Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1983-06-17
1985-12-24
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250343, 250351, 356439, G01N 2135
Patent
active
045608733
ABSTRACT:
Apparatus is disclosed to accurately measure and analyze multiple component interfering gases which coexist in the stack gas effluent generated from a combustion process which utilizes a non-dispersive, narrowband infrared absorption technique. The apparatus includes a probe in the stack with an optical measurement cavity (34) through which the stack gases are passed. A transceiver (14) mounted to the probe includes an optical portion operatively associated with the measurement cavity including a chopped light source (54), (60), (62) for projecting beams of light into the measurement cavity and a detector (86) for detecting the attenuation of the gases to provide a measure of the extent of absorption of each gas of interest. A control unit, preferably remote from the transceiver, preferably a programmed digital computer, and preferably via a J-box (18) converts the electric outputs to a corresponding % modulation and in turn corrects for temperature, pressure and interference between gases. The results may be displayed on a front panel (174) or used, for example, to maximize efficiency in a combustion process.
REFERENCES:
patent: 3796887 (1974-03-01), Vincent et al.
patent: 4013260 (1977-03-01), McClatchie et al.
patent: 4153837 (1979-05-01), Ross
patent: 4323777 (1982-04-01), Baskins et al.
patent: 4480191 (1984-10-01), Karpowycz
W. B. Telfair, A. C. Gilby, R. J. Syrjala and P. A. Wilks, Jr., "A Microcomputer-Controlled Infrared Analyzer for Multi-Component Analysis", American Laboratory, vol. 8, No. 11 (Nov. 1976) pp. 91-100.
Ketchum Ronald L.
McGowan Gerald F.
Polhemus Carl E.
Price Gerald W.
Hannaher Constantine
Lear Siegler, Inc.
Smith Alfred E.
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