Investigation of planar coil for eddy current conductivity measurements in wide frequency range

Martin Parker, Andrei Pokatilov, Toomas Kübarsepp, Olev Märtens, Andrei Kolyshkin

Abstract

Several planar coil designs have been investigated for the application in accurate AC conductivity measurements in the wide frequency range. The measurement method is based on the eddy-current probe-coils solutions proposed by Dodd and Deeds. The coil parameters affecting the performance of the model in the specified frequency range from 30 kHz to 720 kHz have been investigated.<br />Different designs have been used including coils on a printed circuit board (PCB), coils on a flexible substrate and on-site manufactured coils winded from a copper wire. The goal was to reach the inductance of the different coils to match the best-accuracy of the measuring instrument. Amongst the others, the important factor was to keep the diameter of the coils suitable for the practical applications.

Keywords

conductivity, impedance, eddy-current, measurement, planar coil

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IMEKO-TC4-2013-017.pdf

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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