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

doi:10.11938/cjmr20202823

Chinese Journal of Magnetic Resonance ›› 2021, Vol. 38 ›› Issue (1): 1-11.doi: 10.11938/cjmr20202823

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

FENG Tao^1,2, CHEN Jun-fei¹, ZHANG Zhen^1,2, YANG Chun-sheng^1,2, ZHANG Zhi¹, LIU Chao-yang¹

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

Abstract

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

CLC Number:

O482.53

FENG Tao, CHEN Jun-fei, ZHANG Zhen, YANG Chun-sheng, ZHANG Zhi, LIU Chao-yang. A Design of Short Dead-Time RF Coil and RF Switch for Low-Field NMR[J]. Chinese Journal of Magnetic Resonance, 2021, 38(1): 1-11.

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

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