Highly sensitive standoff detection and identification of traces of explosives and of biological and chemical agents Academic Article uri icon


  • 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 …

publication date

  • October 12, 2010