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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摘要构建了一个激光激励和激光多普勒扫描拾振的完全非接触式超声导波损伤检测实验平台，实现对结构中超声导波场的高分辨率拾取，克服了常规接触式导波换能器致使波场检测空间分辨率低等不足；提出分频段时域滤波的方法，将激光超声宽频带信号分解为多个窄带信号以抑制频散效应，进而在无基准信号的前提下实现对损伤信号的提取；在此基础上应用频率波数域逆时损伤成像方法重构入射波场及损伤散射波场，以确定损伤边界，进而综合各窄带信号的损伤成像结果以获得更为精确的成像。仿真和实验结果表明：结合小波分析分频段时域滤波法与频率波数域逆时损伤成像方法能够实现各向同性板状结构中损伤的非接触检测，在工程实践上具有更广的应用价值。

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	骆英
	陈力
	徐晨光
	许伯强

关键词 ：激光超声, 小波分析, 超声导波, 频率波数域逆时损伤成像, 无损检测

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

收稿日期: 2018-01-29 出版日期: 2019-06-28

引用本文:

骆英，陈力，徐晨光，许伯强. 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[J]. 振动与冲击, 2019, 38(13): 87-94.
LUO Ying,CHEN Li,XU Chenguang,XU Boqiang. Time-reversal damage imaging in f-k domain method based on laser ultrasonic guide wave time-domain filtering in multi-band. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(13): 87-94.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I13/87

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