Design of the Radio Frequency Coil in a Nuclear Quadrupole Resonance (NQR) Explosive Detection System

Abstract

Abstract:

The radio frequency (RF) coil is a key component in the nuclear quadrupole resonance (NQR) explosive detection system to pick up the signals. In this study, we aimed to optimize the design of small-sized solenoid coils for NQR explosive detection, including the diameter, length and number of turns of the coil. Experimental tests showed that the optimized coil had high sensitivity, and could be used to detect the NQR signals of explosives quickly and accurately.

Key words: nuclear quadrupole resonance (NQR), explosive detection, solenoid coil, signal-to-noise ratio

CLC Number:

O482.53

HAO Feng-long*，XU Geng-guang，HUANG Xue-yi. Design of the Radio Frequency Coil in a Nuclear Quadrupole Resonance (NQR) Explosive Detection System[J]. Chinese Journal of Magnetic Resonance.

References

[1] Shi Guang-ming(石光明), Xu Geng-guang(徐更光), Wang Tin-zeng(王廷增). Applications of nuclear quadrupole resonance in explosives detection(核四极共振在炸药探测上的应用)[J]. Chinese Journal of Explosives & Propellants(火炸药学报), 2004, 27 (3): 70-73.

[2] Miller J B, Barrall G A. Explosives detection with nuclear quadrupole resonance: An emerging technology will help to uncover land mines and terrorist bombs[J]. American Scientist, 2005, 93(1): 50-57.

[3] Ferrari M, Retournard A, Canet D. Nitrogen-14 nuclear quadrupole resonance (NQR): dramatic sensitivity -enhancement by large and fast temperature lowering[J]. J Magn Reson, 2007, 188(2): 275-278.

[4] Itozaki H, Ota G. Nuclear quadrupole resonance for explosive detection[J]. International Journal on Smart Sensing and Intelligent Systems, 2008, 1(3): 705-715.

[5] Mozzhukhin G V, Efremov A V, Bodnya A V, et al. A two-spiral flat coil for detecting ¹⁴N NQR signals[J]. Russ Phys J, 2005, 48(9): 978-983.

[6] Minard K R, Wind R A. Solenoidal microcoil designPart11: Optimizing winding parameters for maximum signal-to-noise performance[J]. Concepts Magn Reson, 2001, 13(3): 190-210.

[7] Peshkovsky A S, Cattena C J, Cerioni L M, et al. Noise-resilient multi-frequency surface sensor for nuclear quadrupole resonance[J]. J Magn Reson, 2008, 194(2): 222-229.

[8] Deas R M, Gaskell M J, Long K, et al. An NQR study of the crystalline structure of TNT[C]. Bellingham: Proc. SPIE, 2004. 510-520.

[9] Alan Gregorovic, Toma- Apih. Aplicability of TNT “super Q- detection” to multipulse sequences[J]. J Magn Reson, 2009, 201(2): 131-136.

[10] Yang Yan(阳燕), Sun Yi-bin(孙宜斌), He Xue-hui(何学辉), et al. The design of a probe used in nuclear quadrupole resonance detection system(一种核四极共振探测系统中天线探头的设计方法)[J]. Chinese J Magn Reson(波谱学杂志), 2013, 30(1): 113-120.

[11] Chen Xing(陈星), Xu Geng-guang(徐更光). NQR probe recovery time reduction with a novel active Q -switching circuit(一种快速有效的NQR探头恢复方法)\[J\]. Chinese J Magn Reson(波谱学杂志), 2008, 25(3): 397-401.

[12] Li G Y, Xia X J, Xie H B, et al. A novel probe design for pulsed nitrogen-14 nuclear quadrupole resonance spectrometer[J]. Rev Sci Instrum, 1996, 67(3): 704-706.

[13] Mozzhukhin G V, Rameev B Z, Dogan N, et al. Secondary signals in two-frequency nuclear quadrupole resonance on 14-N nuclei with I=1[J]. J Magn Reson, 2008, 193(1): 49-53.

[14] Minard K R, Wind R A. Solenoidal microcoil design-Part1: Optimizing RF homogeneity and coil dimensions[J]. Concepts Magn Reson, 2001, 13(2): 128-142.

[15] Lei Zhao-yin(雷照银). Magnetic Field Computation of Axisymmetric Coil(轴对称线圈磁场计算)[M]. Beijing(北京): China Metrology Publishing House(中国计量出版社), 1991.

[16] Wei Shu-feng(魏树峰), Yang Wen-hui(杨文晖), Guo Li-hui(郭丽慧), et al. A RF transmit coil designed for open magnetic resonance imaging(一种用于开放式MRI的射频发射线圈设计)[J]. Chinese J Magn Reson(波谱学杂志), 2012, 29(3): 354-360.

[17] Wang Xiao-hui(王晓辉), Tang Lu-xin(唐露新), Li Yun-zhi(李运智), et al. Electrical-magnetic field shield technology and material development(电磁屏蔽技术及材料应用研究新动向)[J]. Development and Application of Materials(材料开发与应用), 2008, 23(2): 67-71.