Selectivity enhancement in photoacoustic gas analysis via...

Details Selectivity enhancement in photoacoustic gas analysis via... Selectivity enhancement in photoacoustic gas analysis via...

2005-02-09

2010-10-05

Williams, Hezron (Department: 2856)

Measuring and testing

Gas analysis

By vibration

Reexamination Certificate

active

07805980

ABSTRACT:
A method for detecting a target fluid in a fluid sample comprising a first fluid and the target fluid using photoacoustic spectroscopy (PAS), comprises a) providing a light source configured to introduce an optical signal having at least one wavelength into the fluid sample; b) modulating the optical signal at a desired modulation frequency such that the optical signal generates an acoustic signal in the fluid sample; c) measuring the acoustic signal in a resonant acoustic detector; and d) using the phase of the acoustic signal to detect the presence of the target fluid.

REFERENCES:
patent: 4738536 (1988-04-01), Kitamori et al.
patent: 5159411 (1992-10-01), Hammerich et al.
patent: 6608683 (2003-08-01), Pilgrim et al.
A. A. Kosterev, et al.; Photoacoustic Phase Shift as a Chemically Selective Spectroscopic Parameter; Applied Physics B; 2004; vol. 78, pp. 673-676; Rice University USA.
International Search Report for PCT/US05/004125 dated Jun. 2, 2006.

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