Evaluation of equivalent spheres for use in modeling nonspherical aerosol modulation transfer functions

Michael T. Valley

doi:10.1117/12.154815

15 September 1993 Evaluation of equivalent spheres for use in modeling nonspherical aerosol modulation transfer functions

Michael T. Valley

Author Affiliations +

Proceedings Volume 1968, Atmospheric Propagation and Remote Sensing II; (1993) https://doi.org/10.1117/12.154815
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

This paper evaluates equivalent sphere approaches for modeling nonspherical aerosols in MTFs calculations. A Monte Carlo simulation is used to calculate the image of point source in a scattering medium. The MTF is then found using a 2-D FFT on the resulting image (power distribution). The aerosol phase functions are computed using Mie theory for spherical particles and the Method of Extended Boundary Conditions for nonspherical particles. Spheres with radii determined by the nonspherical aerosol volume, surface area, orientation averaged radius, semi-minor axis length, and semi-major axis length are considered. Sample MTF results are presented for a 2:1 axial ratio prolate spheroid at a wavelength of 9.2 micrometers .

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Michael T. Valley "Evaluation of equivalent spheres for use in modeling nonspherical aerosol modulation transfer functions", Proc. SPIE 1968, Atmospheric Propagation and Remote Sensing II, (15 September 1993); https://doi.org/10.1117/12.154815

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