The method of the spectral dynamics analysis of reflected signal for problem of identification of substance

Trofimov, Vyacheslav A.; Varentsova, Svetlana A.; Pałka, Norbert; Szustakowski, Mieczysław; Trzciński, Tomasz Piotr

doi:10.1117/12.883672

Cited by 9 publications

(21 citation statements)

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“…We showed that the identification accuracy increases significantly in comparison with the results obtained earlier in [19], [20].…”

Section: Introductionsupporting

confidence: 42%

“…Note that one of the first identifiers of the explosive RDX in reflection mode, obtained by SDA-method, was reradiation at frequencies ν=0.8-0.9 THz after the main pulse, visible in the spectrogram of the main pulse of THz signal reflected from pellet with pure or covered RDX. This fact was first established by our research group in [15], [19], [20].…”

Section: Sda and P-spectrum Methodsmentioning

confidence: 74%

“…For comparison with p-Spectrum method we use the THz signals reflected in the Stand-Off mode from pellets with pure RDX and RDX under thin Polyethylene with weight 800 mg (i.e. the investigated above signal RDX_08 and signal RDX_PE_08 first studied in [19]). …”

Section: Sda and P-spectrum Methodsmentioning

confidence: 99%

“…The weight of all pellets is 800 mg. Measurements were carried out with the Stand-Off unit (see [19], Fig.1a), the samples were placed nearly perpendicular to the beam -with 6º incident angle for 300 mm distances. All measured reflected signals (denoted as ( ) R S t ) are long-term with duration about 180 ps.…”

Section: Identification Of Explosives Rdx Hmx and Petn In Reflectionmentioning

confidence: 99%

“…In the transmission mode, the SDA-method was successfully applied for the identification of explosives, including those hidden under opaque covers; substances in compound media; the mixture of substances with similar Fourier spectra in GHz and THz ranges of frequencies; drugs [15][16][17][18]. In [19][20][21][22][23][24][25][26] we showed the possibility to apply the SDA method for the detection and identification of substances using the reflected THz signal in various situations. In [23] the integral criteria of probability assessment for the detection and identification of substance were proposed.…”

Section: Introductionmentioning

confidence: 97%

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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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“…We showed that the identification accuracy increases significantly in comparison with the results obtained earlier in [19], [20].…”

Section: Introductionsupporting

confidence: 42%

Section: Sda and P-spectrum Methodsmentioning

confidence: 74%

Section: Sda and P-spectrum Methodsmentioning

confidence: 99%

Section: Identification Of Explosives Rdx Hmx and Petn In Reflectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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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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Detection of covered materials in the TDS-THz setup

Pałka

2013

SPIE Proceedings

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Possibility of the detection and identification of substance at long distance using the noisy reflected THz pulse under real conditions

Trofimov

Varentsova

Trofimov

2015

Terahertz Physics, Devices, and Systems IX: Advanced Applications in Industry and Defense

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We show possibility of the detection and identification of substance at long distance (several metres, for example) using the THz pulse reflected from the object under the real conditions: at room temperature and humidity of about 70%. The main feature of this report consists in a demonstration of the detection and identification of substance using the computer processing of the noisy THz pulse. Amplitude of the useful signal is less than the amplitude of a noise. Nevertheless, it is possible to detect "fingerprint" frequencies of substance if these frequencies are known and the SDA method is used together with new assessments for probability estimation for presence of detected frequencies. Essential restrictions of the commonly used THz TDS method for the detection and identification under real conditions (at long distance about 3.5 m and at a high relative humidity more than 50%) are demonstrated using the physical experiment with chocolate bar and thick paper bag. We show also that the THz TDS method detects spectral features of dangerous substances even in the THz signals measured in laboratory conditions (at distance 30-40 cm from the receiver and at a low relative humidity less than 2%); the n-Si and p-Si semiconductors were used as neutral substances. However, the integral correlation and likeness criteria, based on SDA method, allow us to detect the absence of dangerous substances in the samples. Current results show feasibility of using the discussed method of the THz pulsed spectroscopy for the counter-terrorism problem.

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The method of the spectral dynamics analysis of reflected signal for problem of identification of substance

Cited by 9 publications

References 0 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

Detection of covered materials in the TDS-THz setup

Possibility of the detection and identification of substance at long distance using the noisy reflected THz pulse under real conditions

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