Laser detection of elastic waves diffraction by the crack鈥檚 edge
- 作者：A.B. Rinkevich ; rin@imp.uran.ru ; D.V. Perov peroff@imp.uran.ru ; Yu V. Korkh julia@imp.uran.ru
- 关键词：Diffraction of ultrasound ; Laser Doppler interferometer ; Crack&rsquo ; s edge
- 刊名：Applied Acoustics
- 出版年：2012
- 期刊代码：12_0003682x
- 类别：et
- 出版时间：August, 2012
- 卷：73
- 期：8
- 页码：803-808
- 文件大小：1225 K
摘要
Diffraction effects and features of acoustic wave propagation in elastic media with the surface-breaking microcrack were investigated in detail for the pulse probing signals. The crack鈥檚 plane was oriented along the direction of longitudinal ultrasonic wave incidence in such a way that the detection of the crack with such an unfavorable spatial location was difficult by means of traditional acoustic techniques. Using laser Doppler interferometer a set of instantaneous pictures of acoustic field on the specimen鈥檚 surface, corresponding to the different moments of time was obtained. This allowed us to investigate and visualize the diffraction effects of acoustic field in dynamics. Using numerical modeling of diffraction processes of acoustic waves on the crack鈥檚 edge and top for pulse signals the origin of V-like structures on the snapshots of acoustic fields was explained and analyzed.