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超声水平剪切(shear horizontal,SH)导波成像检测旨在解决平板检测中检测距离增加时分辨力降低的问题。该文运用合成孔径聚焦原理,构建了16通道超声SH导波成像检测实验系统,通过分析阵列信号时频域特征揭示了声波与缺陷间相互作用的规律,对SH导波合成孔径聚焦成像算法进行了讨论,阐明了导波阵列信号时空域信息合成在聚焦成像中的应用。研究结果表明:合成孔径聚焦可用于超声SH导波成像检测,所成图像能够表征钢板中检测距离2 m以上、尺寸当量大于5 mm的缺陷信息,为深入开展工业在役大尺度结构板材的缺陷成像检测和结构健康监测提供了基础。
Ultrasound horizontal shear (SH) guided-wave imaging detection aims to solve the problem of reduced resolution when the detection distance increases in flat panel detection. In this paper, an experimental system of 16-channel ultrasonic SH guided wave imaging is constructed by using the principle of synthetic aperture focusing. By analyzing the characteristics of the time-frequency domain of array signals, the interaction between sound waves and defects is revealed. The SH-guided synthetic aperture focusing imaging algorithm The discussion and clarification of the guidance wave array signal space-time information synthesis in the application of focus imaging. The results show that synthetic aperture focusing can be used for ultrasonic guided wave guided imaging. The image can characterize the defect information of steel plate with the detection distance of more than 2 m and the dimension equivalent of more than 5 mm. In order to further develop the defects of industrial large-scale structural plates Imaging testing and structural health monitoring provide the basis.