How can we distinguish between simulants and hazardous substances under real conditions?

Trofimov, Vyacheslav A.; Varentsova, Svetlana A.; Zakharova, Irina G.; Zagursky, Dmitry Yu.

doi:10.1117/12.2241773

Cited by 2 publications

(1 citation statement)

References 30 publications

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“…The essential limitations of the standard THz-TDS method for substance detection and identification were also demonstrated. In [ 42 ] a computer simulation of a THz pulse interaction with disordered layered structures was made and the occurrence of false absorption frequencies in the spectrum of the signal transmitted through or reflected from such structure was explained.…”

Section: Introductionmentioning

confidence: 99%

The Anomalous Influence of Spectral Resolution on Pulsed THz Time Domain Spectroscopy under Real Conditions

Trofimov¹,

Varentsova²

2017

Sensors

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We have studied the spectral resolution influence on the accuracy of the substance detection and identification at using a broadband THz pulse measured under real conditions (at a distance of more than 3 m from a THz emitter in ambient air with a relative humidity of about 50%). We show that increasing spectral resolution leads to manifestation of small-scale perturbations (random fluctuations) in the signal spectrum caused by the influence of the environment or the sample structure. Decreasing the spectral resolution allows us to exclude from consideration this small-scale modulation of the signal as well as to detect the water vapor absorption frequencies. This fact is important in practice because it allows us to increase the signal processing rate. In order to increase the detection reliability, it is advisable to decrease the spectral resolution up to values of not more than 40% of the corresponding spectral line bandwidth. The method of spectral dynamics analysis together with the integral correlation criteria is used for the substance detection and identification. Neutral substances such as chocolate and cookies are used as the samples in the physical experiment.

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Section: Introductionmentioning

confidence: 99%