Optical absorption spectroscopy based gas analyzer systems and methods
OwnerSerguei Koulikovinventor
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Abstract
The present invention provides a system for measuring concentrations of trace gases in gas mixtures using an absorption spectroscopy method. The system comprising: a resonant optical cavity containing a gas mixture, a continuous-wave external cavity laser, a detector system for measuring an absorption of laser light by the gas in the resonant optical cavity, wherein the ratio of the round-trip length of the external cavity laser to the round-trip length of the resonant optical cavity or its inverse value is between N−0.2 and N+0.2, where N is a positive integer number.
Claims20
A gas analyzer system for measuring a concentration of an analyte in a gaseous medium, the system comprising:
- a continuous-wave external cavity laser, wherein the external cavity laser comprises a laser cavity having a round trip light path;
- a gain medium;
- and a spectral filter positioned within the laser cavity;
- a resonant optical cavity containing said gaseous medium and having at least two cavity mirrors, wherein the resonant optical cavity defines a round trip light path of the resonant optical cavity;
- a first acoustic sensor positioned within said resonant optical cavity for measuring a photoacoustic signal caused by absorption of the laser light by said gaseous medium and configured to produce a data signal;
- wherein the spectral filter is said resonant optical cavity, and the ratio of the round trip light path length of the external cavity laser to the round trip light path length of the resonant optical cavity or its inverse value is between N−0.2 and N+0.2, where N is a positive integer number.
Dependencies are inferred from the claim text.