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Proceedings Paper

Particle Sizing Interferometer Nephelometry
Author(s): W. Michael Farmer; J. Y. Son
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Paper Abstract

One of the most difficult optical instrumentation problems in the measurement of aerosol or droplet size distributions is to assure that accurate measurements have been made. Fully reliable standards against which aerosol and droplet measuring instrumentation can be compared and calibrated for in situ measurements do not yet exist. Therefore, it is desirable to compare one set of measurements against other independently made measurements to assure that consistent data are obtained. This work will describe how four independent measurements of particle size can be obtained simultaneously with the particle sizing interferometer (PSI). Examples of results from analytical studies intended to evaluate these techniques are presented. A result of this work has been to show how the PSI can be used as a polar nephelometer. This nephelometer can determine particle size, index of refraction, and a measure of particle symmetry by measuring both scattered intensity and visibility as a function of scatter angle. These PSI nephelometric studies have also found use in identifying appropriate angles where the scattered light collecting optics can be placed to obtain monotonic visibility or scattered intensity response functions to determine particle size.

Paper Details

Date Published: 11 November 1985
PDF: 10 pages
Proc. SPIE 0573, Particle Sizing and Spray Analysis, (11 November 1985); doi: 10.1117/12.978034
Show Author Affiliations
W. Michael Farmer, Science and Technology Corporation (United States)
J. Y. Son, The University of Tennessee Space Institute (United States)

Published in SPIE Proceedings Vol. 0573:
Particle Sizing and Spray Analysis
Norman Chigier; Gerald W. Stewart, Editor(s)

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