Spherical and nonspherical aerosol and particulate characterization using optical pattern recognition techniques

Martin S. Marshall; Robert E. Benner

doi:10.1117/12.49703

1 November 1991 Spherical and nonspherical aerosol and particulate characterization using optical pattern recognition techniques

Martin S. Marshall, Robert E. Benner

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Proceedings Volume 1564, Optical Information Processing Systems and Architectures III; (1991) https://doi.org/10.1117/12.49703
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Optical pattern recognition techniques for characterizing spherical and nonspherical aerosols and particulates utilized by Dugway Proving Ground in their smoke and obscurant testing programs are presented. The three standard classes of unclassified military smokes and obscurants are included in this study, namely standard liquid aerosol smokes, fibrous obscurants, and flaked brass and graphite IR obscurants. The overall objectives of size distribution in nearly real time under conditions of high particulate loading are specified. A holographic version of the commercially available wedge-ring detector is described to replace the classical matched and phase-only filters, and some of the possible benefits are enumerated for characterizing the two classes of nonspherical obscurants. Computer simulations and experimental data collected for opaque spherical and nonspherical particles are included utilizing the classical matched filter, the phase-only filter and the holographic wedge-ring detector. Computer simulations are presented predicting the performance of a system where the output from the optical correlator utilizing the holographic wedge-ring detector is coupled directly into a optical processor to accomplish the decision making and classification tasks to enhance the speed and performance of the system

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Martin S. Marshall and Robert E. Benner "Spherical and nonspherical aerosol and particulate characterization using optical pattern recognition techniques", Proc. SPIE 1564, Optical Information Processing Systems and Architectures III, (1 November 1991); https://doi.org/10.1117/12.49703

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KEYWORDS

Particles

Spherical lenses

Phase only filters

Atmospheric particles

Optical correlators

Optical filters

Electronic filtering

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