Infrared gas detector

Details Infrared gas detector Infrared gas detector

1985-10-01

1987-09-15

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250343, G01N 2161

Patent

active

046941746

ABSTRACT:
An apparatus and method for detecting gas concentration using an infrared absorption gas detector. Noise due to vibration is substantially reduced by integrating the voltage produced by the gas detector with an integrator having an adjustable time constant. The time constant is adjusted to a long value during times when the gas concentration is remaining relatively constant. When the gas concentration is changing substantially, the time constant is adjusted to a relatively short value to allow the output of the integrator to better follow the changes.

REFERENCES:
patent: 3916179 (1975-10-01), Cuzzo
patent: 3968370 (1976-07-01), Luft
patent: 4387438 (1983-06-01), Lucich et al.
patent: 4409069 (1983-10-01), Luft
patent: 4467435 (1984-08-01), Warnke et al.
Beckman Instrument Company Catalog No. 4201B, 1980.
Horiba Instruments Co. Instruction Manual for Model PIR-2000 Infrared Gas Detector, Mar., 1982.

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