Method for remote monitoring of gaseous products

Details Method for remote monitoring of gaseous products Method for remote monitoring of gaseous products

1974-12-31

1976-08-24

Church, Craig E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356 97, G01M 2126

Patent

active

039768848

ABSTRACT:
A method for remotely monitoring the concentration of a particular gas species in a gaseous mixture. The remote detection of pollutants emitted in source effluents, e.g., gas from a smokestack, involves specific spectral measurements of infrared radiation and, in this method, includes ratioing the signals from two gas-reference cell pairs to eliminate dependencies upon the inlowering atmosphere and source effluent temperature. An instrument cell construction and assembly using a unique cells-within-a cell permits use of a single lens that insures common fields-of-view for both cell pairs; a triple chopping system uses tuning forks to alternately pass the incoming energy through the gas and reference cells eliminating the need for separate sync signal generators, and provides a high carrier frequency improving the signal-to-noise ratio of the sensor.

REFERENCES:
patent: 3558229 (1971-01-01), Karle
patent: 3598994 (1971-08-01), Markle

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