Study on the Dual-Frequency Excited Electromagnetic Flowmeter

A time-division dual-frequency excitation scheme was proposed as an improvement to the traditional electromagnetic flowmeters. The proposed scheme keeps the advantage of zero-point stability of the traditional design, the immunity to low frequency noise is enhanced, and the response to fast change of fluid velocity is improved. A prototype flowmeter was made based on the proposed design, experiment results show that the prototype flowmeter can measure water flow in a wide velocity range with satisfactory accuracy.