Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1977-01-28
1978-08-29
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
G01N 2126
Patent
active
041106199
ABSTRACT:
The photometer comprises a light source, a reference cuvette containing a reference gas, a measurement cuvette containing a gas component whose concentration is to be measured accompanied by a carrier gas, a light modulator for effecting antiphase modulation of the infrared light passing through the two cuvettes, and a detector arrangement comprised of two gas-filled absorption chambers arranged one behind the other as well as a transducer for converting pressure changes induced in the absorption chambers into a measurement signal. The carrier gas consists of a plurality of component gases whose relative proportions fluctuate. The gas in the absorption chambers includes a gas component identical to the gas whose concentration is to be measured in the measurement cuvette, accompanied by an inert gas. The concentration of the infrared-active gas in the absorption chambers is repeatedly adjusted, until the measurement signal is made substantially independent of fluctuations in the relative proportions of the carrier-gas components.
REFERENCES:
patent: 3898462 (1975-08-01), Ishida et al.
patent: 3968370 (1976-07-01), Luft
H. Maihak AG
Striker Michael J.
Willis Davis L.
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