Optical apparatus and method for sensing particulates

Details Optical apparatus and method for sensing particulates Optical apparatus and method for sensing particulates

1992-08-10

1994-05-24

Dzierzynski, Paul M.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250340, 356336, G01N 2149

Patent

active

053151151

ABSTRACT:
The present invention relates to an apparatus and method of determining particulate integrated properties consisting of integrated volume concentration, integrated surface area concentration and aerosol extinction coefficient in the infrared portion of the light spectrum using a noncollimated light beam irradiating suspended particulates. A light trap is placed in front of the lens that collects the light scattered by the particulates. Two separate detectors are placed differently with respect to the noncollimated beam to measure the light scattered by the particulates. Variable transmission filters are placed in front of the detectors to correct for the distortions in the light scattered by the particulates due to the off-axis intensity of the noncollimated beam.

REFERENCES:
patent: 3705771 (1972-12-01), Friedman et al.
patent: 3873206 (1975-03-01), Wilcock
patent: 4037964 (1977-07-01), Wertheimer et al.
patent: 4363551 (1982-12-01), Achter et al.
patent: 4597666 (1986-07-01), Gerber et al.
Wertheimer et al., "Light Scattering Measurements of Particle Distributions", Applied Optics, vol. 15, No. 6:1616-1620 (U.S.A. Jun. 1976).
Blyth et al., "An Optical Device for the Measurement of Liquid Water Content in Clouds", Quart. J. R. Met. Soc., 110:53-63 (Great Britain, 1984).

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