Research of Landmine Detection Using Terahertz Technology

Miao, Qi; Wang, Gao; Li, Yang Jun

doi:10.4028/www.scientific.net/amm.644-650.1313

Cited by 4 publications

(5 citation statements)

References 9 publications

(6 reference statements)

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“…Secondly, the wide spectral range of the THz waves can be used to characterize the composition of matter [6,7]. Thirdly, the THz waves are highly penetrating for many substances, providing a different and more efficient solution for search and rescue [8,9]. Based on these advantages of the THz waves, an increasing number of scientific publications can be found in the field of THz technology.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Thermal Sensing by Using a Defect-Containing Periodically Corrugated Gold Waveguide

Xue

Wang

et al. 2020

Applied Sciences

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A terahertz (THz) thermal sensor has been developed by using a periodically corrugated gold waveguide. A defect was positioned in the middle of this waveguide. The periodicities of waveguides can result in Bragg and non-Bragg gaps with identical and different transverse mode resonances, respectively. Due to the local resonance of the energy concentration in the inserted tube, a non-Bragg defect state (NBDS) was observed to arise in the non-Bragg gap. It exhibited an extremely narrow transmission peak. The numerical results showed that by using the here proposed waveguide structure, a NBDS would appear at a resonance frequency of 0.695 THz. In addition, a redshift of this frequency was observed to occur with an increase in the ambient temperature. It was also found that the maximum sensitivity can reach 11.5 MHz/K for an optimized defect radius of 0.9 times the mean value of the waveguide inner tube radius, and for a defect length of 0.2 (or 0.8) times the corrugation period. In the present simulations, a temperature modification of the Drude model was also used. By using this model, the thermal sensing could be realized with an impressive sensitivity. This THz thermal sensor is thereby very promising for applications based on high-precision temperature measurements and control.

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Section: Introductionmentioning

confidence: 99%

Terahertz Thermal Sensing by Using a Defect-Containing Periodically Corrugated Gold Waveguide

Xue

Wang

et al. 2020

Applied Sciences

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“…As it is well-known, one of the promising ways to solve this problem is the use of terahertz radiation [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. It bases on the fact that the frequencies of vibrational or rotational inter-level energy transitions of many chemical compounds, including explosives, lie in the terahertz frequency range.…”

Section: Introductionmentioning

confidence: 99%

“…shows the Fourier spectra of the remote part of the signal PWM_40 and Reference signal for t=[70, 170] ps. Unlike the previous case of identification using the first sub-pulse, the frequencies ν=1 15,. 1.4 THz do not correspond to the spectrum minima (a), and there is no high absorption in the spectrum of Reference signal at ν=1.15, t depicted in (c), (d), show that the frequencies ν=1.15 THz and ν=1.4 THz are not Proc.…”

mentioning

confidence: 96%

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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“…Detection and identification of drugs, explosives and others hazardous chemical and biological substances is among the most demanding security problems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. At the same time THz spectroscopy holds large potential in the field of nondestructive, non-invasion testing, as well as for quality inspection of pharmaceuticals and food products [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Efficiency of using the spectral dynamics analysis for pulsed THz spectroscopy of both explosive and other materials

Trofimov

Varentsova

2015

SPIE Proceedings

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One of the modern problems arising in the detection and identification of substances is a development of criteria for the assessment of a presence of explosive (or other dangerous substance) fingerprints in THz signals transmitted through or reflected from a sample. Obviously, criteria depend on the method used for the substance detection and identification. Taking into account our previous experience, we use for a solution of this problem the SDA method (method of the spectral dynamics analysis). Essential restrictions of usually 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 paper napkins 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%) with semiconductors of different types used as samples. However, the integral correlation criteria, based on SDA method, allows us to detect the absence of dangerous substances in semiconductors. In order to demonstrate the possibilities of the integral criteria for finding additional substances in the mixture with semiconductors, we modeled several mixtures of n-doped Silicon with neutral substance Soap in different ratio. The discussed algorithms show high probability of the substance identification and a reliability of realization in practice, especially for non-destructive testing and security applications.

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Research of Landmine Detection Using Terahertz Technology

Cited by 4 publications

References 9 publications

Terahertz Thermal Sensing by Using a Defect-Containing Periodically Corrugated Gold Waveguide

Terahertz Thermal Sensing by Using a Defect-Containing Periodically Corrugated Gold Waveguide

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

Efficiency of using the spectral dynamics analysis for pulsed THz spectroscopy of both explosive and other materials

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