Observation of Two-Dimensional Spatial Distribution of Plane Crack Tips With Low-Power Pulsed Laser
We propose a simple and comparatively high spatial resolution method to nondestructively detect small plane cracks in solid materials. In this method, we used two techniques, a two-layered self-made transducer and low-power laser pulses. The two-layered transducer has two roles, it transmits lowfrequency, high-amplitude longitudinal waves from a PZT transducer and it is a wideband receiver made of PVDF film. The low-frequency excitation causes the fluctuation of cracks. Combining these techniques, we succeeded in detecting plane crack tips and presenting them as two-dimensional images.
Key wordsPlane crack tips Low-power pulsed laser Two-layered transducer Two-dimensional mapping
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