Smoke opacity meter

Details Smoke opacity meter Smoke opacity meter

1983-07-29

1985-10-01

Pianalto, Bernard D.

Optics: measuring and testing

For light transmission or absorption

By comparison

356437, 356438, 356439, G01N 2100

Patent

active

045442738

ABSTRACT:
Apparatus for controllably admitting a sample volume of engine exhaust into a bifurcated, closed-loop opacity chamber and wherein the exhaust sample is controllably directed away from the internal optics via symmetric flow inducing air guides. A pulsed light source is controllably directed through the opacity chamber and exhaust sample and the detected light is compared to a reference level so as to determine a relative measure of the sample's opacity. Attendant control circuitry permits the selected display of corresponding sample opacity and density values.

REFERENCES:
patent: 3826577 (1974-07-01), Irwin

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