Non-linear enhancement of laser generated ultrasonic Rayleigh waves by cracks

@inproceedings{Dixon2008NonlinearEO,
  title={Non-linear enhancement of laser generated ultrasonic Rayleigh waves by cracks},
  author={Sean T. Dixon and Brett Cann and Donna L. Carroll and Yichao Fan and Rebecca Susan Edwards},
  year={2008}
}
Laser generated ultrasound has been widely used for detecting cracks, surface and sub-surface defects in many different materials. It provides a non-contact wideband excitation source which can be focused into different geometries. Previous workers have reported enhancement of the laser generated Rayleigh wave when a crack is illuminated by pulsed laser beam irradiation. We demonstrate that the enhancement observed is due to a combination of source truncation, the free boundary condition at… CONTINUE READING

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