Advanced 3 Phase Magnetic Sensor and Its Application to Defect Visualization of Thin Metallic Materials

概要

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This paper proposes a three phase magnetic sensing system which makes it possible to detect the defect, bending and deflection of metallic plate. Operating principle of this system is based on the essential nature of three phase transformer circuit. When balanced three phase currents are fed into the primary coils which work as the sensing part, zero phase voltage is detected if the target, i.e. secondary circuits have defects. Zero phase voltage is not detected if the target has no defects. Distribution of these zero phase voltages visualize the defect, bending and deflection of the metallic materials.
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