Prediction of atmospheric extinction coefficient and comparison of transmission measurement methods: black target contrast versus aerosol scattering calculations

Itai Dror; S. Atar; Norman S. Kopeika

doi:10.1117/12.151055

13 August 1993 Prediction of atmospheric extinction coefficient and comparison of transmission measurement methods: black target contrast versus aerosol scattering calculations

Itai Dror, S. Atar, Norman S. Kopeika

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Proceedings Volume 1967, Characterization, Propagation, and Simulation of Sources and Backgrounds III; (1993) https://doi.org/10.1117/12.151055
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

Path integrated atmospheric transmittance over a 5.5 km horizontal path is measured using black target contrast. Measurements of on-line particulate distributions by Particulate Measuring System instrumentation (PMS) and of meteorological parameters are also made. The extinction coefficients, primarily scattering, of aerosols are calculated using the PMS data, and those arising from molecular absorption are calculated by LOWTRAN7. Both extinction coefficients, the directly measured path integrated and those calculated from particulate distribution and meteorological parameters near the receiver, are compared. Good agreement exists especially when relative humidity is low, despite the fact that the second method involves aerosol size distribution by data collected from a single point along the atmospheric path. Disagreement between both methods under high values of relative humidity can be explained by classification errors of the PMS instrumentation because of changes in the index of refraction of particles in a humid environment.

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Itai Dror, S. Atar, and Norman S. Kopeika "Prediction of atmospheric extinction coefficient and comparison of transmission measurement methods: black target contrast versus aerosol scattering calculations", Proc. SPIE 1967, Characterization, Propagation, and Simulation of Sources and Backgrounds III, (13 August 1993); https://doi.org/10.1117/12.151055

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KEYWORDS

Mass attenuation coefficient

Atmospheric particles

Humidity

Aerosols

Phase modulation

Atmospheric modeling

Meteorology

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