Effect of water vapor absorption on integrating sphere output radiance and consequences for instrument calibration

Steven E. Platnick; Peter Abel; Michael D. King

doi:10.1117/12.258102

11 November 1996 Effect of water vapor absorption on integrating sphere output radiance and consequences for instrument calibration

Steven E. Platnick, Peter Abel, Michael D. King

Author Affiliations +

Proceedings Volume 2820, Earth Observing System; (1996) https://doi.org/10.1117/12.258102
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Multiple photon scatterings inside an integrating sphere can result in significant path lengths compared with line-of- sight sources. In strong water vapor absorption channels, such as those on MODIS and the MODIS airborne simulator, these internal path lengths can result in a significant reduction in sphere output radiance. Path length probability distributions for photons exiting a sphere are determined using Monte Carlo calculations. Approximate analytic expressions are also derived. Results are used to determine the effect of water vapor absorption on integrating sphere sensor calibrations in several pertinent channels.

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Steven E. Platnick, Peter Abel, and Michael D. King "Effect of water vapor absorption on integrating sphere output radiance and consequences for instrument calibration", Proc. SPIE 2820, Earth Observing System, (11 November 1996); https://doi.org/10.1117/12.258102

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