Plasmonic enhanced terahertz time-domain spectroscopy system for identification of common explosives

Abstract

, "Plasmonic enhanced terahertz time-domain spectroscopy system for identification of common explosives," Proc. SPIE ABSTRACTIn this study, we present a classification algorithm for terahertz time-domain spectroscopy systems (THz-TDS) that can be trained to identify most commonly used explosives (C4, HMX, RDX, PETN, TNT, composition-B and blackpowder) and some non-explosive samples (lactose, sucrose, PABA). Our procedure can be used in any THz-TDS system that detects either transmission or reflection spectra at room conditions. After preprocessing the signal in low THz regime (0.1 − 3 THz), our algorithm takes advantages of a latent space transformation based on principle component analysis in order to classify explosives with low false alarm rate.

Interpol review of detection and characterization of explosives and explosives residues 2016-2019

“…Cole, P., Cal, C.J., Jean, D. R., & Fell N. F. Looked at UV Raman spectroscopy to “determine the effect of additional colors of vehicle paints ( besides white, black and bare metal ) with Clearcoat on the ability of UV Raman to detect explosives on these surfaces.” They reported, “The results clearly show a strong luminescent background in all of the visible Raman spectra and only a weak Raman background signal in the case of UV Raman spectra with 150 backscattering at all 3 UV excitation wavelengths and the onset of luminescence between 1,400 and 1,500 cm 1 with 180 backscattering at 257.23-nm excitation” [ 824 ].…”

Recent Developments in Spectroscopic Techniques for the Detection of Explosives

“…Due to the importance of rapid, automatic, and non-contact detection of explosives for homeland security and environmental safety [8], a variety of spectroscopic technologies have been employed to detect trace quantities of explosives; for example, terahertz (THz) spectroscopy [9,10], laser induced breakdown spectroscopy (LIBS) [11,12,13,14,15,16], Raman spectroscopy [17,18,19,20,21,22], ion mobility spectrometry (IMS) [23,24,25,26], nuclear magnetic resonance (NMR) [27,28,29,30], nuclear quadrupole resonance (NQR) [31,32,33], laser-induced thermal emissions (LITE) [34,35], infrared (IR) spectroscopy [36,37,38], mass spectrometry [39,40,41,42,43,44,45,46], optical emission spectroscopy (OES) [47,48], photo-thermal infrared imaging spectroscopy (PT-IRIS) [49,50,51], photoacoustic techniques [52,53,54], FT-FIR spectroscopy [55], microwave [56], and millimeter-wave [57], etc. Various electromagnetic radiations such as X-ray [58] and γ rays [59] have also been employed in explosive detection.…”

New Possibilities of Substance Identification Based on THz Time Domain Spectroscopy Using a Cascade Mechanism of High Energy Level Excitation

“…One of the ways to achieve this aim is by applying THz Time Domain Spectroscopy (TDS) because the THz radiation is non-ionizing and most common substances are transparent to it. Moreover, many hazardous substances have spectral fingerprints in the THz frequency range [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ].…”