Infrared gas analyzer

Details Infrared gas analyzer Infrared gas analyzer

G - Physics

01

N

345/14, 73/57

G01N 21/01 (2006.01) G01N 21/35 (2006.01)

Patent

CA 1079999

ABSTRACT OF THE DISCLOSURE An infrared gas analyser capable of eliminating the effects of an interference component in a sample gas and reducing errors resulting from ambient temperature fluctuation is disclosed. The analyser includes a sample cell filled with sample gas, a first filter which transmits infrared rays of a fixed band included within the absorption wavelength band of a measurement component. A temperature compensating cell encloses a gas which has part of its absorption band within the transmission band of the first filter and different in spectrum from the measurement component. Also pro- vided are an interference cell enclosing a gas containing a measurement component of fixed density and an interference compensating cell filled with the sample gas. A second filter transmits infrared in a band which includes the major path of the transmission band of the first filter. Two light paths from an infrared source to a detector are formed, one through the temperature compensation cell the sample cell and the first filter and the other through the interference cell, interference compensating cell and the second filter. Each path carries half the total light.

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