Photoacoustic microcantilevers
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United States of America Patent
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Jun 5, 2012
Grant Date -
Feb 11, 2010
app pub date -
Jun 19, 2009
filing date -
Aug 11, 2008
priority date (Note) -
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Abstract
A system generates a photoacoustic spectrum in an open or closed environment with reduced noise. A source focuses a beam on a target substance disposed on a base. The base supports a cantilever that measures acoustic waves generated as light is absorbed by the target substance. By focusing a chopped/pulsed light beam on the target substance, a range of optical absorbance may be measured as the wavelength of light changes. An identifying spectrum of the target may detected by monitoring the vibration intensity variation of the cantilever as a function of illuminating wavelength or color.
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