NMR永磁体精密温度控制器的设计与实现

doi:10.11938/cjmr20182632

波谱学杂志 ›› 2018, Vol. 35 ›› Issue (3): 294-302.doi: 10.11938/cjmr20182632

NMR永磁体精密温度控制器的设计与实现

杨畅^1,2, 陈俊飞^1,2, 陈黎¹, 张志¹, 冯继文¹, 陈方¹, 刘朝阳¹

1. 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(中国科学院武汉物理与数学研究所), 湖北武汉 430071;
2. 中国科学院大学, 北京 100049

收稿日期:2018-04-16 出版日期:2018-09-05 发布日期:2018-08-28
通讯作者: 刘朝阳,Tel:027-87199686,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（ZDYZ2010-2）；国家重大科研仪器研制项目（81627901）；国家自然科学基金资助项目（11575287）；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（YZ201677，YZ201551）.

Design and Implementation of NMR Permanent Magnet Precision Temperature Controller

YANG Chang^1,2, CHEN Jun-fei^1,2, CHEN Li¹, ZHANG Zhi¹, FENG Ji-wen¹, CHEN Fang¹, 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 Bio-magnetic Resonance Analysis(Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan 430071, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2018-04-16 Online:2018-09-05 Published:2018-08-28

摘要/Abstract

摘要： 低场核磁共振（low-field NMR）谱仪常采用钕铁硼（NdFeB）永磁体提供静磁场.NdFeB对温度非常敏感，磁体温度变化会引起磁场漂移，影响NMR实验的可靠性.为提高低场磁共振谱仪的稳定性，本文提出了一种基于双回路控制算法的磁共振永磁体精密温度控制方案，并在0.06 T磁共振谱仪上进行验证.结果表明：24 h内控温精度达到±0.005℃；相比无温控时，质子共振频率0.5 h内漂移量由255 Hz减小至15 Hz，24 h内漂移量由4 950 Hz减小至145 Hz，有效提高了低场磁共振谱仪永磁体的稳定性.

关键词: 低场磁共振(low-field NMR), 精密温度控制器, 双回路控制算法, 永磁体

Abstract: Neodymium-iron-boron (NdFeB) permanent magnets always used to generate a static magnetic field in low field NMR spectrometers has poor temperature stability. Temperature fluctuations will affect the reliability of NMR experiments. In order to improve the stability of low-field magnetic resonance spectrometer, a precise temperature control scheme of permanent magnet based on dual-loop control algorithm was proposed and verified on 0.06 T NMR spectrometer. The results show that the 24 h temperature control accuracy is better than ±0.005℃. And the drift in ¹H resonance frequency decreases from 255 Hz to 15 Hz within 0.5 h, and from 4 950 Hz to 145 Hz within 24 h, compared to that without temperature control. That improves the stability of low-field NMR spectrometer with permanent magnet effectively.

Key words: low-field NMR, precision temperature controller, double-loop control algorithm, permanent magnet

中图分类号:

O482.53

杨畅, 陈俊飞, 陈黎, 张志, 冯继文, 陈方, 刘朝阳. NMR永磁体精密温度控制器的设计与实现[J]. 波谱学杂志, 2018, 35(3): 294-302.

YANG Chang, CHEN Jun-fei, CHEN Li, ZHANG Zhi, FENG Ji-wen, CHEN Fang, LIU Chao-yang. Design and Implementation of NMR Permanent Magnet Precision Temperature Controller[J]. Chinese Journal of Magnetic Resonance, 2018, 35(3): 294-302.

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NMR永磁体精密温度控制器的设计与实现

Design and Implementation of NMR Permanent Magnet Precision Temperature Controller

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