15 October 2012 Instrumentation and first results of the reflected solar demonstration system for the Climate Absolute Radiance and Refractivity Observatory
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Abstract
The Climate Absolute Radiance and Refractivity Observatory (CLARREO) mission key goals include enabling observation of high accuracy long-term climate change trends, use of these observations to test and improve climate forecasts, and calibration of operational and research sensors. The spaceborne instrument suites include a reflected solar (RS) spectroradiometer, emitted infrared spectroradiometer, and radio occultation receivers. The requirement for the RS instrument is that derived reflectance must be traceable to SI standards with an absolute uncertainty of <0.3% and the error budget that achieves this requirement is described in previous work. This work describes the Solar/Lunar Absolute Reflectance Imaging Spectroradiometer (SOLARIS), a calibration demonstration system for RS instrument, and presents initial calibration and characterization methods and results. SOLARIS is an Offner spectrometer with two separate focal planes each with its own entrance aperture and grating covering spectral ranges of 320-640, 600-2300 nm over a full field-of-view of 10 degrees with 0.27 milliradian sampling. Results from laboratory measurements including use of integrating spheres, transfer radiometers and spectral standards combined with field-based solar and lunar acquisitions are presented.
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J. McCorkel, J. McCorkel, K. Thome, K. Thome, J. Hair, J. Hair, B. McAndrew, B. McAndrew, D. Jennings, D. Jennings, D. Rabin, D. Rabin, A. Daw, A. Daw, A. Lunsford, A. Lunsford, } "Instrumentation and first results of the reflected solar demonstration system for the Climate Absolute Radiance and Refractivity Observatory", Proc. SPIE 8510, Earth Observing Systems XVII, 85100B (15 October 2012); doi: 10.1117/12.930950; https://doi.org/10.1117/12.930950
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