G - Physics – 01 – N
Patent
G - Physics
01
N
73/57
G01N 21/01 (2006.01) G01M 15/10 (2006.01) G01N 21/35 (2006.01)
Patent
CA 1045847
ABSTRACT OF THE DISCLOSURE The invention relates to a gas analysis system for measuring the amount of a selected contaminant contained within a sample gas. The system includes a gas sample cell which contains the gas and a reference cell containing a reference gas. The sample cell gas can be filled with ambient air. The system also includes a moving beam infrared energy generator to pass the beam alternately through the reference cell and the sample cell. A detector is positioned to receive the energy beam after it has passed through the cells, and the detector includes a filter which transmits only a selected narrow wave band within the spectrum of the infrared energy beam. The detector produces first and second electrical signals indicative respectively of the absorption of the infrared beam within the reference and sample cells when the sample cell contains ambient air. The gas sample cell is filled with a sample gas and the moving beam is then alternated between the sample cell, when it is filled with the sample gas, and the reference cell, whereupon the detector produces third and fourth electrical signals indicative respectively of the absorption of the infrared beam within the reference and sample cells. A signal processing unit receives the first, second, third and fourth signals and produces there- from an output signal proportional to the concentration of the selected contaminant in the sample gas. This application is related to Application Serial No. 241,301 having the same applicant as the applicant herein.
241288
Cross Thomas A.
Jowett Terence W.
Knights Anthony D.m.
Rabinowitz Charles M.
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