15 September 1993 Effect of smog and dust on the relative performance of mid- and far-infrared detectors
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Abstract
Ground level atmospheric extinction from 0.5 to 12 (mu) was determined as a function of date and time of day by a combination of direct visibility measurements and Mie calculations made using simultaneously measured particle size distributions. The measurements were made over a three month period in the Indian Wells Valley of the Mojave Desert during quiescent weather conditions. From previous work and a review of the literature an estimate was made of the composition of the dust and combustion produced aerosols. Results of Mie computations agree very well with direct visibility measurements. However, extinction in the 8 - 12 (mu) range was frequently greater than in the 3 - 5 (mu) range consistent with unquantified field observations made using HgCdTe detectors. This unexpected result is due to ammonium sulfate absorption bands centered at 7 and 8.8 (mu) indicating that a detector designed to have a narrow spectral response centered at 7 (mu) could experience difficulties. This work surveys detector data available in the open literature and compares the effect of detector spectral response on calculated transmission in the Indian Wells Valley as a function of time of day and frequency of occurrence of aerosol conditions.
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Philip L. Walker, Philip L. Walker, Larry A. Mathews, Larry A. Mathews, } "Effect of smog and dust on the relative performance of mid- and far-infrared detectors", Proc. SPIE 1968, Atmospheric Propagation and Remote Sensing II, (15 September 1993); doi: 10.1117/12.154878; https://doi.org/10.1117/12.154878
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