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

An adaptive laser ultrasound system using optical two-wave mixing technique with photorefractive quantum wells is developed for crack characterization in noisy environments. Al Ga As ∕ Ga As photorefractive multiple quantum wells featuring a quick response time of 9.1 μ s cancel disturbances below 1...

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Bibliographic Details
Published in:Applied physics letters 2006-10, Vol.89 (17), p.171902-171902-3
Main Authors: Matsuda, Youichi, Nakano, Hidetoshi, Nagai, Satoshi, Hiratsuka, Hajime
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Summary:An adaptive laser ultrasound system using optical two-wave mixing technique with photorefractive quantum wells is developed for crack characterization in noisy environments. Al Ga As ∕ Ga As photorefractive multiple quantum wells featuring a quick response time of 9.1 μ s 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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2364579