Apparatus for non-dispersive infrared analyzer

Details Apparatus for non-dispersive infrared analyzer Apparatus for non-dispersive infrared analyzer

1996-05-15

1997-10-14

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

G01N 2161

Patent

active

056775342

ABSTRACT:
An infrared light beam, emitted from an infrared light source 4, arrives periodically and alternatively at a sample cell 1a and reference cell 1b through a rotating chopper 2. The beam, which travels through the sample cell 1a and reference cell 1b, is detected as a sample signal and reference signal by a detector 5. The chopper 2 has apertures 2a and 2a. Since the aperture 2a, which faces the sample cell 1a, and the aperture 2b, which faces the reference cell 1b, are each formed in an arc shape having a central angle of about 90 degrees, the amount of time for which the infrared light beam is emitted and not emitted to the sample cell 1b and the reference cell 1a are all about equal. Therefore, the non-dispersive infrared analyzer can obtain about twice the amount of information about the concentration of the gas to be measured than a conventional apparatus per one chopper rotation.

REFERENCES:
patent: 2555327 (1951-06-01), Elliott
patent: 3454760 (1969-07-01), Kowert et al.
patent: 4008394 (1977-02-01), Risgin et al.

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