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Ultrasonic guided wave focusing by a generalized phased array |
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| Authors: | Bixing Zhang Fuli Xie Hefeng Dong Junjie Gong |
| Affiliation: | 1. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, China 2. Department of Electronics and Telecommunications, Norwegian University of Science and Technology, Trondheim, NO-7491, Norway 3. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, China |
| Abstract: | Ultrasonic guided wave focusing by a generalized phased array is studied based on dispersion curves in a multi-layered medium. The different phase of the guided waves with different frequency is added on the excitation signal on each element of the transducer array for focusing. This can be realized by designing a proper excitation pulse based on the dispersion curves of the guided waves for each of the transducer array elements. The numerical simulation results show that the guided waves with different modes, different frequency components, and from different elements of the transducer array can all be focused at the target and focusing is achieved. |
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