超声导波相控阵脉冲压缩全聚焦缺陷成像方法

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摘要针对超声导波缺陷成像中存在的入射信号能量低、缺陷成像分辨率不足等成像质量不高的问题，提出了一种超声导波相控阵脉冲压缩全聚焦缺陷成像方法。首先在长时宽、大带宽线性调频信号激励下，基于超声导波相控阵列逐元激励模式，获取被测结构的全矩阵捕获数据；然后对各响应信号做匹配滤波，对长时宽响应信号波包进行脉冲压缩；接着采用虚拟时间反转法，对脉冲压缩后所得信号进行频散和幅值补偿，以消除大带宽导致的信号相位畸变和因波扩散传播而导致的幅值下降，从而获得无相位畸变的窄时宽信号波包；最后设计了同时包含信号相位和幅值信息的成像指标，进行加权全聚焦成像。在含裂纹、表面缺陷的碳钢板中进行了超声导波缺陷成像实验，结果表明，所提方法可以实现单缺陷/双缺陷的高质量成像。

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	许才彬1
	左浩2
	陈一馨2

关键词 ：超声导波, 缺陷成像, 相控阵, 全聚焦, 脉冲压缩

Abstract：A pulse compression based total focusing method using ultrasonic guided wave phased array for defect imaging was proposed. Firstly, under the excitation of a linear frequency modulation signal with a long duration and a large bandwidth, the full matrix capture data for the tested structure was obtained. Then signals were processed by pulse compression technique to compress the long duration wave packets. Next, the virtual time reversal method was used to compensate the dispersion and amplitude to eliminate the phase distortion caused by the large bandwidth and the amplitude reduction caused by the wave diffusion. In such a way, signals without phase distortion and with narrow durations were obtained. Finally, an imaging index including both phase and amplitude information was designed. Experiments were carried out in carbon steel plate with a crack and two defects and the results show that the proposed method can achieve high quality imaging for both defects.

Key words： ultrasonic guided wave defect imaging phased array total focusing method pulse compression

收稿日期: 2023-07-19 出版日期: 2024-06-15

引用本文:

许才彬1，左浩2，陈一馨2. 超声导波相控阵脉冲压缩全聚焦缺陷成像方法[J]. 振动与冲击, 2024, 43(11): 50-57.
XU Caibin1, ZUO Hao2, CHEN Yixin2. Ultrasonic guided wave phased array pulse compression full focus defect imaging method. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(11): 50-57.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I11/50

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