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Proceedings Paper

Measurement of the aerosol component of the modulation transfer function in desert atmospheres
Author(s): Carlos McDonald; Gonzalo Romero; Carmen Ortiz; Jesus Carbajal
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Paper Abstract

A unique experimental technique has made it possible to make measurements in desert atmospheres of the horizontal modulation transfer function (MTFA) and its components which are attributed to contrast, aerosols, and turbulence. In particular, use of this technique has made it possible, for the first time, to directly measure the low spatial frequency cutoff of the aerosol component. This technique is based on utilizing digital image processing of remote video scenes that include two, optically identical, castellated targets which are located at different distances and are contrasted against the horizon sky. Ratios of contrast and FFT calculations may be used to determine the absolute values and spatial cutoff frequencies of the MTFA and its three components, independent of the imaging system and actual properties of the targets. The experimental technique is described along with preliminary MTFA measurements of the aerosol component.

Paper Details

Date Published: 1 August 1992
PDF: 13 pages
Proc. SPIE 1688, Atmospheric Propagation and Remote Sensing, (1 August 1992); doi: 10.1117/12.137945
Show Author Affiliations
Carlos McDonald, Univ. of Texas/El Paso (United States)
Gonzalo Romero, Univ. of Texas/El Paso (United States)
Carmen Ortiz, Univ. of Texas/El Paso (United States)
Jesus Carbajal, Univ. of Texas/El Paso (United States)

Published in SPIE Proceedings Vol. 1688:
Atmospheric Propagation and Remote Sensing
Anton Kohnle; Walter B. Miller, Editor(s)

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