Photoacoustic point spectroscopy
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United States of America Patent
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Jun 14, 2011
Grant Date -
Feb 11, 2010
app pub date -
Aug 11, 2008
filing date -
Aug 11, 2008
priority date (Note) -
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Abstract
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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