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What is the principle of electrical conductivity testing?

April 26, 2017conductivity electrical Engineering Mathematics Principle Testing

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What is the principle of electrical conductivity testing?

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The scientific principle is that of electromagnetic induction and eddy currents. An alternating electromagnetic field is generated in the probe. When the probe is placed on the surface of a conductive material, eddy currents are induced in the material. These eddy currents oppose the magnetic field initially created in the probe. The opposing field changes the strength of the magnetic field and the phase angle. These changes are measured and are an indication of conductivity as well as other properties.