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Photoacoustic method for measuring concentration of chemical species

United States Patent

June 12, 2001
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
The present invention is a transducer for photoacoustic detection having at least two piezoelectric elements wherein at least a first piezoelectric element has a first frequency and at least a second piezoelectric element has a second frequency. The improvement according to the present invention is that at least two piezoelectric elements are longitudinal elements for longitudinal waves; and the first frequency is different from said second frequency. In other words, the invention is a multi-frequency longitudinal transducer for photoacoustic detection.
Autrey; S. Thomas (West Richland, WA), Posakony; Gerald J. (Richland, WA), Amonette; James E. (Richland, WA), Foster-Mills; Nancy S. (Richland, WA)
Battelle Memorial Institute (Richland, WA)
09/ 322,910
June 1, 1999
This invention was made with Government support under Contract DE-AC0676RLO1830 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.