Technique for visible calibration of future GOES sensors by solar viewing through a perforated screen

James C. Bremer; Guojun Si

doi:10.1117/12.254107

18 October 1996 Technique for visible calibration of future GOES sensors by solar viewing through a perforated screen

James C. Bremer, Guojun Si

Proceedings Volume 2812, GOES-8 and Beyond; (1996) https://doi.org/10.1117/12.254107
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Future GOES missions, augmented by the addition of very stable visible calibration, could measure long-term changes in the earth's albedo. Direct sunlight can be viewed through a plate perforated by small holes, attenuating the radiance at the center of the solar image by both blockage and diffraction. Attenuation by a factor of 50,000 produces a full-aperture, end-to-end calibration source with radiance comparable to a high-albedo target. Since its radiance depends only upon geometry, the perforated plate technique avoids the materials degradation problems inherent to calibration techniques based on reflection or refraction. Our analysis indicates that a plate with 50 micrometers holes spaced 4.9 mm apart in a hexagonal array has the potential to satisfy the requirement for a source stable to < 1 percent over a 5-year GOES mission. Some randomization of the hole positions may be desirable to suppress interference effects. We have made preliminary measurements of the large- scale angular structure of a simulated solar image viewed through a perforated screen, and have demonstrated their agreement with out theoretical predictions.

Citation Download Citation

James C. Bremer and Guojun Si "Technique for visible calibration of future GOES sensors by solar viewing through a perforated screen", Proc. SPIE 2812, GOES-8 and Beyond, (18 October 1996); https://doi.org/10.1117/12.254107

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