TNT detection with 14N NQR: Multipulse sequences and matched filter

Gregorovič, A.; Apih, T.

doi:10.1016/j.jmr.2009.02.011

Cited by 23 publications

(13 citation statements)

References 21 publications

(33 reference statements)

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“…These instruments permit to detect the samples of black power of tens of a milli− gram. The experiments with nuclear quadruple resonance (NQR) spectroscopy are carried as well [23][24][25][26][27], however, the sensitivity of this method is not satisfactory by now [28,29]. Finally, it can detect and image the volumes of high nitrogen concentration with g−ray systems by measuring the transmission characteristics of the objects.…”

Section: Detection Of Explosive Devicesmentioning

confidence: 99%

Towards optoelectronic detection of explosives

Wojtas

Stacewicz

Bielecki

et al. 2013

Opto-Electronics Review

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Detection of explosives is an important challenge for contemporary science and technology of security systems. We present an application of NOx sensors equipped with concentrator in searching of explosives. The sensors using CRDS with blue — violet diode lasers (410 nm) as well as with QCL lasers (5.26 μm and 4.53 μm) are described. The detection method is based either on reaction of the sensors to the nitrogen oxides emitted by explosives or to NOx produced during thermal decomposition of explosive vapours. For TNT, PETN, RDX, and HMX the detection limit better than 1 ng has been achieved.

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Section: Detection Of Explosive Devicesmentioning

confidence: 99%

Towards optoelectronic detection of explosives

Wojtas

Stacewicz

Bielecki

et al. 2013

Opto-Electronics Review

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“…Recently, more effective detectors have been proposed, exploiting more features in the NQR model. In [22], the authors proposed using the echo train model (2) together with a matched filter; in [11,15,17,23,24], generalized likelihood ratio tests were used in combination with the models presented in Section 2. Commonly, the amplitudes of the NQR signal were considered known to a multiplicative factor; however, in practice, this would not be the case in most realistic scenarios as the field at the sample will vary, causing variations in the NQR signal amplitudes.…”

Section: Detectorsmentioning

confidence: 99%

An Overview of NQR Signal Detection Algorithms

Butt

Gudmundson

Jakobsson

2013

NATO Science for Peace and Security Series B: Physics and Biophysics

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Nuclear quadrupole resonance (NQR) is a solid-state radio frequency spectroscopic technique that can be used to detect the presence of quadrupolar nuclei, that are prevalent in many narcotics, drugs, and explosive materials. Similar to other modern spectroscopic techniques, such as nuclear magnetic resonance, and Raman spectroscopy, NQR also relies heavily on statistical signal processing systems for decision making and information extraction. This chapter provides an overview of the current state-of-the-art algorithms for detection, estimation, and classification of NQR signals. More specifically, the problem of NQR-based detection of illicit materials is considered in detail. Several single-and multi-sensor algorithms are reviewed that possess many features of practical importance, including (a) robustness to uncertainties in the assumed spectral amplitudes, (b) exploitation of the polymorphous nature of relevant compounds to improve detection, (c) ability to quantify mixtures, and (d) efficient estimation and cancellation of background noise and radio frequency interference.The authors are at

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“…There are also some methods to increase the signal-to-noise ratio [21,22]. NQR is highly amenable to explosive analysis as these substances, such as TNT, RDX, HMTD [23,24] etc., are typically rich in 14N (nitrogen) nuclei with a spin quantum number of 1, having electric quadrupole moments [25]. The registered spectra are unique for a given explosive material and are not susceptible to the interference of other materials containing nitrogen during the NQR measurement.…”

Section: Bulk Detection Systemsmentioning

confidence: 99%

Sensors and Systems for the Detection of Explosive Devices - An Overview

Bielecki¹,

Janucki²,

Kawalec³

et al. 2012

Metrology and Measurement Systems

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The paper presents analyses of current research projects connected with explosive material sensors. Sensors are described assigned to X and γ radiation, optical radiation sensors, as well as detectors applied in gas chromatography, electrochemical and chemical sensors. Furthermore, neutron techniques and magnetic resonance devices were analyzed. Special attention was drawn to optoelectronic sensors of explosive devices.

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TNT detection with 14N NQR: Multipulse sequences and matched filter

Cited by 23 publications

References 21 publications

Towards optoelectronic detection of explosives

Towards optoelectronic detection of explosives

An Overview of NQR Signal Detection Algorithms

Sensors and Systems for the Detection of Explosive Devices - An Overview

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