MODIS solar diffuser: modeled and actual performance

Eugene Waluschka; Joseph A. Esposito; Jun-Qiang Sun; Xindong Wang; Xiaoxiong Xiong

doi:10.1117/12.453448

18 January 2002 MODIS solar diffuser: modeled and actual performance

Eugene Waluschka, Joseph A. Esposito, Jun-Qiang Sun, Xindong Wang, Xiaoxiong Xiong

Proceedings Volume 4483, Earth Observing Systems VI; (2002) https://doi.org/10.1117/12.453448
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

The MODIS instrument's solar diffuser is used in its radiometric calibration for the reflective solar bands (VIS, NIR, and SWIR) ranging from 0.41 to 2.1 micron. The sun illuminates the solar diffuser either directly or through an attenuation screen. The attenuation screen consists of a regular array of pin holes. The attenuated illumination pattern on the solar diffuser is not uniform, but consists of a multitude of pin-hole images of the sun. This non-uniform illumination produces small, but noticeable radiometric effects. A description of the computer model used to simulate the effects of the attenuation screen is given and the predictions of the model are compared with actual, on-orbit, calibration measurements.

Citation Download Citation

Eugene Waluschka, Joseph A. Esposito, Jun-Qiang Sun, Xindong Wang, and Xiaoxiong Xiong "MODIS solar diffuser: modeled and actual performance", Proc. SPIE 4483, Earth Observing Systems VI, (18 January 2002); https://doi.org/10.1117/12.453448

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