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Airspeed Corrections for Optical Array Probe Sample Volumes

Airspeed Corrections for Optical Array Probe Sample Volumes The Particle Measuring System’’s optical array probes have a sample volume that depends upon the diameter of the particle measured. The sample volume also depends upon the velocity of particles that pass through the probe because of the electronic response time of these instruments. This note discusses an algorithm that has been derived to calculate sample volume as a function of size and velocity, and demonstrates the need for such an algorithm by comparison of measurements from several types of optical array probes and a forward-scattering spectrometer probe. These comparisons show that the optical array probes greatly underestimate droplet concentrations of particles less than 100 μμ m in diameter at typical aircraft research speeds unless sample volumes are adjusted for electronic response time limitations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Atmospheric and Oceanic Technology American Meteorological Society

Airspeed Corrections for Optical Array Probe Sample Volumes

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References (9)

Publisher
American Meteorological Society
Copyright
Copyright © 1996 American Meteorological Society
ISSN
1520-0426
DOI
10.1175/1520-0426(1997)014<1224:ACFOAP>2.0.CO;2
Publisher site
See Article on Publisher Site

Abstract

The Particle Measuring System’’s optical array probes have a sample volume that depends upon the diameter of the particle measured. The sample volume also depends upon the velocity of particles that pass through the probe because of the electronic response time of these instruments. This note discusses an algorithm that has been derived to calculate sample volume as a function of size and velocity, and demonstrates the need for such an algorithm by comparison of measurements from several types of optical array probes and a forward-scattering spectrometer probe. These comparisons show that the optical array probes greatly underestimate droplet concentrations of particles less than 100 μμ m in diameter at typical aircraft research speeds unless sample volumes are adjusted for electronic response time limitations.

Journal

Journal of Atmospheric and Oceanic TechnologyAmerican Meteorological Society

Published: Sep 17, 1996

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