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Apparatus for Light Scattering Studies of Smoke Particles.


pdf icon Apparatus for Light Scattering Studies of Smoke Particles. (271 K)
Weinert, D. W.; Mulholland, G. W.

NIST SP 965; February 2001.

International Conference on Automatic Fire Detection "AUBE '01", 12th. Proceedings. National Institute of Standards and Technology. March 25-28, 2001, Gaithersburg, MD, Beall, K.; Grosshandler, W. L.; Luck, H., Editor(s)(s), 31-42 pp, 2001.

Keywords:

fire detection; fire detection systems; particles; light scattering; smoke; aerosols; computation; gravimeters

Abstract:

A facility for measuring the light scattered by smokes as a function of the scattering angle and linear polarization has been developed. By using monosize polystyrene calibration particles and filter collection for gravimeteric measurement, we are able for the first time to measure the differential (angular distribution) scattering cross section per mass of a flame generated smoke particle. This differential mass scattering cross section is a measure of the light scattering strength of a particle in units of area per mass. The light scattering apparatus used in these measurements has provided repeatable results over a dynamic signal range of 3 to 4 orders of magnitude. Uncertainties lie in the range of 10 % to 20 % and are mainly due to the angular averaging of the calibration factor. The method and apparatus developed was then applied to acetylene smoke, which was produced in a consistent and reproducible manner by a co-flow laminar diffusion burner.