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4 August 2010 Measuring the water vapor above the SOFIA Observatory
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The SOFIA airborne observatory flies in the lower stratosphere above more than 99.9% of the Earth's water vapor. As low as this residual water vapor is, it will still affect SOFIA's infrared and sub-millimeter astronomical observations. As a result, a heterodyne instrument operating at 183 GHz will be used to measure the integrated water vapor overburden in flight. The accuracy of the measured precipitable water vapor must be 2 microns or better, 3 sigma, and measured at least once a minute. This presentation will cover the design and the measured laboratory performance of this instrument, and will discuss other options for determining the water vapor overburden during the SOFIA Early Science shared-risk period.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas L. Roellig, Lunming Yuen, David Sisson, and Allan Meyer "Measuring the water vapor above the SOFIA Observatory", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773339 (4 August 2010);

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