Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1974-03-27
1976-01-13
Church, Craig E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
G01N 2126
Patent
active
039327540
ABSTRACT:
A multiple gas analyzer is disclosed utilizing the infrared absorption principle for determining the quantity of two or more gases with a sample tube and a reference tube in parallel orientation with an infrared source between one end of the two tubes, and an infrared detector assembly between the other end of the tubes. Immediately opposed to each end of the tubes are a pair of mirrors, one being a transmitting mirror remote from the infrared source and directing the infrared beam in parallel paths through the reference tube and sample tube, and a receiving mirror opposite the infrared detector assembly to focus the infrared beam after passing through the tubes on to the infrared detectors. A chopper disc is interposed between the infrared source and the transmitting mirror to provide intermittently direct pulses to the infrared beam through the reference tube and sample tube to the infrared detectors, and a circuit is provided to compare the differential of signal strength from the two signals generated by each of the detectors and to calibrate the same with regard to the gas content being read. Filters are provided in the infrared detector assembly for that particular wave length in which the gas finds its signature for photon absorption. In the circuit, provision is made to first calibrate the unit for ambient variables, and thereafter to calibrate the unit against a factory determined span gas sample by means of vignetting the sample chamber to simulate a convenient up-scale reading of the particular gas being calibrated. Further adjustment is provided for comparing the high scale with the low scale in the course of sampling to thereby fully calibrate the unit and check the same during its operation.
REFERENCES:
patent: 2547212 (1951-04-01), Jamison
patent: 3562524 (1971-02-01), Moore
patent: 3649833 (1972-03-01), Leaf
patent: 3677652 (1972-07-01), Little
patent: 3696247 (1972-10-01), McIntosh
Riedl Max J.
Ross Thaddeus C.
Church Craig E.
Infrared Industries, Inc.
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