The electromagnetic flow meter (EMF) is one of the most suitable flowmeter for slurry measurement. It is an important research point of electromagnetic flowmeter to overcome slurry noise in slurry measurement. The main approach to overcome slurry noise is to modify the excitation method and to improve the signal processing method. The novelty of this paper is the first study on the mechanism of excitation switching process to overcome slurry noise. The vortex electric field generated during excitation switching is theoretically analyzed and simulated based on Maxwell's equations. In order to evaluate the effectiveness of the vortex electric field to overcome the slurry noise, an experiment based on the step excitation signal is proposed. The results of the slurry noise power spectrum show that the increase of the excitation switching process can effectively suppress the slurry noise. The experimental results are consistent with the simulation results. On this basis, the stepwise excitation EMF was developed. Comparison results with conventional three-value excitation EMF show that increasing of excitation switch can effectively suppress slurry noise in real industrial measurement scenarios.

中文翻译：

---

电磁流量计励磁切换过程克服浆体噪声的机理研究


电磁流量计（EMF）是最适合泥浆测量的流量计之一。克服浆液测量中的浆液噪声是电磁流量计的一个重要研究点。克服浆体噪声的主要途径是修改激励方法和改进信号处理方法。本文的新颖之处在于首次研究了励磁切换过程克服浆料噪声的机理。基于麦克斯韦方程组对励磁切换过程中产生的涡旋电场进行了理论分析和仿真。为了评估涡流电场克服浆体噪声的有效性，提出了基于阶跃激励信号的实验。浆体噪声功率谱结果表明，励磁切换过程的增加可以有效抑制浆体噪声。实验结果与模拟结果一致。在此基础上，发展了步进励磁电动势。与传统三值励磁电动势的对比结果表明，增加励磁开关可以有效抑制实际工业测量场景中的浆料噪声。