Abstract
In this paper, completely noncontact and nondestructive testing and imaging of internal defects in thick metal with a modified combination of laser ultrasonic testing (LUT) and the synthetic aperture focusing technique (SAFT) is studied. Strong ultrasonic plane wave generated by a high-power and unfocused laser source irradiate on a sample surface with a constraint and transparent layer is proposed for the new laser-ultrasonic SAFT. In order to enhance the imaging accuracy, the algorithm based on the signal correlation is applied for the laser-ultrasonic SAFT imaging. The detection capability and imaging performance of defects is verified by an experiment validation.
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