Method and apparatus for gas analysis

Details Method and apparatus for gas analysis Method and apparatus for gas analysis

1978-06-19

1979-08-07

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

G01J 100

Patent

active

041638999

ABSTRACT:
A method and apparatus are described for detecting a selected gas in an unknown gas sample. The power output of a radiant energy source is modulated at a first frequency and passed through the sample, the density of the sample being varied at a second frequency. The radiant energy passing through the sample is detected by and converted to an electrical signal which is then processed in order to produce an output signal representative of the selected gas. Density of the sample is preferably modulated or varied periodically by means of a pulsating pump which also supplies the unknown gas.

REFERENCES:
patent: 2758216 (1956-08-01), Luft
patent: 3005097 (1961-10-01), Hummel
patent: 3679899 (1972-07-01), Dimeff
patent: 4027972 (1977-06-01), Davies

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