| 摘要 |
PURPOSE:To execute stably a flaw inspection without being influenced by the vibration of a material to be inspected by placing the material to be inspected between a generating coil and a detecting coil opposed to each other. CONSTITUTION:A trasducer 7 is provided with an electromagnet 6 consisting of a core 5 and a coil 4, a generating coil 13 placed in one end face of a gap part of the core 5 and a detecting coil 14 placed in the other end face. Also, the coils 13, 14 are opposed to each by holding an interval L and a material to be inspected 1 is placed between them. In this state, when an exciting power source 8 and a pulser 9 are controlled by a flaw detector 11 and a vertical magnetic field B is applied to the material to be inspected from the electromagnet 6 and also an impulsive AC current is supplied to the coil 13, a plate wave 2 is generated in the material to be inspected 1. In this case, the plate wave 2 is generated by the same form on the surface and the reverse side of the material to be inspected 1, therefore, a plate wave echo from a defect is also generated on the surface and the reverse side of the material to be inspected 1 and the plate wave 2 containing an echo by the defect can be detected by the coil 14 placed in the lower face side of the material to be inspected 1.
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