Contaminant identification and concentration determination by mo

Details Contaminant identification and concentration determination by mo Contaminant identification and concentration determination by mo

1998-11-16

2000-06-13

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

25033913, G01N 2186

Patent

active

060752521

ABSTRACT:
A method and apparatus for detecting the presence of a specific concentration of gaseous species within a calibrated range in a gas sample are disclosed. The ILS gas detection system of the present invention simply comprises an ILS laser and an optical detector. However, the spectral bandwidth of the ILS laser is preferably entirely included within one of the absorption bands or regions assigned to the intracavity gaseous species being monitored. Thus, within the calibrated range, the presence of the gaseous species changes the temporal characteristics of the ILS laser. Consequently, only a temporal characteristic of the output of the ILS laser need be monitored in order to quantitatively determine the concentration of the absorbing gaseous species when using the ILS method of the present invention.

REFERENCES:
patent: 5815277 (1998-09-01), Zare et al.

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