科学院合肥物质科学研究院安徽光机所副研究员, 主要研究方向为月球及深空光谱探测技术. E-mail: nlcao@aiofm.ac.cn
作者简介:
通讯作者:
Ground Calibration Test Method for Chang’E-7 Lunar Soil Water Molecule Analyzer
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摘要: 月球极区水冰探测对揭示月球演化、支撑未来月球科研站建设至关重要. 然而, 通过现有遥感手段与返回样品难以精确获取其赋存形态、含量及来源. 嫦娥七号( Chang’E-7 )飞跃器将搭载月壤水分子分析仪(LUWA), 首次对月球南极永久阴影区水冰开展就位探测. 本文介绍了LUWA的组成、原理及其与水冰钻取装置协同实现“钻探采样－接样密封－加热分析”的探测过程. 为确保载荷在轨实现高灵敏度、宽动态范围的水冰含量探测和高精度水同位素分析, 针对三个测水功能模块搭建了地面定标试验装置, 提出了定标方法; 围绕整机性能指标, 搭建了月壤水冰就位探测模拟试验平台, 模拟极区水冰的钻采、接样、密封、加热与分析全过程, 为在轨月壤水冰含量等数据反演提供重要支撑.
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关键词:
- 月壤水分子分析仪(LUWA) /
- 永久阴影区 /
- 极区水冰探测 /
- 地面定标方法
Abstract: The lunar pole’s water ice is essential for understanding the Moon’s evolution and building future lunar research station. Nevertheless, existing orbital remote-sensing missions and returned samples remain insufficient to resolve the key unknowns of polar water, including its occurrence modes (e.g., adsorbed water/hydroxyl, pore-filling ice, or ice-cemented regolith), its abundance and vertical variability, and its potential origin and evolutionary pathways. To address this gap, the Chang’E-7 mini-flying probe will carry the lunar soil Water molecule Analyser (LUWA) to conduct in-situ detection of water ice at the permanently shadowed region for the first time. This paper describes the compositional structure of LUWA and the detection approach, comprising drilling, sampling, sealing, heating and analysis. We detail the calibration parameters, apparatus, and procedures for its three core analytical modules: the Tunable Diode Laser Absorption Spectrometer (TDLAS), the Time-of-Flight Mass Spectrometer (TOF-MS), and the Differential optical Absorption Spectrometer (DAS). The operational chain is designed to release water through thermal extraction, quantify water content with high sensitivity across a wide dynamic range, and enable the determination of D/H isotopic signatures. A systematic ground calibration methodology and a unified calibration framework are established for three functional modules dedicated to water measurement. The framework defines calibration objectives, procedures, and traceability pathways to characterize module response functions, assess background and temperature-dependent effects, verify detection limits and linearity, and evaluate accuracy and repeatability, thereby supporting robust conversion from raw observables to calibrated water-content and isotope products in flight. In parallel, a dedicated lunar in-situ exploration test platform is developed to replicate LUWA’s full operational workflow using lunar regolith simulants, including drilling, sampling, sealing, heating, and analysis. Integrated tests validate key performance metrics and the measurement workflow, providing crucial technical support for interpreting Chang’E-7 LUWA data and for assessing the abundance and occurrence of water ice in lunar soil within PSRs. -
图 4 可调谐激光光谱仪定标装置原理
Figure 4. Schematic of the tunable laser spectrometer calibration device
图 6 差分吸收光谱仪定标装置原理
Figure 6. Schematic diagram of the differential absorption spectrometer calibration device
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