Screening mail for powders using terahertz technology

Kemp, M. C.

doi:10.1117/12.898093

Cited by 9 publications

(7 citation statements)

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“…And vice versa, the pair is not allocated if there is at least one another pair lying above it. (6) give the same results. Therefore, the modified integral characteristics (5), (6) allocate two absorption frequencies of RDX -ν=0.82, 2.18 THz -in the time interval containing the first sub-pulse of the reflected RDX_08 signal.…”

Section: Modified Integral Correlation Criteriasupporting

confidence: 81%

“…15c,d) there are minima at frequency ν=1. 6 THz, for which we also build the dynamics of spectral lines. In Fig.…”

Section: Signals Rth Rtp and Their Spectramentioning

confidence: 99%

“…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%

“…They are computed using the spectral dynamics of RDX_08 signal at frequencies ν = 0.6, 0.82, 1.0, 1.2 THz and spectral dynamics of the transmitted RDX signal at characteristic absorption frequency ν = 0.82 THz. We denote these pairs of frequencies for brevity as ν =(0 6,. 0.82), (0.82, 0.82), (1.0, 0.82), (1.2, 0.82) THz.…”

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confidence: 99%

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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: Modified Integral Correlation Criteriasupporting

confidence: 81%

“…15c,d) there are minima at frequency ν=1. 6 THz, for which we also build the dynamics of spectral lines. In Fig.…”

Section: Signals Rth Rtp and Their Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…THz frequencies may find use in medicine (Siegel 2004), as an alternative to X-rays in certain imaging applications (Hu and Nuss 1995), in security for detecting explosives (Shen et al 2005), in narcotics identification systems (Lu et al 2006), in bio-defense (Woolard et al 2003;Kemp 2011), in chemistry and biology for materials identification (Fischer et al 2005; Boss AFN, Migliano ACC, Wilke I Kiwa et al 2007), and other areas such as astronomy (Kulesa 2011;Smirnov et al 2012), space science (Siegel 2007), plasma physics (Tauk et al 2006), and aerospace applications (Petkie et al 2009;Chen 2007).…”

Section: Introductionmentioning

confidence: 99%

Copper Cobalt Magnetic Ceramic Materials Characterization at Terahertz Frequencies

Boss

Migliano

Wilke

2017

J.Aerosp. Technol. Manag.

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This study presents the complex index of refraction and the complex permittivity of a magnetic ceramic material made of copper, cobalt, and iron oxides. The index of refraction and the extinction coefficient of the CuCo-ferrite exhibit an almost frequency independent behavior and were averaged to n = 3.62 ± 0.05 and k = 0.06 ± 0.02, respectively, over the frequency range from 0.2 to 1 THz. The corresponding complex permittivity was ε' = 13.12 ± 0.35 for the real part and ε'' = 0.46 ± 0.15 for the imaginary one. The absorption coefficient and the transmittance of the CuCo-ferrite were also determined. The absorption coefficient exhibits a dip at ~0.35 THz, which corresponds to a peak in transmittance at this frequency. The impact of the observations on the potential realization of novel THz electronic devices is discussed.

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