Gas species monitor system

Details Gas species monitor system Gas species monitor system

1989-03-20

1990-09-04

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With raman type light scattering

G01J 344, G01N 2165

Patent

active

049539760

ABSTRACT:
A gas species monitor system includes a sample volume for receiving a gas to be monitored; an external, independent laser source; means for directing the laser radiation to the volume; a multipass optical cell, responsive to the means for directing, for multiplying the laser radiation intensity in the sample volume; means for continuously flowing the gas to be monitored through the sample volume; a narrow bandpass filter; means for collecting more than a steradian of Raman scattered radiation from the sample in the volume and directing the collected radiation in parallel through the narrow bandpass filter; and means responsive to the parallel radiation from the filter for detecting the Raman scattered radiation representative of the concentration of the species in the gas sample being monitored.

REFERENCES:
patent: 3802777 (1974-04-01), Regnier et al.
patent: 3906241 (1975-09-01), Thompson
patent: 4127329 (1978-11-01), Chang et al.
patent: 4630923 (1986-12-01), Tans et al.
patent: 4648714 (1987-03-01), Benner et al.
patent: 4784486 (1988-11-01), Van Klagenen et al.

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