Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1985-05-20
1987-03-24
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250338, 250339, 350372, G02F 111, G01N 2135
Patent
active
046527567
ABSTRACT:
An improved automated acousto-optic analyzer system includes an acousto-optic tunable filter which is coupled with a source of radiation to produce pulsed light at predetermined wavelengths. This light is transmitted through a gas stack containing gases to be analyzed, to a distant detector. The configuration of the acousto-optic tunable filter, radiation source on one side of an environment of interest and a detector on the opposite side of an environment of interest produces spatial separation of the tuned, diffracted light from the undiffracted broad spectrum of the light source at the detector. This configuration eliminates the need for polarizers in the system. It also combines the tuning function of the AOTF with a chopping function, allowing extraneous radiation to be discriminated against. Thus the improved configuration of the disclosed invention permits effective operation of the gas analysis system in a gas stack characterized by extremely high ambient temperatures.
REFERENCES:
patent: 3644015 (1972-02-01), Hearn
patent: 4421411 (1983-12-01), Ida
Nelson Robert L.
Ryan Frederick M.
Fields Carolyn E.
Trempus Thomas R.
Westinghouse Electric Corp.
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