Chinese Journal of Magnetic Resonance >
Design and Implementation of a Low-Temperature Liquid Level Monitor Unit for Superconducting Magnets
Received date: 2014-05-29
Revised date: 2014-10-29
Online published: 2014-12-05
Supported by
国家重大科学仪器设备开发专项资助项目(2011YQ120035)．
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.
LU Jian-chang1 , 2 , ZHU Tian-xiong1 , CHEN Jun-fei1 , 2 , LI Zheng-gang1 , LIU Chao-yang1* . Design and Implementation of a Low-Temperature Liquid Level Monitor Unit for Superconducting Magnets[J]. Chinese Journal of Magnetic Resonance, 2014 , 31(4) : 465 -476 . DOI: 10.11938/cjmr20140402
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