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Application laser ultrasound imaging technology for detecting defect based on Hilbert transform

Lookup NU author(s): Professor Gui Yun TianORCiD

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Abstract

This paper describes a method of laser ultrasonic propagation imaging based on Hilbert transform. The ultrasonic signals are excited by pulsed laser on the measured material surface. Then ultrasonic signal is transformed by Hilbert transfrom. and time-domain waveforms of analyzed measured ultrasonic signal propagation. Finally, ultrasonic signal propagation in the material is displayed by ultrasound imaging technology. The experimental results show that taking the ultrasonic signal Hilbert transform method can not only effectively extract the ultrasonic signal propagation at the defect, but also the shape, size and distribution of surface defects can be intuitive, efficiently detected by ultrasonic propagation imaging. Hence, the Hilbert-transform ultrasonic propagation imaging technology provides a method for quantitative detection of defects in manufacturing.

Publication metadata

Author(s): Zeng W, Wang H, Tian G, Fang L, Wang W

Publication type: Article

Publication status: Published

Journal: Zhongguo Jiguang/Chinese Journal of Lasers

Year: 2014

Volume: 41

Issue: 5

Print publication date: 01/05/2014

Acceptance date: 01/01/1900

ISSN (print): 0258-7025

Publisher: Science Press

URL: https://doi.org/10.3788/CJL201441.0508004

DOI: 10.3788/CJL201441.0508004

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