Transmissometer having solid state light source

Details Transmissometer having solid state light source Transmissometer having solid state light source

1988-08-22

1990-06-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356437, 356438, 250205, G01N 2159

Patent

active

049374613

ABSTRACT:
An improved transmissometer and optical assembly therefor contains a solid state light source preferably a light emitting diode. The ligh source emits a low level light beam that is split, part of which is passed through a gaseous sample then directed to a detector while the otehr part is directed to a second detector. Electronic components are provided to use signals from the detectors to control the light source and determine opacity of the sample.

REFERENCES:
patent: 3917957 (1975-11-01), Ansevin et al.
patent: 4249244 (1981-02-01), Shofner et al.
patent: 4589775 (1986-05-01), Milhous, Jr. et al.

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