Research On Electromagnetic Flowmeter Based On Correlation Technology

Electromagnetic flowmeter, which is based on Faraday's Induction Low, is widely used for the measurement of flowrate of conductive fluid in pipes. It can work well when fluid's flowrate is above 0.1-0.2m/s, but when it works below the range, great error will be occurred. So the application of electromagnetic flowmeter has been narrowed. By making deeper research, we can know that the error is connected with electromagnetic's anti-jamming capability tightly, especially the disturbance from sensor and it's inner circuit, which are hard to be got rid of. Fortunately, cross- correlation technology offers a good solution with excellence anti-jamming capability.Based on the conceptions mentioned above, a correlation electromagnetic flowmeter is developed, which adopted the technology. In the thesis followed works are mentioned:1) The history and status of electromagnetic flowmeter are summarized, at the same time its theory and developed production are introduced in detail;2) In the article, an innovated method is presented: putting cross-correlation technology into the electromagnetic flowmeter;3) The article successfully developed an electromagnetic flowmeter based on cross-correlation technology. Additionally, the capability of correlation unit is analyzed, which guided the design of the hardware of correlation electromagnetic flowmeter;4) The article gives a thorough test under laboratory condition on the cross-correlation electromagnetic flowmeter, and a conclusion is drew: the performance of correlation electromagnetic flowmeter is much better than that of non-correlation electromagnetic flowmeter.