Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1978-02-16
1979-05-08
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250346, G01N 2126
Patent
active
041538374
ABSTRACT:
An optical gas-concentration analyzer which utilizes the infrared absorption principle has a sample chamber and reference chamber with infrared source and detector assemblies spaced at opposite ends of an in alignment with the chambers. An electronic processing system utilizes a spectral-absorption electrical signal from the detector assembly to derive the desired gas-concentration measurement for readout from a display device. Barometric correction means is provided to permit on site calibration by the user of the gas analyzer via an atmospheric pressure calibration indication obtained on the display device by switching the apparatus to a calibrating mode. Apparatus for compensating for broadening of the spectral line of a gas the concentration of which is to be measured by another gas in the sample and for the temperature of the sample gas is also provided.
REFERENCES:
patent: 3206597 (1965-09-01), Fertig et al.
patent: 3700891 (1972-10-01), Luft
Anarad Inc.
Evans W. R.
Skolnik R. M.
Willis Davis L.
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