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| Ultrasonic guided wave phased array pulse compression full focus defect imaging method |
| XU Caibin1, ZUO Hao2, CHEN Yixin2 |
| 1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;
2. Shaanxi Provincial Key Lab of Expressway Construction Machinery, Chang’an University, Xi’an 710064, China |
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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.
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Received: 19 July 2023
Published: 15 June 2024
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