波谱学杂志 ›› 2021, Vol. 38 ›› Issue (1): 1-11.doi: 10.11938/cjmr20202823

• 研究论文 • 上一篇    下一篇

低场核磁共振短死时间射频线圈与射频开关的设计

冯涛1,2, 陈俊飞1, 张震1,2, 杨春升1,2, 张志1, 刘朝阳1   

  1. 1. 中国科学院精密测量科学与技术创新研究院, 中国科学院武汉物理与数学研究所, 波谱与原子分子物理国家重点实验室, 武汉磁共振中心, 中国科学院生物磁共振分析重点实验室, 湖北 武汉 430071;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2020-03-29 出版日期:2021-03-05 发布日期:2020-05-09
  • 通讯作者: 刘朝阳 Tel: 02787199686, E-mail: chyliu@wipm.ac.cn. E-mail:chyliu@wipm.ac.cn
  • 基金资助:
    国家重大科研装备研制项目(81627901);国家重点研发计划重点专项(2018YFC0115000);国家自然科学基金青年科学基金资助项目(11705274);中国科学院科研装备研制项目(YZ201551,YZ201677).

A Design of Short Dead-Time RF Coil and RF Switch for Low-Field NMR

FENG Tao1,2, CHEN Jun-fei1, ZHANG Zhen1,2, YANG Chun-sheng1,2, ZHANG Zhi1, LIU Chao-yang1   

  1. 1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, CAS Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-03-29 Online:2021-03-05 Published:2020-05-09

摘要: 本文以核磁共振(NMR)射频线圈振铃信号产生原理为对象进行分析研究,提出了一种适用于低场环境下由环状间隙腔线圈与螺线管线圈构成的收发分离式短死时间射频线圈设计方案,采用优化调谐匹配网络提高发射效率;根据射频线圈方案需求设计了快速切换的射频开关及驱动.在此基础上依据仿真结果制作了短死时间射频线圈,并应用于自主研制的低场9.51 MHz便携式NMR谱仪系统,进行NMR实验,结果显示可将收发切换时间缩短至10 μs以内,验证了该设计方案的可行性.

关键词: 低场核磁共振(low-field NMR), 短死时间射频线圈, 振铃信号, 环状间隙腔(LGR)线圈, 射频开关及驱动, 失谐

Abstract: Based on the ring-down signal generation principle of nuclear magnetic resonance (NMR), we presented here a design scheme of transmitting and receiving separated short dead-time radio frequency (RF) coil composed of loop-gap resonator (LGR) coil and solenoid coil in low-field NMR system, to improve transmission efficiency by optimizing tuning and matching network. We also designed a fast RF switch and driver to fulfill the requirement of the RF coil. Based on the simulation results, the short dead-time RF coil was fabricated and applied to a self-developed 9.51 MHz portable low-field NMR spectrometer. The NMR experiments showed that the dead-time was reduced to less than 10 μs, which verified the feasibility of the design scheme.

Key words: low-field nuclear magnetic resonance, short dead-time radio frequency coil, ring-down signal, loop-gap resonator coil, radio frequency switch and driver, detuned

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