Particle size detection device having high sensitivity in high m

Details Particle size detection device having high sensitivity in high m Particle size detection device having high sensitivity in high m

1986-04-14

1989-01-17

Rosenberger, R. A.

Optics: measuring and testing

For size of particles

By particle light scattering

356343, G01N 1502, G01N 2100

Patent

active

047984651

ABSTRACT:
A detection device is disclosed for determining particle size from particle effected light scattering in a sensing region receiving the particles in a gas carrier, such as air, and a laser beam to illuminate the sensing region. Background light from molecular scattering is reduced to a level that enables light scattered by particles having a size of at least as low as about 0.1 micron to be sensed in a high background of molecular scattering such as, for example, where molecular scattering can exceed the 0.1 micron particle's scattering by one hundred times. High molecular scattering is generated whenever the gas volume being viewed is large as is required for high flow rates, high molecular density (high pressures), or large gas molecules. This high sensitivity at high molecular scattering background is achieved through use of a linear array of detectors positioned, with respect to an imaging system, so that each detector monitors a different portion of the sensing region and provides an electrical output signal indicative of sensed particle presence within that portion monitored. The output signals from the detectors are parallel processed and coupled to a converter which provides an output indicative of the particles sensed in the entire sensing region.

REFERENCES:
patent: 3941982 (1976-03-01), Knollenberg et al.
patent: 4173415 (1979-11-01), Wyatt
patent: 4274745 (1981-06-01), Takahashi et al.
patent: 4429995 (1984-02-01), Goulas
"Detection and Sizing of Small Particles in an Open Cavity Gas Laser", Applied Optics, vol. 11, No. 7, Jul. 1972, pp. 1515-1520.
The Measurement of Particle Sizes Below Oil Micrometers, Robert Knollenberg, 2-85, Journal of Environmental Sciences.

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