Lunar Mineralogical Spectrometer on Chang’E-5 Mission
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Published:2022-07-13
Issue:5
Volume:218
Page:
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ISSN:0038-6308
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Container-title:Space Science Reviews
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language:en
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Short-container-title:Space Sci Rev
Author:
Xu Rui,Li Chunlai,Yuan Liyin,Lv Gang,Xu Sheng,Li Feifei,Jin Jian,Wang Zhendong,Pan Wei,Wang Rong,Wang Meizhu,Xie Jianan,Yang Jie,Wang Jianyu,He Zhiping
Abstract
AbstractThe Lunar Mineralogical Spectrometer (LMS) is one of the main payloads on the Chang’E-5 (CE-5) lunar probe, belonging to the China Lunar Exploration Program. The scientific objective of the LMS is to explore the mineralogical composition and search for evidence of -OH/H2O in the sampling area. The LMS consists of an optomechanism unit, a dustproof calibration unit (DPCU) and an electronic unit. The LMS is installed on the lander about 1.4-m above the lunar surface, the field of view (FOV) is $4.17\times 4.17^{\circ }$
4.17
×
4.17
∘
, the instant FOV of the visible imaging channel is 0.28 mrad, and the typical spatial resolution is 0.56 mm/pixel @ 2 m distance. The rotation range of the 2D scanner is $\pm 22.5^{\circ}$
±
22.5
∘
along the azimuth axis and $0\sim 30^{\circ }$
0
∼
30
∘
along the elevation axis, making it possible to observe the sampling area or to select important observing targets. The dispersing beam uses acousto-optic tunable filters, and target detection is performed with a 2D scanner. The LMS acquires spectral imaging information covering 480–950 nm, and reflectance spectra of 900–3,200-nm, both at a 5-nm/band sampling interval. The spectral resolution is $2.4\sim 9.4\text{ nm}$
2.4
∼
9.4
nm
in the visible and near-infrared channels and $7.6\sim 24.9\text{ nm}$
7.6
∼
24.9
nm
in the short–medium-wave infrared channel. The LMS has a 588-band detection capability designed for fine spectral observation of sampling points and wields a 20-band full-view multi-spectral mode to observe candidate areas prior to sampling. The DPCU of the LMS is integrated with a calibration diffuser that is used for in-flight calibration on the lunar surface using solar irradiation, thus improving the quantitative level of scientific data.
Funder
National Natural Science Foundation of China Excellent Member of Youth Innovation Promotion Association CAS Youth Innovation Promotion Association of the Chinese Academy of Sciences Program of Shanghai Academic Research Leader National Science Fund for Distinguished Young Scholars
Publisher
Springer Science and Business Media LLC
Subject
Space and Planetary Science,Astronomy and Astrophysics
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