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.
Type:
Grant
Filed:
June 19, 2009
Date of Patent:
June 5, 2012
Assignee:
UT-Battellle, LLC
Inventors:
Thomas G. Thundat, Charles W. Van Neste, Gilbert M. Brown, Lawrence R. Senesac