Detection of covered materials in the TDS-THz setup

Pałka, Norbert

doi:10.1117/12.2015373

Cited by 5 publications

(6 citation statements)

References 12 publications

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“…Here P(ν), P REF (ν) are spectral amplitudes of the main pulses of the signal RDX_08 and its Reference, correspondingly. Reflectance (b) demonstrates pronounced minima at frequencies ν=0.96, 1.53, 2.47 THz, which are in a good agreement with [10]. But in [25,26] we showed that the inhomogeneous surface or some opaque cover can significantly distort the spectral properties of the main pulse, after that the identification becomes very difficult.…”

Section: Reflected Rdx Signalsupporting

confidence: 73%

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Effective criteria developing for the identification of substance using the reflected THz signal

Trofimov

Varentsova

2014

SPIE Proceedings

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We propose and discuss modified correlation criteria for the detection and identification of dangerous substances using pulsed THz signal in the reflection mode. These criteria are integral criteria in time and they are based on the SDA method. We develop various approaches for enhancement of features of a detecting substance in reflected THz signal under investigation. These criteria are applied for the detection of different explosive situations. Among them we consider a mixture of explosives and PWM C4 explosive with very complicated surface. Proposed algorithms show both high probability of the substance identification and a reliability of realization in practice. We discuss modified correlation criteria for the detection and identification of dangerous substances using pulsed THz signal in the reflection mode.Keywords: reflected THz pulse, method of spectral dynamics analysis, detection and identification of substances, modified integral correlation criterion. *vatro@cs.msu.ru; phone 7 495 939-5255; fax 7 495 939-2597

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Section: Reflected Rdx Signalsupporting

confidence: 73%

“…Nowadays the THz Time-Domain Spectroscopy is a widely used technology for the problems of defense and security [1][2][3][4][5][6][7][8][9][10][11][12]. THz-TDS technology is based on the analysis of the absorption or reflection spectra of THz radiation, transmitted through or reflected from the medium.…”

Section: Introductionmentioning

confidence: 99%

Effective criteria developing for the identification of substance using the reflected THz signal

Trofimov

Varentsova

2014

SPIE Proceedings

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“…), surface roughness of the samples, and water vapor or humidity present in the air [30,37]. Many researchers have addressed these challenges through developing methods to separate spectral fingerprints of explosives from barrier materials [30,31,[38][39][40], and signal-processing algorithms to compensate for water-vapor absorption [32].…”

Section: Terahertz Spectroscopy and Imagingmentioning

confidence: 99%

Advances in explosives analysis—part II: photon and neutron methods

et al. 2015

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The number and capability of explosives detection and analysis methods have increased dramatically since publication of the Analytical and Bioanalytical Chemistry special issue devoted to Explosives Analysis [Moore DS, Goodpaster JV, Anal Bioanal Chem 395:245-246, 2009]. Here we review and critically evaluate the latest (the past five years) important advances in explosives detection, with details of the improvements over previous methods, and suggest possible avenues towards further advances in, e.g., stand-off distance, detection limit, selectivity, and penetration through camouflage or packaging. The review consists of two parts. Part I discussed methods based on animals, chemicals (including colorimetry, molecularly imprinted polymers, electrochemistry, and immunochemistry), ions (both ion-mobility spectrometry and mass spectrometry), and mechanical devices. This part, Part II, will review methods based on photons, from very energetic photons including X-rays and gamma rays down to the terahertz range, and neutrons.

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“…Therefore, the p-spectrum method for extraction of the characteristic features of these materials was proposed * e-mail: npalka@wat.edu.pl previously [11]. Briey, the method takes into account only part of the pulse reected from a sample, which is next analyzed in the frequency domain by the Fourier transform.…”

Section: Introductionmentioning

confidence: 99%

“…A spectrum characteristic of the TDS pulse decreases with frequency and limits the application of the method to the frequencies up to 1.8 THz. Therefore, rst absorption peak of RDX at 0.84 THz can be easily investigated, while peaks of HMX and PETN, which are situated at 1.81 THz and 2.02 THz, respectively, are hard or impossible to identify [11].…”

Section: Introductionmentioning

confidence: 99%

Extension of the p-Spectrum Method to the Higher Frequencies

Pałka

2013

Acta Phys. Pol. A

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The p-spectrum method is a time domain spectroscopy-based technique for reection analysis of materials (including explosives) that takes into account only part of the reected signal, which is next analyzed via the Fourier transform. The method is limited to the frequencies of about 1.8 THz due to the pulse properties of our time domain spectroscopy setup. In this paper we theoretically prove that application of a shorter pulse can increase this frequency range up to 2.2 THz, that enables analysis of penthrite and octogen, two important explosives.

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Detection of covered materials in the TDS-THz setup

Cited by 5 publications

References 12 publications

Effective criteria developing for the identification of substance using the reflected THz signal

Effective criteria developing for the identification of substance using the reflected THz signal

Advances in explosives analysis—part II: photon and neutron methods

Extension of the p-Spectrum Method to the Higher Frequencies

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