Highly sensitive standoff detection and identification of traces of explosives and of biological and chemical agents

Alexander Portnov, Ilana Bar, Salman Rosenwaks

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Our experiments focused on monitoring the signal obtained from diffuse reflections of forward-generated coherent anti- Stokes Raman scattering (CARS), occurring in different samples, referred to as "backward-CARS" (B-CARS). The methodology of B-CARS was developed and the feasibility of using it as a spectroscopic tool for standoff detection of particles of explosives and related compounds studied. Signals of both the B-CARS and spontaneous Raman scattering under similar conditions were monitored to compare their sensitivities. In addition, the dependence of the B-CARS signal on the distance was measured at short ranges and the standoff detection capabilities of the method at long distances estimated. The measurements imply that B-CARS allows favorable detection as compared to Raman. However, an inherent drawback of the developed narrowband B-CARS method is the need to scan the Stokes beam frequency to monitor the different vibrational levels of the detected species. We therefore embarked on a broadband B-CARS method (patent pending) which is based on the application of a sub-ns ultra-broadband laser source for the Stokes beam and enables to monitor simultaneously a wide span of vibrational transitions of the detected species.

Original languageEnglish
Title of host publicationOptics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII
DOIs
StatePublished - 13 Dec 2010
EventOptics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII - Toulouse, France
Duration: 20 Sep 201023 Sep 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7838
ISSN (Print)0277-786X

Conference

ConferenceOptics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII
Country/TerritoryFrance
CityToulouse
Period20/09/1023/09/10

Keywords

  • Backward-CARS
  • CARS
  • Explosives
  • Raman
  • Standoff detection

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