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Proceedings Paper

Sampling Aerosol By In Situ Versus Standard Methods: Some Results From Recent Experiments And Developmental Work
Author(s): Robert G. Knollenberg
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Paper Abstract

Recent work comparing results of sampling aerosol through ductwork, with impactors, and by other standard methods versus in situ methods are presented for three aerosol environments: Airborne measurements of atmospheric aerosol, at high temperatures inside a smoke stack, and in a laboratory environment at very high concentrations. The airborne work involves the comparison of particle size distributions measured by an in situ sizing instrument inside a wind tunnel with that obtained through ductwork using an isokinetic intake. The results show a sharp decrease in particle numbers measured in the ductwork at sizes above a few microns, in all cases, with negligible losses in the submicron range. A water cooled in-stack particle size spectrometer is being developed for the EPA. In situ measured size distributions will be compared to impactor samples and integrated extinction coefficients with transmissometer opacity values. A high concentration in situ measuring laboratory instrument is described which can perform measurements in the 0.3 to 6.0 µm size range at concentrations up to 107cm-3 without dilution.

Paper Details

Date Published: 18 August 1978
PDF: 14 pages
Proc. SPIE 0142, Optical Properties of the Atmosphere, (18 August 1978); doi: 10.1117/12.956528
Show Author Affiliations
Robert G. Knollenberg, Particle Measuring Systems, Inc. (United States)


Published in SPIE Proceedings Vol. 0142:
Optical Properties of the Atmosphere
Robert Sepucha, Editor(s)

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