How to Measure Flow with Magnets - (Magnetic Flow Meters)

What happens when a civil engineer mixes water and electricity? The results arent always ideal, but you always learn something!\r
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A magnetic flow meter relies on Faradays Law of Induction to measure the flow of a fluid. Magnets outside the pipe create a magnetic field. Electrodes are located perpendicular to the magnets. A conductive fluid moving through the pipe will generate a voltage (electromotive force) between the electrodes due to Faradays law. The faster the fluid moves through the pipe, the higher the voltage. Once you know the velocity of the fluid, you can calculate flow using the cross sectional area of the pipe. In this video, I walk through some of the details that electrical engineers have worked out so that this ingenious device can work properly. Unfortunately I couldnt get it working very well myself!\r
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Errata:\r
-At 4:36, the signal to noise ratio is low, not high.