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Proceedings Paper

Recent Advances In Optical Particle Size Spectroscopy
Author(s): Robert G. Knollenberg
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Paper Abstract

Optical techniques continue today as our most extensive methodology in sizing particles. Imaging and light scattering methods are used most extensively. Recent work in light scattering aerosol sizing methods involve Active Scattering with light collection over a 211 steradian solid angle, an off-axis technique with application to in situ measurements at concentrations up to 107cm -3, and a single particle multiprobe wherein five separate measurements are performed on a single particle. Imaging systems useful in sizing particles larger than a few microns have also been improved; for instance, an Optical Array Spectrometer has been expanded to provide multilevel isodensitometry with an imaging bandwidth above 1 GHz. The use of an image dissector with multiple apertures is shown to have both light scattering and imaging potential. The evaluation of sampling techniques for special testing include wind tunnel evaluations of aircraft mounted isokinetic sampling probes, ground aspirators for large airborne particles, hot sampling sections for high temperature particle sources, and an in situ particle size spectrometer for in-stack measurements.

Paper Details

Date Published: 18 November 1977
PDF: 1 pages
Proc. SPIE 0125, Advances in Laser Technology for the Atmospheric Sciences, (18 November 1977); doi: 10.1117/12.955880
Show Author Affiliations
Robert G. Knollenberg, Particle Measuring Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 0125:
Advances in Laser Technology for the Atmospheric Sciences
Wally W. Moore; James D. Trolinger, Editor(s)

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