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Surface breaking crack evaluation with photorefractive quantum wells and laser-generated Rayleigh waves

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4 Author(s)
Matsuda, Youichi ; National Metrology Institute of Japan (NMIJ), AIST, Central 3, Tsukuba, 305-8563, Japan ; Nakano, Hidetoshi ; Nagai, Satoshi ; Hiratsuka, Hajime

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An adaptive laser ultrasound system using optical two-wave mixing technique with photorefractive quantum wells is developed for crack characterization in noisy environments. AlGaAs/GaAs photorefractive multiple quantum wells featuring a quick response time of 9.1 μs cancel disturbances below 100 kHz. A laser-generated Rayleigh wave in a thermoelastic regime is used for crack characterization. The positions and depths of artificial cracks, 3 and 5 mm in depth and 0.2 mm in width, were evaluated. The crack orientations were also determined using a shear wave that was generated through mode conversion of a Rayleigh wave at the crack tip.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 17 )

Date of Publication:

Oct 2006

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