On-orbit radiometric calibration using a solar diffuser
Radiometric calibration of spacecraft sensors using an on-board diffuser has become an accepted method in recent years for sensors operating in the solar-reflective portion of the spectrum. In many of...
MODIS solar diffuser stability monitor performance
A Solar Diffuser (SD) panel, made of Spectralon, is used for the on-orbit calibration of MODIS reflective solar bands in the spectral range from 0.41 to 2.1 micron. A Solar Diffuser Stability Monitor ...
MODIS solar diffuser: modeled and actual performance
Proc. SPIE, Vol. 4483, 146 (2002);
doi:10.1117/12.453448
Online Publication Date: 24 April 2003
Conference Date: Wednesday 01 August 2001
Conference Location: San Diego, CA, USA
Conference Title: Earth Observing Systems VI
Conference Chairs: William L. Barnes
TheMODIS instrument's solar diffuser is used in its radiometric calibrationfor the reflective solar bands (VIS, NIR, and SWIR) rangingfrom 0.41 to 2.1 micron. The sun illuminates the solardiffuser either directly or through an attenuation screen. The attenuationscreen consists of a regular array of pin holes. Theattenuated illumination pattern on the solar diffuser is not uniform,but consists of a multitude of pin-hole images of thesun. This non-uniform illumination produces small, but noticeable radiometric effects.A description of the computer model used to simulate theeffects of the attenuation screen is given and the predictionsof the model are compared with actual, on-orbit, calibration measurements.
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