Patent ID: 7265842
Filing Date: 2007-09-04
Classification: G01N

Abstract:
1. A process for detecting a gaseous target analyte present as a minor constituent in an admixture with at least one other gaseous species using a cavity enhanced optical spectrometer comprising the steps of: i) identifying a plurality of strong spectral absorption peaks of said target analyte which are present within the scanning range of said spectrometer; ii) determining for said identified peaks the pressure region above which the peak width increases substantially with increasing pressure and below which the peak width is substantially independent of pressure; iii) determining which of the peaks identified in step i) are, within the pressure region determined in step ii), free from spectral interference by any of the other components of said admixture; iv) measuring the spectrum of said admixture at the pressure region identified in step ii); v) providing said measured spectrum as an output.