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Inside the non-linear ultra wave which features that microscopic crack
Inside the non-linear ultra wave which features that microscopic crack
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机译：带有细微裂纹的非线性超声波内部
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摘要
PROBLEM TO BE SOLVED: To provide an internal microscopic cracking detection method using a non-linear ultrasonic wave which achieves a non-destructive evaluation of the joint strength in the interface of a solid and the soundness thereof under microscopic peeling, cracking and the like existing inside the solid and in the interface thereof using an ultrasonic wave with the incident amplitude thereof equivalent to the degree of aperture of them. ;SOLUTION: In the internal microscopic cracking detection method, a burst ultrasonic wave is admitted aslant or vertically into a joint surface of a solid and the waveform of the wave transmitted through the interface or the wave reflected thereon is digitally recorded. The distortion in the waveform of the transmission or reflected wave with respect to the waveform of the incident wave and a high harmonic amplitude associated therewith are digitally detected to detect internal microscopic cracking existing inside an object.;COPYRIGHT: (C)2001,JPO
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