We propose also new method for the substance identification by using the THz pulse frequency up-conversion and discuss an application of the cascade mechanism of molecules high energy levels excitation for the substance identification.
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Vyacheslav A. Trofimov, Irina G. Zakharova, Dmitry Yu. Zagursky, Svetlana A. Varentsova, "Detection and identification of substances using noisy THz signal," Proc. SPIE 10194, Micro- and Nanotechnology Sensors, Systems, and Applications IX, 101942O (18 May 2017);