Measurement of the aerosol component of the modulation transfer function in desert atmospheres

Carlos McDonald; Gonzalo Romero; Carmen Ortiz; Jesus Carbajal

doi:10.1117/12.137945

1 August 1992 Measurement of the aerosol component of the modulation transfer function in desert atmospheres

Carlos McDonald, Gonzalo Romero, Carmen Ortiz, Jesus Carbajal

Proceedings Volume 1688, Atmospheric Propagation and Remote Sensing; (1992) https://doi.org/10.1117/12.137945
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

A unique experimental technique has made it possible to make measurements in desert atmospheres of the horizontal modulation transfer function (MTF_A) 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 MTF_A and its three components, independent of the imaging system and actual properties of the targets. The experimental technique is described along with preliminary MTF_A measurements of the aerosol component.

Citation Download Citation

Carlos McDonald, Gonzalo Romero, Carmen Ortiz, and Jesus Carbajal "Measurement of the aerosol component of the modulation transfer function in desert atmospheres", Proc. SPIE 1688, Atmospheric Propagation and Remote Sensing, (1 August 1992); https://doi.org/10.1117/12.137945

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