金属表面裂纹脉冲压缩增强型激光超声检测方法研究

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摘要为了提高激光超声技术检测能力，本文提出了一种基于脉冲压缩的增强型激光超声检测方法,并将其用于金属表面裂纹检测。该方法结合激光束空间分布调控技术，激发线性调频超声表面波信号，进一步利用匹配滤波算法对线性调频激光超声表面波信号进行脉冲压缩，可大幅度提高激光超声检测信号的信噪比和分辨率。首先，建立空间调制激光超声数值计算模型，研究线性调频激光超声信号激励方法；然后,基于数值模拟获得的线性调频激光超声检测信号，开发基于匹配滤波器的激光超声脉冲压缩信号处理方法；通过数值模拟不同表面裂纹缺陷与不同空间调制情况下的脉冲压缩信号效果，探究该方法对于激光超声检测信号信噪比的增强能力，并最终通过实验验证。结论表明：基于脉冲压缩技术的增强型激光超声检测方法，可以大幅度抑制噪声信号，提高针对金属表面裂纹的缺陷检测能力，解决激光超声无损检测信噪比低，灵敏度差的问题，也为该方法进一步研究提供理论依据和实验指导。

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	韩峰1
	王春梅2
	寇兴3
	吴小雨3
	裴翠祥3

关键词 ：激光超声, 脉冲压缩, 表面裂纹

Abstract：In order to improve the detecting ability of the laser ultrasonic testing technology, an enhanced laser ultrasonic testing method based on pulse compression is proposed for metal surface crack inspection. With using a space-modulated laser beam, a linear frequency modulation ultrasonic Rayleigh wave is generated. The signal-to-noise ratio and resolution of laser ultrasonic testing signal can be greatly improved by pulse compression of linear frequency modulation laser ultrasonic surface wave signal by matched filtering algorithm. A numerical simulation model of spatial modulated laser ultrasound is established, to study the excitation of chirp laser ultrasonic signals. Then, based on the chirp laser ultrasonic signal obtained by numerical simulation, a laser ultrasonic pulse compression signal processing method based on matched filter is developed. The enhancement of signal-to-noise ratio (SNR) of laser ultrasonic testing is investigated by simulating the effect of pulse compression under different defects and spatial modulation. The results show that the enhanced laser ultrasonic testing method based on pulse compression technique can suppress noise signal greatly, improve the ability of surface defect detection, solve the problem of low signal-to-noise ratio and poor sensitivity in laser ultrasound, it also can provide theoretical basis and experimental instruction for the further research of this method.

Key words： Laser Ultrasound Chirp pulse compression Surface crack

收稿日期: 2021-12-27 出版日期: 2023-03-15

引用本文:

韩峰1，王春梅2，寇兴3, 吴小雨3，裴翠祥3. 金属表面裂纹脉冲压缩增强型激光超声检测方法研究[J]. 振动与冲击, 2023, 42(5): 160-165.
HAN Feng1， WANG Chunmei2， KOU Xing3， WU Xiaoyu3， PEI Cuixiang3. Pulse compression enhanced laser ultrasonic detection method for metal surface cracks. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(5): 160-165.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I5/160

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