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18 November 1977 Recent Advances In Optical Particle Size Spectroscopy
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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.
© (1977) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert G. Knollenberg "Recent Advances In Optical Particle Size Spectroscopy", Proc. SPIE 0125, Advances in Laser Technology for the Atmospheric Sciences, (18 November 1977);

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