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Title: Reverse photoacoustic standoff spectroscopy

Abstract

A system and method are disclosed for generating a reversed photoacoustic spectrum at a greater distance. A source may emit a beam to a target and a detector measures signals generated as a result of the beam being emitted on the target. By emitting a chopped/pulsed light beam to the target, it may be possible to determine the target's optical absorbance by monitoring the intensity of light collected at the detector at different wavelengths. As the wavelength of light is changed, the target may absorb or reject each optical frequency. Rejection may increase the intensity at the sensing element and absorption may decrease 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.

Inventors:
 [1];  [2];  [2]
  1. Kingston, TN
  2. Knoxville, TN
Issue Date:
Research Org.:
UT-Battelle LLC/ORNL, Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1016723
Patent Number(s):
7924423
Application Number:
US Patent Application 12/189,663
Assignee:
UT-Battelle, LLC (Oak Ridge, TN)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Van Neste, Charles W, Senesac, Lawrence R, and Thundat, Thomas G. Reverse photoacoustic standoff spectroscopy. United States: N. p., 2011. Web.
Van Neste, Charles W, Senesac, Lawrence R, & Thundat, Thomas G. Reverse photoacoustic standoff spectroscopy. United States.
Van Neste, Charles W, Senesac, Lawrence R, and Thundat, Thomas G. Tue . "Reverse photoacoustic standoff spectroscopy". United States. https://www.osti.gov/servlets/purl/1016723.
@article{osti_1016723,
title = {Reverse photoacoustic standoff spectroscopy},
author = {Van Neste, Charles W and Senesac, Lawrence R and Thundat, Thomas G},
abstractNote = {A system and method are disclosed for generating a reversed photoacoustic spectrum at a greater distance. A source may emit a beam to a target and a detector measures signals generated as a result of the beam being emitted on the target. By emitting a chopped/pulsed light beam to the target, it may be possible to determine the target's optical absorbance by monitoring the intensity of light collected at the detector at different wavelengths. As the wavelength of light is changed, the target may absorb or reject each optical frequency. Rejection may increase the intensity at the sensing element and absorption may decrease 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {4}
}

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