Cardona Lorena, Itozaki Hideo, Jiménez Jovani, Vanegas Nelson, Sato-Akaba Hideo
Department of Mechanical Engineering, Faculty of Engineering, Institución Universitaria Pascual Bravo, Calle 73 No. 73A - 226, Colombia.
Department of Computation and Decision Science, School of Mines, Universidad Nacional de Colombia, Carrera 80 No. 65-223, Medellin, Antioquia, Colombia.
Heliyon. 2020 Feb 1;6(1):e03242. doi: 10.1016/j.heliyon.2020.e03242. eCollection 2020 Jan.
This paper shows the design of a radio-frequency transceiver coil for landmine detection in Colombia by nuclear quadrupole resonance (NQR). The radio-frequency transceiver coil is of great importance as it is responsible for exciting the target explosive and for picking up the weak NQR signal; however, little detail is found on the literature about its design. The strategy followed on this work consisted on constructing and experimentally comparing five different radio-frequency transceiver coils, whose dimensions were selected according to four design parameters: noise rejection, magnetic flux density, coil sensitivity, and quality factor; taking into account the characteristics of landmines in Colombia, the second country most affected by anti-personnel mines in the world. The constructed coils were experimentally compared using a portable system and with three of them, the system was capable of detecting 200 g ammonium nitrate (the main substance used in Colombian landmines) up to 3 cm from the coil within 12 s, with a steady-state free precession pulse sequence. Conclusions from this work could help to guide RF coil design in other works that apply NQR for remote detection of substances in non-shielded environments and to direct future research about landmine detection in Colombia.
本文展示了一种用于哥伦比亚地雷探测的射频收发线圈的设计，该探测采用核四极共振（NQR）技术。射频收发线圈非常重要，因为它负责激发目标爆炸物并拾取微弱的NQR信号；然而，关于其设计的文献细节很少。这项工作所采用的策略是构建并通过实验比较五个不同的射频收发线圈，其尺寸根据四个设计参数选定：噪声抑制、磁通密度、线圈灵敏度和品质因数；考虑到哥伦比亚是世界上受杀伤人员地雷影响第二严重的国家，以及该国地雷的特点。使用一个便携式系统对构建的线圈进行了实验比较，其中三个线圈的系统能够在12秒内，利用稳态自由旋进脉冲序列，检测到距离线圈3厘米以内的200克硝酸铵（哥伦比亚地雷中使用的主要物质）。这项工作的结论有助于指导其他将NQR应用于非屏蔽环境中物质远程探测的工作中的射频线圈设计，并为哥伦比亚未来的地雷探测研究提供方向。
