Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1990-06-21
1991-11-05
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250345, 356433, 356434, 356435, 356437, G01N 2161
Patent
active
050632752
ABSTRACT:
There is provided a gas analyzer, including a radiation source, an analytical space through which passes the gas to be analyzed, at least one detector for detecting the intensity of radiation passing through the space, apparatus for facilitating the alternating introduction, into the space, of the gas to be analyzed and a reference gas having a concentration located at least in the upper half of the range of concentrations to be measured by the gas analyzer. The analyzer further includes processing apparatus, having a memory device, to process signals originating in the detector, the memory device adapted to store in a first mode of operation, signals representing instantaneous intensity values of the detected source and, in a second mode of operation, to store signals representing intensity values obtained when the analytical space is filled with the reference gas, a circuit for comparing the instantaneous values with the reference value, and an indicator device for indicating concentration. A method for analyzing gases to establish their concentration is also provided.
REFERENCES:
patent: 4346296 (1982-08-01), Passaro et al.
patent: 4355234 (1982-10-01), Fertig et al.
patent: 4755675 (1988-07-01), Rosenfeld et al.
patent: 4780613 (1988-10-01), Berstein et al.
D. W. Hill and T. Powell, "Non-Dispersive Infra-Red Gas Analysis in Science, Medicine and Industry." (Plenum Press, New York, 1968), pp. 30-33, 42-55.
Coleman Lewis
Rosenfeld Elieser Z.
Hannaher Constantine
Spegas Industries Ltd.
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