An Improved Electromagnetic Flowmeter

Abstract

Electromagnetic flowmeters are widely used in industrial production or control. However, the structure of the traditional electromagnetic flowmeter makes it restricted in some applications. With the development of medicine, aviation and other fields, people's demand for multiphase flow measurement is increasing. However, the theoretical study of the multi-electrode electromagnetic flowmeter has always lacked systemicity, especially in the relationship between the tube wall, the electrical characteristics of the fluid and the output signal. Based on the existing research, this paper studies several key technologies of multi-electrode electromagnetic flowmeter. The structure of the existing electromagnetic flowmeter is improved, and a multi electrode non insulated pipe wall electromagnetic flow sensor is proposed. According to the equivalent circuit, the influence of the sensor structure on the measurement is analyzed, and the disturbance of the electrical characteristics of the tube wall to the output signal is obtained by combining with the weight function analysis. According to the results of theoretical calculation and analysis, a negative feedback circuit is designed. According to the experimental results, the accuracy and reliability of the novel electromagnetic flowmeter are verified.