Passive smoke plume opacity monitor

Details Passive smoke plume opacity monitor Passive smoke plume opacity monitor

1979-12-17

1982-03-23

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

356341, 356438, G01N 2184

Patent

active

043209750

ABSTRACT:
In the smoke opacity monitor disclosed herein, a measurement of opacity is obtained by measuring the proportion of polarized light from the background sky which is detectable through the smoke plume. Compensation and normalization is provided to minimize errors generated by illumination of the plume itself and for the overall intensity of the background sky light.

REFERENCES:
patent: T947008 (1976-06-01), Hundal
patent: 3554655 (1971-01-01), Einstein
patent: 3640626 (1972-02-01), Liskowitz
patent: 3841763 (1974-10-01), Lewis
patent: 3868186 (1975-02-01), Paukert et al.
patent: 3901602 (1975-08-01), Gravatt
Conner et al. "Optical Properties and Visual Effects of Smoke-Stack Plumes" Office of Air Programs Publication No. AP-30, U.S. Environmental Protection Agency, May 1972.

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