Comparison Of Methods Used To Determine The Mass Extinction Coefficient For Phosphorus Smokes

W. M. Farmer; K. L. Krist

doi:10.1117/12.932691

30 December 1981 Comparison Of Methods Used To Determine The Mass Extinction Coefficient For Phosphorus Smokes

W. M. Farmer, K. L. Krist

Proceedings Volume 0305, Atmospheric Effects on Electro-Optical, Infrared, and Millimeter Wave Systems Performance; (1981) https://doi.org/10.1117/12.932691
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

Abstract

Fourier transform analysis of data obtained during Smoke Week III indicates that the mass extinction coefficient for phosphorus smokes appears to be similar to a stochastic variable with a nonstationary mean. In the present work, this analysis is extended to examine the temporal dependence of the mass extinction coefficient for 1) selected wavelengths in the 6 - 12 micrometre band over a 5m path, and 2) for 3.4 micrometres over a path approaching 100m. The nonstationary mean values obtained with the Fourier transform analysis are then compared to those obtained using particle size distribution data. The comparison shows reasonably good consistency between the two sets of data and suggests that, in at least some cases, the mass extinction coefficient should not be treated as an "optical constant" of the smoke.

Citation Download Citation

W. M. Farmer and K. L. Krist "Comparison Of Methods Used To Determine The Mass Extinction Coefficient For Phosphorus Smokes", Proc. SPIE 0305, Atmospheric Effects on Electro-Optical, Infrared, and Millimeter Wave Systems Performance, (30 December 1981); https://doi.org/10.1117/12.932691

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