Exploiting Spin Echo Decay in the Detection of Nuclear Quadrupole Resonance Signals
Somasundaram, Samuel D. ; Jakobsson, Andreas LU
; Smith, John A. S.
and Althoefer, Kasper
(2007)
In IEEE Transactions on Geoscience and Remote Sensing
45(4).
p.925-933
- Abstract
- Nuclear quadrupole resonance (NQR) is a radiofrequency technique that can be used to detect the presence of quadrupolar nuclei, such as the N-14 nucleus prevalent in many explosives and narcotics. In a typical application, one observes trains of decaying NQR echoes, in which the decay is governed by the spin echo decay time(s) of the resonant line(s). In most detection algorithms, these echoes are simply summed to produce a single echo with a higher signal-to-noise ratio, ignoring the decaying echo structure of the signal. In this paper, after reviewing current NQR signal models, we propose a novel NQR data model of the full echo train and detail why and how these echo trains are produced. Furthermore, we refine two recently proposed... (More)
- Nuclear quadrupole resonance (NQR) is a radiofrequency technique that can be used to detect the presence of quadrupolar nuclei, such as the N-14 nucleus prevalent in many explosives and narcotics. In a typical application, one observes trains of decaying NQR echoes, in which the decay is governed by the spin echo decay time(s) of the resonant line(s). In most detection algorithms, these echoes are simply summed to produce a single echo with a higher signal-to-noise ratio, ignoring the decaying echo structure of the signal. In this paper, after reviewing current NQR signal models, we propose a novel NQR data model of the full echo train and detail why and how these echo trains are produced. Furthermore, we refine two recently proposed approximative maximum-likelihood detectors that enable the algorithms to optimally exploit the proposed echo train model. Extensive numerical evaluations based on both simulated and measured NQR data indicate that the proposed detectors offer a significant improvement as compared to current state-of-the-art detectors. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1216163
- author
- Somasundaram, Samuel D.
; Jakobsson, Andreas
LU
; Smith, John A. S.
and Althoefer, Kasper
- publishing date
- 2007
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- explosives detection, multidimensional signal processing, quadrupole resonance, signal detection, SELECTIVE DETECTION, BURIED LANDMINES, NOISE, SPECTROSCOPY
- in
- IEEE Transactions on Geoscience and Remote Sensing
- volume
- 45
- issue
- 4
- pages
- 925 - 933
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- external identifiers
-
- scopus:33947671889
- ISSN
- 0196-2892
- DOI
- 10.1109/TGRS.2006.890413
- language
- English
- LU publication?
- no
- id
- 104f71b6-80e4-4331-b01c-f9554f75beca (old id 1216163)
- alternative location
- http://ieeexplore.ieee.org/iel5/36/4137841/04137868.pdf?tp=&arnumber=4137868&isnumber=4137841
- date added to LUP
- 2016-04-01 17:01:56
- date last changed
- 2022-03-07 18:05:15
@article{104f71b6-80e4-4331-b01c-f9554f75beca,
abstract = {{Nuclear quadrupole resonance (NQR) is a radiofrequency technique that can be used to detect the presence of quadrupolar nuclei, such as the N-14 nucleus prevalent in many explosives and narcotics. In a typical application, one observes trains of decaying NQR echoes, in which the decay is governed by the spin echo decay time(s) of the resonant line(s). In most detection algorithms, these echoes are simply summed to produce a single echo with a higher signal-to-noise ratio, ignoring the decaying echo structure of the signal. In this paper, after reviewing current NQR signal models, we propose a novel NQR data model of the full echo train and detail why and how these echo trains are produced. Furthermore, we refine two recently proposed approximative maximum-likelihood detectors that enable the algorithms to optimally exploit the proposed echo train model. Extensive numerical evaluations based on both simulated and measured NQR data indicate that the proposed detectors offer a significant improvement as compared to current state-of-the-art detectors.}},
author = {{Somasundaram, Samuel D. and Jakobsson, Andreas and Smith, John A. S. and Althoefer, Kasper}},
issn = {{0196-2892}},
keywords = {{explosives detection; multidimensional signal processing; quadrupole resonance; signal detection; SELECTIVE DETECTION; BURIED LANDMINES; NOISE; SPECTROSCOPY}},
language = {{eng}},
number = {{4}},
pages = {{925--933}},
publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
series = {{IEEE Transactions on Geoscience and Remote Sensing}},
title = {{Exploiting Spin Echo Decay in the Detection of Nuclear Quadrupole Resonance Signals}},
url = {{http://dx.doi.org/10.1109/TGRS.2006.890413}},
doi = {{10.1109/TGRS.2006.890413}},
volume = {{45}},
year = {{2007}},
}