27 September 2007 Pre-launch characterization of aqua MODIS scan mirror response versus scan angle for thermal emissive bands
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Abstract
The double-sided paddle wheel scan mirror is the key optical component of the Moderate Resolution Imaging Spectroradiometer (MODIS) on-board the NASA EOS Terra and Aqua satellites. At a constant rotating speed, the scan mirror continuously reflects the Earth's top-of-atmosphere radiances through the instrument nadir aperture door and onto four focal plane assemblies (FPA), which consist of 36 spectral bands. Of those 36 bands, 16 are thermal emissive bands (TEB) with wavelengths ranging from 3.7 to 14.4μm. While this cross-track scanning system provides the Earth scene observations over a range of ±55° viewing angles from the nadir, the on-orbit calibration for TEB is performed by an On-Board Calibrator Blackbody (OBC BB) at a fixed viewing angle. The response versus scan angle (RVS) of the scan mirror is sensitive to the MODIS radiometric calibration. This paper describes how the pre-launch TEB RVS of the Aqua MODIS was characterized at the instrument system level by using ground support equipment, a Blackbody Calibration Source (BCS). The RVS test setup, test procedure, data analysis, derivation of RVS, and the fitting uncertainty are discussed in the paper. A separate paper that gives similar RVS analysis for the MODIS Reflective Solar Bands (RSB) is presented in this proceeding.
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Kwo-Fu Chiang, Kwo-Fu Chiang, Xiaoxiong Xiong, Xiaoxiong Xiong, } "Pre-launch characterization of aqua MODIS scan mirror response versus scan angle for thermal emissive bands", Proc. SPIE 6677, Earth Observing Systems XII, 66771J (27 September 2007); doi: 10.1117/12.731562; https://doi.org/10.1117/12.731562
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