激光超声导波分频段时域滤波及频率波数域逆时损伤成像

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Abstract A fully non-contact laser ultrasonic wave damage detection test platform was built using laser excitation and the scanning laser Doppler vibrometry (SLDV) to realize high resolution pickup of ultrosonic guided wave field in structures, and overcome shortcomings of conventional contact guided wave transducors causing low spatial resolution of wave detection. The wavelet analysis time domain filtering in multi-band method was proposed to decompose a laser ultrosonic wide frequency band signal into several narrow band ones for suppressing dispersion effect, and realize extracting damage signal without reference signal. Then the time-reveral damage imaging in f-k domain method was used to reconstruct incident wave field and damage scattering wave one, and determine the damage boundary. Furthermore, damage imaging results of various narrow band signals were synthesized to acquire more accurate images. Numerical simulation and test results showed that the wavelet analysis time domain filtering in multi-band method combined with the time-reveral damage imaging in f-k domain one can realize damage noncantact detection in isotropic plate structures, and is more valuable for application in engineering practice.

Key words： Laser ultrasonic Wavelet analysis Ultrasonic guide wave f-k Time Reversal Method Nondestructive testing

Received: 29 January 2018 Published: 28 June 2019

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	Articles by authors
	LUO Ying
	CHEN Li
	XU Chenguang
	XU Boqiang

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LUO Ying,CHEN Li,XU Chenguang, et al. Time-reversal damage imaging in f-k domain method based on laser ultrasonic guide wave time-domain filtering in multi-band[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(13): 87-94.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I13/87

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