Gas analysers of the selective radiation absorption type with a

Details Gas analysers of the selective radiation absorption type with a Gas analysers of the selective radiation absorption type with a

1978-06-16

1980-05-27

McGraw, Vincent P.

Optics: measuring and testing

Standard

356439, 250343, G01J 102, G01N 2100

Patent

active

042047684

ABSTRACT:
A gas analyser of the infra-red radiation absorption type, particularly for measuring the amounts of CO.sub.2 and CO in vehicle exhaust gases, comprises a pair of infra-red radiation sources arranged to direct their radiation along a measurement path and a reference path respectively, the radiation entering each path being periodically interrupted by a rotating commutator. Two measurement chambers for receiving the gas to be analysed and respective detection chambers for CO.sub.2 and CO are alternately disposed along the measurement path, while two reference chambers and two more such detection chambers are alternately disposed along the reference path, corresponding detection chambers being connected to respective differential pressure sensors of the variable capacitance type. The analyser includes a calibration cell containing predetermined concentrations of CO.sub.2 and CO. The cell is selectively interposable in the measurement path, and is connected to a flexible-wall chamber. The flexible-wall chamber defines with the cell a sealed enclosure, and serves to maintain the pressure within the sealed enclosure equal to ambient pressure.

REFERENCES:
patent: 3562522 (1971-02-01), Cederstrand et al.
patent: 3728540 (1973-04-01), Todd et al.
patent: 3898462 (1975-08-01), Ishida et al.
patent: 3980517 (1976-09-01), MacTaggart

Affiliated with

Also associated with

Rating

Gas analysers of the selective radiation absorption type with a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Gas analysers of the selective radiation absorption type with a , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas analysers of the selective radiation absorption type with a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1117077