Terrestrial measurement of the performance of high-rejection optical baffling systems

Details Terrestrial measurement of the performance of high-rejection optical baffling systems Terrestrial measurement of the performance of high-rejection optical baffling systems

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977opten..16..412k&link_type=abstract

Optical Engineering, vol. 16, July-Aug. 1977, p. 412-416. Research supported by the U.S. Defense Nuclear Agency and U.S. Air Fo

Physics

Optics

1

Atmospheric Scattering, Baffles, Exosphere, Optical Measuring Instruments, Radiation Measurement, Aerosols, Atmospheric Attenuation, Atmospheric Optics, Calibrating, Computer Programs, Mie Scattering, Monte Carlo Method, Prediction Analysis Techniques, Radiometers, Rayleigh Scattering

Scientific paper

Spatial rejection is critical when exo-atmospheric or in situ radiometric measurements of faint sources are made in the presence of relatively intense sources such as the sun, moon, or earth. Scattering from atmospheric molecules and aerosols during evaluation in an earth-bound laboratory makes the high-rejection baffle appear to be less effective than it actually is in the measurement situation. A Monte Carlo computer program was written to predict the effects of atmospheric scattering on field-of-view calibration measurements of optical baffling systems. It was found that Mie scattering could be reduced in a clean room environment, and Rayleigh scattering was determined to be the limiting mechanism in a special chamber designed for off-axis measurements. The background flux at 40 deg off axis was found to be 1 billionth of the on-axis incident flux for a 5-deg full-angle baffle when illuminated by a 10.2-cm-diameter collimated beam. A two-step process was used to measure a baffle response at 40 deg off axis down to 1 hundred-billionth of the on-axis incident flux.

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