Chinese Journal of Magnetic Resonance ›› 2014, Vol. 31 ›› Issue (4): 465-476.doi: 10.11938/cjmr20140402

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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).

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

CLC Number: