Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1983-01-24
1984-08-28
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250343, G01N 2125
Patent
active
044685610
ABSTRACT:
An infrared gas analyzer for measuring at least one component gas of a sample gas mixture. A beam of infrared radiation is periodically interrupted and propagated through a measuring cell through which the sample gas mixture flows. The infrared radiation beam is divided into a reference ray which is propagated through the measuring cell, and a selectivity cell which contains the component gas to be measured; and a measuring ray which is propagated through the measuring cell, and a gas-filled compensation cell. In one embodiment, the compensation cell and the measuring cell are serially coupled to one another so that the sample gas mixture flows through both. Alternatively, the compensation and measuring cells may be connected in parallel with respect to one another. Selective detectors are provided for producing an output signal responsive to the difference between the attenuation of the measuring ray and the attenuation of the reference ray, as they are propagated through their respective paths. This output signal corresponds to the concentration of the components gas in the sample gas mixture. The compensation and selectivity cells may be combined in an interchangeable housing block.
REFERENCES:
patent: 2668243 (1954-02-01), Williams
patent: 2758216 (1956-08-01), Luft
patent: 4157470 (1979-06-01), Kotaka et al.
patent: 4180732 (1979-12-01), Fabinski et al.
Fields Carolyn E.
Siemens Aktiengesellschaft
Smith Alfred E.
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