Differential two-wave mixing interferometer for crack detection in metallic structures based on laser-induced ultrasound
Optics and Lasers in Engineering(2023)
Abstract
•Differential processing is adopted to improve the detection sensitivity and the signal to noise ratio.•The phase, amplitude and frequency of the measured laser-induced ultrasound signal can be obtained in-line.•The ultrasound is non-contacted generated and distant detected to characterize the cracks in metallic structures.
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Key words
Differential two-wave mixing,Detection sensitivity,Laser-induced ultrasound,Crack detection,Noise suppression
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