Fully noncontact measurement of inner cracks in thick specimen with fiber-phased-array laser ultrasonic technique

To realize a fully noncontact ultrasonic testing method for inner cracks inspection in thick metal specimen, a phased array laser ultrasonic testing system with using a compact optic fiber array bundle and a laser interferometer is developed in this study. The focusing and steering of the shear wave...

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Bibliographic Details
Published in:NDT & E international : independent nondestructive testing and evaluation 2020-07, Vol.113, p.102273, Article 102273
Main Authors: Pei, Cuixiang, Yi, Dongchi, Liu, Tianhao, Kou, Xing, Chen, Zhenmao
Format: Article
Language:English
Subjects:
Fiber bundle
Inner cracks
Laser ultrasonic testing
Phased array
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Summary:To realize a fully noncontact ultrasonic testing method for inner cracks inspection in thick metal specimen, a phased array laser ultrasonic testing system with using a compact optic fiber array bundle and a laser interferometer is developed in this study. The focusing and steering of the shear wave and longitudinal wave generated with seven fiber-phased-array laser sources in thermoelastic regime is investigated by a numerical simulation and validated by the experiment. A non-contact measurement of the inner-surface cracks by both the angle-beam testing method and time-of-flight diffraction method with the fiber-phased-array laser ultrasonic technique have been studied.
ISSN:0963-8695
1879-1174
DOI:10.1016/j.ndteint.2020.102273