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Thermal Optical Properties of Lunar Dust Simulants and Their ConstituentsThe total reflectance spectra of lunar simulant dusts (< 20 mm particles) were measured in order to determine their integrated solar absorptance (alpha) and their thermal emittance (epsilon) for the purpose of analyzing the effect of dust on the performance of thermal control surfaces. All of the simulants except one had a wavelength-dependent reflectivity (p (lambda)) near 0.10 over the wavelength range of 8 to 25 microns and so are highly emitting at room temperature and lower. The 300 K emittance (epsilon) of all the lunar simulants except one ranged from 0.78 to 0.92. The exception was Minnesota Lunar Simulant 1 (MLS-1), which has little or no glassy component. In all cases the epsilon was lower for the < 20 micron particles than for larger particles reported earlier. There was considerably more variation in the lunar simulant reflectance in the solar spectral range (250 to 2500 nm) than in the thermal infrared. As expected, the lunar highlands simulants were more reflective in this wavelength range than the lunar mare simulants. The integrated solar absorptance (alpha) of the simulants ranged from 0.39 to 0.75. This is lower than values reported earlier for larger particles of the same simulants (0.41 to 0.82), and for representative mare and highlands lunar soils (0.74 to 0.91). Since the of some mare simulants more closely matched that of highlands lunar soils, it is recommended that and values be the criteria for choosing a simulant for assessing the effects of dust on thermal control surfaces, rather than whether a simulant has been formulated as a highlands or a mare simulant.
Document ID
20120000069
Document Type
Technical Memorandum (TM)
Authors
Gaier, James R. (NASA Glenn Research Center Cleveland, OH, United States)
Ellis, Shaneise (NASA Glenn Research Center Cleveland, OH, United States)
Hanks, Nichole (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 25, 2013
Publication Date
December 1, 2011
Subject Category
Lunar and Planetary Science and Exploration
Report/Patent Number
NASA/TM-2011-217232
E-17807-1
AIAA Paper 2011-3673
Meeting Information
3rd Atmospheric and Space Environments Conference(Honolulu, HI)
Funding Number(s)
WBS: WBS WBS 119103.04.05.18
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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