Sampling and detection of trace gas species by optical spectrosc

Details Sampling and detection of trace gas species by optical spectrosc Sampling and detection of trace gas species by optical spectrosc

1998-03-16

2000-07-11

Soderquist, Arlen

Chemistry: analytical and immunological testing

Testing of catalyst

436 43, 436 52, 436116, 436127, 436133, 436134, 436139, 436141, 436142, 436147, 436148, 436155, 436159, 436171, 436181, 356349, 356432, G01N 2141, G01N 2145, G01B 902

Patent

active

060871814

ABSTRACT:
The present invention discloses a method for improving the speed and sensitivity of optical spectroscopic techniques for remote detection of trace chemical species in a carrier gas. The disclosed method can be applied to any optical spectroscopic detection technique whose sensitivity decreases as the total pressure of the sample decreases. The method employs an inert and non-absorbing buffer gas to supplement the pressure exerted by the carrier gas. This ensures that the total pressure of the sample, and hence sensitivity of the detection technique, remains high. The method is especially useful when measuring concentration of chemical species produced at small rates, and therefore should prove useful for rapid serial screening of combinatorial libraries of compounds.

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