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| Design and simulation of three-axis Helmholtz coil used in magnetic sensor testing system |
| LIU Zhong-si1,2, YANG Jian-zhong2,3,4, ZHANG Fan1, LI Bin2,3,4, CHEN Wan-wan2 |
1.College of Instrument Science and Photoelectric Engineering, Beijing Information Science and Technology University, Beijing 100192, China
2.Department of Precision Instruments, Tsinghua University, Beijing 100084, China
3.State Key Laboratory of Precision Measurement Technology and Instrument, Tsinghua University, Beijing 100084, China
4.Beijing Innovation Center for Future Chips, Tsinghua University, Beijing 100084, China |
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Abstract Magnetic cardiogram has a unique advantage in the diagnosis of heart-related diseases. In the development of sensor for measuring cardiac magnetic field (called magnetic sensor the next), it is necessary to test the sensor under the simulated magnetic field environment of cardiac magnetic field. A Helmholtz coil used in the magnetic sensor testing system was designed to generate a dynamic magnetic field with pT magnetic induction and simulate the magnetic environment to meet the testing requirements of a magnetic sensor. According to the principle of magnetic field generation of Helmholtz coil, the magnetic shielding barrel was used to shield the environment magnetic field. Through calculation, the parameters such as coil size, coil turns, wire length and wire cross-section diameter were designed. COMSOL Multiphysics simulation software was used to simulate the static magnetic field distribution uniformity produced by Helmholtz coil and the dynamic characteristics of the magnetic field when the current in the coil changed. The simulation results showed that the designed Helmholtz coil met the design requirements, and could produce the heart-like magnetic field waveform with a magnetic field intensity of about 100 pT, a uniformity of less than 5% and good waveform real-time performance, and provided a good test environment for the measurement of the magnetic sensor. The designed Helmholtz coil can be used to test the magnetic sensor, which lays a foundation for the practical application of the magnetic sensor.
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Received: 26 September 2018
Published: 28 April 2019
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用于心磁传感器测试系统的三轴向亥姆赫兹线圈的设计与仿真
心磁检测对于心脏相关疾病的诊断具有独特优势，在用于测量心脏磁场的传感器(下称心磁传感器）的研制过程中，需要在模拟心磁的磁场环境下进行测试工作。基于此，设计了一个用于心磁传感器测试系统的亥姆赫兹线圈，它可以产生磁感应强度为pT级的动态磁场，模拟心磁环境，以满足心磁传感器测试的需求。根据亥姆赫兹线圈的磁场产生原理，使用磁屏蔽筒对环境磁场进行屏蔽，通过计算确定了线圈尺寸、线圈匝数、导线长度及导线横截面直径等参数。使用COMSOL Multiphysics仿真软件对亥姆赫兹线圈产生的静态磁场的分布均匀性以及通入线圈电流变化时磁场的动态特性进行仿真分析。仿真结果表明，所设计的亥姆赫兹线圈满足设计要求，能够产生磁场强度为100 pT左右、均匀度小于5%、波形实时性好的类心脏磁场波形，为心磁传感器的测试提供了良好的测试环境。所设计的亥姆赫兹线圈能够用于心磁传感器的测试工作，为心磁传感器的实际应用奠定了基础。
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