波谱学杂志 ›› 2014, Vol. 31 ›› Issue (4): 465-476.doi: 10.11938/cjmr20140402

• 磁共振仪器研制技术进展专栏 • 上一篇    下一篇

超导磁体低温液位监测单元的设计与实现

陆建昌1,2,朱天雄1,陈俊飞1,2,李正刚1,刘朝阳1*   

  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:2014-05-29 修回日期:2014-10-29 出版日期:2014-12-05 发布日期:2014-12-05
  • 作者简介:陆建昌(1983-),男,广西蒙山人,硕士研究生,电子与通信工程专业,E-mail:lujc2001@163.com. *通讯联系人:刘朝阳,电话:027-87198790,E-mail:chyliu@wipm.ac.cn
  • 基金资助:

    国家重大科学仪器设备开发专项资助项目(2011YQ120035).

Design and Implementation of a Low-Temperature Liquid Level Monitor Unit for Superconducting Magnets

LU Jian-chang1,2,ZHU Tian-xiong1,CHEN Jun-fei1,2,LI Zheng-gang1,LIU Chao-yang1*   

  1. 1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance(Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan 430071, China;
    2. University of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-05-29 Revised:2014-10-29 Online:2014-12-05 Published:2014-12-05
  • About author:*Corresponding author:LIU Chao-yang, Tel: +86-027-87198790, E-mail: chyliu@wipm.ac.cn.
  • Supported by:

    国家重大科学仪器设备开发专项资助项目(2011YQ120035).

摘要:

介绍了一种应用于超导磁体的低温液位监测单元的设计与实现.设计了压控电流源电路和电压-频率转换电路用于液氦的液位测量,并设计了电容-频率转换电路用于液氮的液位测量;设计了以STM32 微控制器为核心的数字电路,用于压控电流源的控制、频率信号的处理和液位监测数据的数字化显示;同时通过CAN 总线把液位的监测数据自动发送至上位机,完成液位监测单元的远程控制.测试结果证明了该设计的可行性.

关键词: 超导磁体, 液氦, 液氮, 液位监测, 微控制器, CAN 总线

Abstract:

The design and implementation of a low-temperature liquid level monitor unit used in superconducting magnets is introduced. In the design, voltage-controlled current source circuit and voltage-frequency conversion circuit are used in liquid helium level measurement, and capacitance-frequency conversion circuit is used in liquid nitrogen level measurement. Digital circuit based on STM32 microcontroller is used to control the voltage-controlled current source, process the frequency signal, display the liquid-level data, send the liquid-level data to the upper computer and use CAN bus to complete the remote control of the unit. The feasibility of the design was demonstrated by experimental measurements.

Key words: superconducting magnet, liquid helium, liquid nitrogen, liquid-level monitoring, microcontroller, CAN bus

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