Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1981-08-24
1983-08-09
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
G01N 2126
Patent
active
043980910
ABSTRACT:
An infrared gas analyzer is described wherein infrared energy is directed from a suitable source through a sample cell, the infrared energy being interrupted at a predetermined frequency. Infrared energy of a preselected wavelength causes a detector for each monitored gas to produce a signal proportional to the infrared energy passing through the sample cell and having a frequency corresponding to the predetermined frequency. Each preselected wavelength corresponds to the characteristic absorption wavelength of a preselected gas. A signal processor for the analyzer includes a preamplifier adapted to compensate for temperature variations in the detector while an output amplifier is adapted to compensate for temperature variations in the sample cell in order to provide a more accurate output signal.
REFERENCES:
patent: 3790797 (1974-02-01), Sternberg et al.
patent: 4013260 (1977-03-01), McClatchie et al.
patent: 4153837 (1979-05-01), Ross
patent: 4346296 (1982-08-01), Passaro et al.
Andros Analyzers Incorporated
Howell Janice A.
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