We discuss the possibility of the detection and identification of substances under real conditions. As it is well-known many harmless materials show similar spectral properties to hazardous substances. To identify a matter we are currently developing various time-dependent criteria for the estimation of the probability of a hazardous substance presence in a sample under analysis. A new type of such criteria is discussed in this paper. To explain a physical mechanism for false alarm spectral properties appearance in the signal transmitted through and reflected from a substance we make a computer simulation using 1D Maxwell's equations and density matrix formalism. A feasible approach for highly effective detection and identification of a substance is proposed.
V. A. Trofimov, Svetlana A. Varentsova, Irina G. Zakharova, and Dmitry Yu. Zagursky, "How can we distinguish between simulants and hazardous substances under real conditions?," Proc. SPIE 9995, Optics and Photonics for Counterterrorism, Crime Fighting, and Defence XII, 99950H (Presented at SPIE Security + Defence: September 26, 2016; Published: 24 October 2016); https://doi.org/10.1117/12.2241773.
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