Photoacoustic point spectroscopy

Van Neste, Charles W; Senesac, Lawrence R; Thundat, Thomas G

Title: Photoacoustic point spectroscopy

Patent · Tue Jun 14 00:00:00 EDT 2011

OSTI ID:1019093

Van Neste, Charles W ^[1]; Senesac, Lawrence R ^[2]; Thundat, Thomas G ^[2]

Kingston, TN
Knoxville, TN

A system and method are disclosed for generating a photoacoustic spectrum in an open or closed environment with reduced noise. A source may emit a beam to a target substance coated on a detector that measures acoustic waves generated as a result of a light beam being absorbed by the target substance. By emitting a chopped/pulsed light beam to the target substance on the detector, it may be possible to determine the target's optical absorbance as the wavelength of light is changed. Rejection may decrease the intensity of the acoustic waves on the detector while absorption may increase the intensity. Accordingly, an identifying spectrum of the target may be made with the intensity variation of the detector as a function of illuminating wavelength.

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Research Organization:: UT-Battelle LLC/ORNL, Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

Assignee:: UT-Battelle, LLC (Oak Ridge, TN)

Patent Number(s):: 7,961,313

Application Number:: US Patent Application 12/189,652

OSTI ID:: 1019093

Country of Publication:: United States

Language:: English

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