Simulation of magnetic field distribution of excitation coil for EM flow meter and its validation using magnetic camera
Simulation of magnetic field distribution of excitation coil for EM flow meter and its validation using magnetic camera
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发表时间：
2008-10
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通讯作者：
Jingzhuo Wang;G. Tian;A. Simm;G. Lucas
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作者：
Jingzhuo Wang;G. Tian;A. Simm;G. Lucas
电磁流量计中的磁通密度分布对于获得准确的流量具有重要意义。分析了用于电磁流量计流量管横截面产生均匀磁通密度的亥姆霍兹线圈。本文利用有限元分析软件COMSOL中的EM模块建立了仿真模型，并对磁通密度分布进行了实验测试，以验证其均匀性。研制了一种基于霍尔传感器的二维磁摄像系统。采用美国国家仪器公司的PCI6255数据采集卡采集磁场数据，给出了仿真结果和测量结果，并进行了比较。该研究为电磁流量计电极传感器阵列的设计提供了依据。此外，磁通密度的分布数据有助于提高电磁流量计流量的准确测量。
Distribution of magnetic flux density in electromagnetic (EM) flow meter is significantly important for obtaining accurate flow rate. Analysis of Helmholtz coils used to generate homogeneous magnetic flux density in the cross section of flow pipe of electromagnetic (EM) flow meter is presented in this paper. In this work a simulation model with the EM module of finite element analysis software, COMSOL, is built and experimental testing of the distribution of magnetic flux density is applied to verify its uniformity. A 2D magnetic camera system with 64 Hall sensors is prototyped. The magnetic field data are picked up by the National Instruments PCI 6255 data acquisition card.The results from the simulation and measurements are presented and compared in the paper. The study helps to design the electrode sensor arrays of EM flow meter. In addition to this, the distribution data of magnetic flux density are useful for the improvement of accurate flow rate measurement of EM flow meter.