28 December 1999 Methodology for determining band radiance change under SRCA illumination
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Abstract
The Spectro-Radiometric Calibration Assembly (SRCA) was calibrated prelaunch in thermal vacuum against a 100-cm spherical integration source for all 20 MODIS solar reflective bands. Two methods of tracking the SRCA radiance change from ground to orbit are addressed. The broadband radiance of the SRCA will be held constant by a temperature-controlled SiPD feedback signal. While in spectral mode a reference SiPD located in the optical path of the SRCA measures the spectral profile of the radiance. The ratio of the reference SiPD signals from two different calibrations indicates a spectral profile change of the SRCA source and, therefore, predicts the SRCA band radiance changes. The second method is based upon monitoring the SRCA lamp resistance, which is non-linearly related to the lamp temperature. This provides a prediction of the SRCA spectral component so that the SRCA radiance variation from the previous calibration will be known. This paper emphasizes prediction of band radiance change. It demonstrates that both approaches track the SIS(100) calibration to within 2% and the inter-comparison of the two methods is within 2%. The success of the tracking will provide a physical transfer from pre-launch to on-orbit.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Harry E. Montgomery, Nianzeng Che, Jeff Bowser, "Methodology for determining band radiance change under SRCA illumination", Proc. SPIE 3870, Sensors, Systems, and Next-Generation Satellites III, (28 December 1999); doi: 10.1117/12.373205; https://doi.org/10.1117/12.373205
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