About possibility of eliminating the influence of water vapour on the detection and identification of substance at using the THz laser pulse

Vyacheslav A. Trofimov; Nikolay V. Peskov

doi:10.1117/12.893084

16 September 2011 About possibility of eliminating the influence of water vapour on the detection and identification of substance at using the THz laser pulse

Vyacheslav A. Trofimov, Nikolay V. Peskov

Author Affiliations +

Proceedings Volume 8119, Terahertz Emitters, Receivers, and Applications II; 81190J (2011) https://doi.org/10.1117/12.893084
Event: SPIE Photonic Devices + Applications, 2011, San Diego, California, United States

Abstract

One of the modern problems arising in the detection and identification of substances is an influence of water vapour on the THz signal reflected from sample. The vapour of water distorts the signal and its spectrum. Hence, we get the signal, which contains information about water. We propose one of the possible approaches to avoid this influence on the detection and identification of substance. This approach concludes in full elimination of spectral lines corresponding to spectral lines of water absorption from the spectrum of the signal. Then we reconstruct the signal with obtained spectrum and make the spectral dynamics analysis for the identification of substance. The efficiency of our approach is demonstrated by its application for the THz signal reflected from explosive. It is essential that we analyze the THz pulse with a few cycles. As consequence, this pulse has broad spectrum. To prove the validity of our approach we make theoretical analysis of dependence of spectral dynamics at chosen frequency on neighbor frequencies. We show that only the medium response on some frequencies influences on spectral dynamics of chosen frequency. Hence, to analyze the substance response on chosen frequencies the necessity of analyzation of full spectrum is absent. It is very important step for real application of method of the spectral dynamics analysis (SDA-method) for the detection and identification of explosive.

Citation Download Citation

Vyacheslav A. Trofimov and Nikolay V. Peskov "About possibility of eliminating the influence of water vapour on the detection and identification of substance at using the THz laser pulse", Proc. SPIE 8119, Terahertz Emitters, Receivers, and Applications II, 81190J (16 September 2011); https://doi.org/10.1117/12.893084

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