One of the key problems in determining lunar surface composition for thermal-infrared measurements is the lack of comparable laboratory-measured spectra. As the surface is typically composed of fine-grained particulates, the lunar environment induces a thermal gradient within the near sub-surface, altering the emission spectra: this environment must therefore be simulated in the laboratory, considerably increasing the complexity of the measurement. Previous measurements have created this thermal gradient by either heating the cup in which the sample sits or by illuminating the sample using a solar-like source. This is the first setup able to measure in both configurations, allowing direct comparisons to be made between the two. Also, measurements across a wider spectral range and at a much higher spectral resolution can be acquired using this new setup. These are required to support new measurements made by the Diviner Lunar Radiometer, the first multi-spectral thermal-infrared instrument to orbit the Moon. Results from the two different heating methods are presented, with measurements of a fine-grained quartz sample compared to previous similar measurements, plus measurements of a common lunar highland material, anorthite. The results show that quartz gives the same results for both methods of heating, as predicted by previous studies, though the anorthite spectra are different. The new calibration pipeline required to convert the raw data into emissivity spectra is described also.
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December 2012
Research Article|
December 26 2012
A new experimental setup for making thermal emission measurements in a simulated lunar environment
I. R. Thomas;
I. R. Thomas
a)
1Atmospheric, Oceanic and Planetary Physics Department,
University of Oxford
, Oxford, United Kingdom
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B. T. Greenhagen;
B. T. Greenhagen
2Jet Propulsion Laboratory,
California Institute of Technology
, Pasadena, California 91109, USA
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N. E. Bowles;
N. E. Bowles
1Atmospheric, Oceanic and Planetary Physics Department,
University of Oxford
, Oxford, United Kingdom
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K. L. Donaldson Hanna;
K. L. Donaldson Hanna
3Department of Geological Sciences,
Brown University
, Providence, Rhode Island 02912, USA
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J. Temple;
J. Temple
1Atmospheric, Oceanic and Planetary Physics Department,
University of Oxford
, Oxford, United Kingdom
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S. B. Calcutt
S. B. Calcutt
1Atmospheric, Oceanic and Planetary Physics Department,
University of Oxford
, Oxford, United Kingdom
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a)
Author to whom correspondence should be addressed. Electronic mail: thomas@atm.ox.ac.uk.
Rev. Sci. Instrum. 83, 124502 (2012)
Article history
Received:
May 30 2012
Accepted:
November 12 2012
Citation
I. R. Thomas, B. T. Greenhagen, N. E. Bowles, K. L. Donaldson Hanna, J. Temple, S. B. Calcutt; A new experimental setup for making thermal emission measurements in a simulated lunar environment. Rev. Sci. Instrum. 1 December 2012; 83 (12): 124502. https://doi.org/10.1063/1.4769084
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