Terahertz spectroscopic investigations of explosives

A synthetic approach to weathering degree classification of stone relics case study of the Yungang Grottoes

“…The spectral data of the weathered samples were collected by transient THz-TDS [24]. A titanium sapphire femtosecond pulsed laser was used to generate laser light sources with a 800-nm central wavelength, 80-MHz repetition frequency, 100-fs pulse width, and 960-mW power output.…”

Terahertz Emitters, Detectors and Sensors: Current Status and Future Prospects

“…The samples are identified by their absorption peaks extracted from the negative first-order derivative of the sample signal phase divided by the frequency at each pixel. Hu etal [ Hu et al, 2006] report experimental measurement and theoretical analysis of THz spectrum for five different explosives and related compounds are introduced. The refractive index and absorption coefficient of the samples are measured in the region of 0.2-2.6 terahertz by time-domain spectroscopy.…”

Identification of Explosives 2,4‐DNT and 2,6‐DNT Using Terahertz Time‐domain Spectroscopy

“…Up to date, several explosives and related compounds (ERC) have been studied utilizing THz-TDS. [1][2][3][4] 2,4-DNT and 2,6-DNT are two of the six isomeric forms of the explosive compounds called dinitrotoluene (DNT). DNT is one of the main explosives used in the production of landmines and is a product of degradation and an impurity in the synthesis of 2,4,6-trinitrotoluene (TNT).…”

“…5,6 THz spectra of solid 2,4-DNT were studied using THz-TDS by many researchers. 4,7,8 For some reasons, absorption peaks at 0.44 and 0.65 THz were not pecked. In addition, THz spectrum of gas-phase 2,4-DNT was first measured utilizing pulsed THz-TDS from 0.05 to 2.7 THz due to the challenges to THz-TDS measurements on vaporphase explosives, namely the intrinsically low vapor pressures of explosives, the stringent heating requirements, and the unknown THz absorption cross-sections for these materials.…”