Design of the Handheld NMR Console

doi:10.11938/cjmr20243108

Abstract

Abstract:

Conventional nuclear magnetic resonance (NMR) instruments are large and difficult to carry, which limits their application in fields such as on-site petroleum exploration, food safety, environmental pollution, and quality control. To address this issue, this paper proposes a design of a handheld NMR console. By utilizing an advanced RISC machine (ARM) core construction, field programmable gate array (FPGA) logic design and control program design on a programmable system-on-chip Zynq-7000, the entire handheld NMR console was designed and implemented. After completing the entire design, several basic pulse sequences, including free induction decay (FID), spin echo (SE), and Carr-Purcel1-Meiboom-Gill (CPMG), were tested on a 0.5 T desktop NMR system developed by our research group. The tests validated the correctness of the overall architecture design and the coordination among various modules. The designed NMR console is 10.6 cm long, 6.0 cm wide, and 1.9 cm high, which significantly reduces the size while enhancing the real-time performance of pulse sequence and improving the stability of the console, laying a foundation for further development of portable NMR instruments.

Key words: NMR, console, FPGA, advanced RISC machine, miniature

CLC Number:

O482.53

LI Mingdao, YAO Shouquan, XU Juncheng, LV Xinglong, HE Fengcheng, JIANG Yu. Design of the Handheld NMR Console[J]. Chinese Journal of Magnetic Resonance, 2024, 41(3): 257-265.

Figures/Tables 9

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参数名称	设计指标
脉冲序列最短时间	24.41 ns
脉冲序列时间分辨率	16.27 ns
射频信号频率范围	0.1~50 MHz
射频信号频率分辨率	0.44 μHz
射频信号相位分辨率	0.0055°
射频信号幅度分辨率	14 bit
系统时钟频率	122.88 MHz
系统时钟稳定性	±28 ppm
ADC采样频率	122.88 MHz
ADC采样分辨率	16 bit
DDC抽取范围	25~500000