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<p><i>In-situ</i> spectroscopy serves as a critical bridge between laboratory analysis of returned samples and orbital remote sensing of planetary surfaces. During China's Chang'e-6 (CE-6) mission, the first mission to return samples from the lunar farside, the Lunar Mineral Spectrometer (LMS) experienced internal temperatures exceeding 74&#xa0;°C, threatening the fidelity of spectral measurements and undermining cross-scale comparisons. Here, we develop a Temperature-Compensated Radiometric Calibration (TCRC) framework to correct thermally induced measurement deviations. The framework improves the consistency of repeated observations acquired at different instrument temperatures by approximately 65%, while maintaining a signal-to-noise ratio above 40 dB under peak-temperature conditions. The corrected dataset enables cross-scale validation of surface properties at the lunar farside landing area. FeO abundance retrieved from LMS (15.36 – 19.54 wt%) agrees with both orbital Kaguya MI data (17.42 wt%) and returned sample analyses (~17.2 wt%). Centimeter-scale mapping on the Chang’e-6 landing area further reveals spatial heterogeneity in optical maturity and water content associated with lander plume disturbance. These results demonstrate that the TCRC framework supports reliable <i>in-situ</i> spectral acquisition under thermal extremes lunar surface conditions. Furthermore, the corrected spectra enable cross-scale validation and provide a practical reference for future planetary spectroscopic payloads operating under thermally challenging environments.</p>

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High-fidelity in-situ spectroscopy under thermal extremes enables cross-scale validation of the Chang’e-6 landing area

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月30日

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  • Jinning Li,
  • Xuming Shi,
  • Bin Liu,
  • Rong Wang,
  • Zhendong Wang,
  • Meizhu Wang,
  • Gang Lv,
  • Liyin Yuan,
  • Qian Ma,
  • Guoliang Yuan,
  • Rui Xu,
  • Chunlai Li,
  • Fang Wang,
  • Zhiping He

摘要

In-situ spectroscopy serves as a critical bridge between laboratory analysis of returned samples and orbital remote sensing of planetary surfaces. During China's Chang'e-6 (CE-6) mission, the first mission to return samples from the lunar farside, the Lunar Mineral Spectrometer (LMS) experienced internal temperatures exceeding 74 °C, threatening the fidelity of spectral measurements and undermining cross-scale comparisons. Here, we develop a Temperature-Compensated Radiometric Calibration (TCRC) framework to correct thermally induced measurement deviations. The framework improves the consistency of repeated observations acquired at different instrument temperatures by approximately 65%, while maintaining a signal-to-noise ratio above 40 dB under peak-temperature conditions. The corrected dataset enables cross-scale validation of surface properties at the lunar farside landing area. FeO abundance retrieved from LMS (15.36 – 19.54 wt%) agrees with both orbital Kaguya MI data (17.42 wt%) and returned sample analyses (~17.2 wt%). Centimeter-scale mapping on the Chang’e-6 landing area further reveals spatial heterogeneity in optical maturity and water content associated with lander plume disturbance. These results demonstrate that the TCRC framework supports reliable in-situ spectral acquisition under thermal extremes lunar surface conditions. Furthermore, the corrected spectra enable cross-scale validation and provide a practical reference for future planetary spectroscopic payloads operating under thermally challenging environments.