Journal
ULTRASONICS
Volume 119, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ultras.2021.106595
Keywords
Surface slot; Laser ultrasound; Rayleigh wave; Signal enhancement
Funding
- National Research Foundation (NRF)
- SMRT
- Nanyang Technological University
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The paper presents a non-contact method using ultrasonic Rayleigh waves generated by a pulsed laser to characterize surface slots with large lengths. The length of the slot can be calculated from the time-of-flight information of Rayleigh waves without prior knowledge of its orientation, width or aspect ratio. Both numerical simulations and experiments demonstrate the proposed method showing excellent performance.
Characterization of surface features is essential in many industrial applications, especially for features with large depths, high aspect ratios or under extreme conditions. This work presents a non-contact method to characterize surface slots with large lengths using ultrasonic Rayleigh waves generated by a pulsed laser. A delay-and-sum superposition technique is applied to enhance the signal to noise ratio of transmitted Rayleigh waves. The length of the slot can be calculated from the time-of-flight information of Rayleigh waves without any prior knowledge of its orientation, width or aspect ratio. Both numerical simulations and experiments are conducted to demonstrate the proposed method, showing excellent performance. Furthermore, mode conversion has been studied to understand its impact on the reconstruction accuracy. Given the non-contact feature of the laser ultrasonic technique, the proposed method provides a simple and feasible avenue for the rapid characterisation of normal and angled surface features with high aspect ratio in extreme environments.
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