Application of High-amplitude Ultrasound for Non- Destructive Evaluation
نویسندگان
چکیده
High-amplitude ultrasound (u0 > 100 nm) generated by pulsed laser material processing carries important information about the mechanisms of light-material interaction and the propagation of the wave within the work-piece. In addition, it can also be applied for the purpose of non-destructive evaluation of the sample. The propagation of high-amplitude ultrasonic waves inside a plate is measured with an improved interferometric method and compared with standard PID-controlled stabilized interferometer. The improved method is based on the quadrature detection of two orthogonally polarized laser beams. It has a constant sensitivity which enables measurement of high-amplitude ultrasonic waves as well as monitoring of ultrasonic waves superimposed on the translatory movement of the object. An application of high-amplitude ultrasound for non-destructive evaluation is demonstrated. A comparison between non-destructive evaluations based on lowand high-amplitude laser generated ultrasound is also performed using both interferometric methods. Advantages of the improved detection method of high-amplitude ultrasound are additionally discussed.
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