Fatigue crack detection in metallic structures with Lamb waves and 3D laser vibrometry

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Complete noncontact laser ultrasonic imaging for automated crack visualization in a plate (2013, methodology): “For instance, noncontact laser ultrasonic excitation has been achieved by using pulse [7–13] and continuous lasers [14, 15], and ultrasonic sensing has been performed based on laser interferometry [16–20].”
Health monitoring of aerospace composite structures – Active and passive approach (2009, methodology): “In the active approach a three-dimensional (3-D) laser vibrometer, previously used for fatigue crack detection in metallic structures [5], is applied to sense Lamb wave responses and detect delamination in a composite plate.”
Delamination detection in composites through guided wave field image processing (2011, background): “Previous works in this field include detecting fatigue cracks from the variation of ultrasonic amplitude profile [13,14] and using frequency-wavenumber domain filtering to locate scatters in the ultrasonic medium, some of which could be defects [15].”