Analysis of eddy-current flowmeters

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Abstract
Coils can induce and detect eddy current in nearby conductors. If the conductor is moving, the eddy currents are carried along with it slightly, and properly designed coils can measure the velocity of the moving conductor with considerable accuracy. Calculations have been made for various axially symmetric arrangements of coils and conductors using a relaxation program for a computer. Experiments have also been made, using mercury as the flowing conductor, with three‐ and five‐coil flowmeters, with good agreement between measured and computed values. For any given arrangement there is an optimum frequency of operation, and different frequencies can give information about the velocity distribution.

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