The Laser ultrasonic technique (LUT) is an interesting method to perform inspection of large aeronautical panels of complex shapes. Its non-contact feature avoids coupling problems and could improve the efficiency of the NDT inspection in the composite manufacturing industry. If the ultrasound generation process is well understood in metallic samples, the application of the technique in composite parts is more complex. Semi-analytical and numerical models are implemented to describe the ultrasonic generation in metallic and composites materials. A detailed description of the ultrasonic source due to the laser radiation absorption in the material is provided according to suitable parameters.
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