Non-dispersive infrared gas analyzer
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United States of America Patent
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-
Aug 24, 1982
Grant Date -
N/A
app pub date -
Aug 15, 1980
filing date -
Aug 15, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A non-dispersive infrared gas analyzer is described. Infrared energy is directed through a sample cell, and is interrupted at a predetermined frequency. The infrared energy at at least one preselected wavelength is detected to produce an AC signal having an amplitude proportional to the infrared energy passing through said sample cell and having a frequency corresponding to the predetermined frequency. The preselected wavelength corresponds to the characteristic absorption wavelength of a preselected gas. This AC signal is processed to produce a DC signal having an amplitude proportional to the concentration of the preselected gas in the mixture being analyzed. The signal processor includes an output amplifier, a voltage biasing network including a summing junction connected to the input of the amplifier, and a first variable control manually adjustable to bring the current at the summing junction to zero in the presence of a non-absorbing gas in the sample cell. A second variable control is connected in a feedback loop from the output of the amplifier to the input thereof for span calibration.
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