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Acoustic resonance phase locked photoacoustic spectrometer

United States Patent

August 19, 2003
View the Complete Patent at the US Patent & Trademark Office
A photoacoustic spectroscopy method and apparatus for maintaining an acoustic source frequency on a sample cell resonance frequency comprising: providing an acoustic source to the sample cell to generate a photoacoustic signal, the acoustic source having a source frequency; continuously measuring detection phase of the photoacoustic signal with respect to source frequency or a harmonic thereof; and employing the measured detection phase to provide magnitude and direction for correcting the source frequency to the resonance frequency.
Pilgrim; Jeffrey S. (Santa Fe, NM), Bomse; David S. (Santa Fe, NM), Silver; Joel A. (Santa Fe, NM)
Southwest Sciences Incorporated (Santa Fe, NM)
09/ 782,137
February 12, 2001
GOVERNMENT RIGHTS The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DE-FG03-99ER82887 awarded by the U.S. Department of Energy.