The presentation is devoted to general analysis of the feasibility to use various effects of laser radiation interaction with the matter to detect traces of the explosives vapours in the atmosphere. Some problems in developing practical laser-based detectors are also discussed. Analysis presented gives information on the expected levels of vapours concentration in the atmosphere for the most common explosives and suggests possible scenario of their detection. Comparison is made in the presentation of the main optical effects regarding the efficiency of interaction between the matter and radiation and potentialities of the laser-based detection methods are being assessed. A possibility is analyzed of using for this purpose the fluorescence and resonance Raman scattering at excitation in deep UV region. To improve the selectivity of the detection it is proposed to make use of the spectroscopic approach based on the method of time-resolved excitation–emission matrices. This approach is capable of improving the detection selectivity by use of four-dimensional spectroscopic images of the objects surveyed. The way of realizing a detection system based on this approach is proposed that assumes development of a multichannel spectrum analyzer possessing high time resolution. As an example some preliminary results are presented on detecting minor molecular species in the atmosphere with a 32-spectral channel lidar. Some key research tasks are formulated in the presentation that are to be addressed in developing laser systems for detection of the explosives traces in the atmosphere.
Time-Resolved Excitation–Emission Matrices Spectroscopic Approach to Explosives Detection
01.01.2006
19 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Time-Resolved Excitation-Emission Matrices Spectroscopic Approach to Explosives Detection
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