Abstract
Materials are often characterized by measuring the velocity and attenuation of ultrasonic waves. Laser-ultrasonics, which uses lasers for generation and detection of ultrasound, has several advantages compared to the classical piezoelectric techniques, but the use of lasers is often associated with ill-defined source and receiver characteristics making diffraction effects hard to evaluate. We have identified two regimes which, in practice, allow the measurement of velocity and attenuation: the point source/point receiver and the large uniform source/large uniform receiver regimes. These approaches are discussed and illustrated with several examples of application. Limitations caused by misalignment between the generating and detecting laser spots are also analyzed.
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Monchalin, J.P., Aussel, J.D. Ultrasonic velocity and attenuation determination by laser-ultrasonics. J Nondestruct Eval 9, 211–221 (1990). https://doi.org/10.1007/BF00565639
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DOI: https://doi.org/10.1007/BF00565639