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ECT (eddy current testing) is extensively used to inspect such as elevator, escalator, and airplane, nuclear electric and power plant without any destructive testing. This paper proposes a resonance type ECT sensor system which makes it possible to detect the defect of metallic plate with high reliability. Operating principle of this system is based on essential nature of parallel resonant electrical circuit. When the primary coil is working as a sensing part and the secondary coil, i.e. a target metallic material, is magnetically coupled with the primary coil, the resonant frequency and impedance of the ECT sensor system greatly depend on the secondary impedance change cased by a defect such as cracks. By means of this resonance type ECT sensor system, we have visualized the defects of plane metallic materials as a demonstrative example revealing its usefulness.

Fault Visualization in Metallic Materials by Resonance Type ECT Sensor