Radiometric calibration of the SwRI ultraviolet reflectance chamber (SwURC) far-ultraviolet reflectometer

Preston L. Karnes; Kurt D. Retherford; Gregory S. Winters; Eric C. Bassett; Stephen M. Escobedo; Edward L. Patrick; Amanda Richter; Michael W. Davis; Paul F. Miles; Joel W. Parker; G. Randall Gladstone; Thomas K. Greathouse; Eric R. Schindhelm; Lori M. Feaga; S. Alan Stern

doi:10.1117/12.2024460

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26 September 2013 Radiometric calibration of the SwRI ultraviolet reflectance chamber (SwURC) far-ultraviolet reflectometer

Preston L. Karnes, Kurt D. Retherford, Gregory S. Winters, Eric C. Bassett, Stephen M. Escobedo, Edward L. Patrick, Amanda Richter, Michael W. Davis, Paul F. Miles, Joel W. Parker, G. Randall Gladstone, Thomas K. Greathouse, Eric R. Schindhelm, Lori M. Feaga, S. Alan Stern

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Proceedings Volume 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII; 88590R (2013) https://doi.org/10.1117/12.2024460
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

The Southwest Research Institute Ultraviolet Reflectance Chamber (SwURC) is a highly capable UV reflectometer chamber and data acquisition system designed to provide bidirectional scattering data of various surfaces and materials. The chamber provides laboratory-based UV reflectance measurements of water frost/ice, lunar soils, simulants, and analogs to support interpretation of UV reflectance data from the Lyman Alpha Mapping Project (LAMP) Lunar Reconnaissance Orbiter (LRO). A deuterium lamp illuminates a monochromator with a nominal wavelength range of 115 nm to 210 nm. The detector scans emission angles -85° to +85°in the principal plane. Liquid nitrogen passed through the sample mount enables constant refrigeration of tray temperatures down to 78 K to form water ice and other volatile samples. The SwURC can be configured to examine a wide range of samples and materials through the use of custom removable sample trays, connectors, and holders. Calibration reference standard measurements reported here include Al/MgF₂ coated mirrors for specular reflection and Fluorilon for diffuse reflectances. This calibration work is a precursor to reports of experiments measuring the far-UV reflectance of water frost, lunar simulants, and Apollo soil sample 10084 in support of LRO-LAMP.

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Preston L. Karnes, Kurt D. Retherford, Gregory S. Winters, Eric C. Bassett, Stephen M. Escobedo, Edward L. Patrick, Amanda Richter, Michael W. Davis, Paul F. Miles, Joel W. Parker, G. Randall Gladstone, Thomas K. Greathouse, Eric R. Schindhelm, Lori M. Feaga, and S. Alan Stern "Radiometric calibration of the SwRI ultraviolet reflectance chamber (SwURC) far-ultraviolet reflectometer", Proc. SPIE 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII, 88590R (26 September 2013); https://doi.org/10.1117/12.2024460

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