Measurement of modulation transfer function of desert atmospheres

Carlos McDonald

doi:10.1117/12.46563

1 July 1991 Measurement of modulation transfer function of desert atmospheres

Carlos McDonald

Proceedings Volume 1487, Propagation Engineering: Fourth in a Series; (1991) https://doi.org/10.1117/12.46563
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

A unique research program is being conducted for passive, remote sensing of horizontal contrast transmittance and the modulation transfer function (MTFA) of desert atmospheres, including the DC, low, and high spatial frequency MTFA components that are attributed to contrast, aerosols, and turbulence, respectively. The research makes it possible, for the first time, to measure the overall low spatial frequency response of the aerosol MTFA components of actual desert atmospheres. The required measurements are based on utilizing digital image processing of remote video scenes which include two optically-identical castellated targets, contrasted against the horizon sky background. Ratios of apparent contrast and MTF measurements of these two targets are used to determine the contrast transmittance and MTFA in the atmospheric region between the two targets, independent of the imaging system and the actual optical properties of the targets. The experimental technique is described along with current MTFA measurements.

Citation Download Citation

Carlos McDonald "Measurement of modulation transfer function of desert atmospheres", Proc. SPIE 1487, Propagation Engineering: Fourth in a Series, (1 July 1991); https://doi.org/10.1117/12.46563

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KEYWORDS

Modulation transfer functions

Spatial frequencies

Cameras

Transmittance

Aerosols

Atmospheric particles

Atmospheric optics

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