| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Detection and Location of a Target in Layered Media without Prior Knowledge of Medium Parameters |
| Jian Li1,2†**, Hong-Juan Yang3,4†, Jun Ma3, Xiang Gao5, Jun-Hong Li3, Jian-Zheng Cheng1, Wen Wang3, Cheng-Hao Wang3,4** |
1School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China
2State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
3Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
4University of Chinese Academy of Sciences, Beijing 100049, China
5College of Mechanical Engineering and Application Electronics Technology, Beijing University of Technology, Beijing 100124, China
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| Cite this article: |
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Jian Li, Hong-Juan Yang, Jun Ma et al 2020 Chin. Phys. Lett. 37 064301 |
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Abstract Without prior knowledge of medium parameters, a method is proposed to detect and locate a target in layered media. Experiments were carried out for liquid/liquid and solid/liquid layered media, and the location of a target in them was obtained using three methods combined, i.e., the least-square method, the method of finding minimum dispersal degree of target distribution, and the snapshot time reversal and reverse time migration mixed method. The medium parameters, i.e., the acoustic velocities of upper and lower media as well as the thickness of the upper medium, were inversed simultaneously. The results show that the position of target is consistent with its actual position. Thus, the detection and location of a target in layered media are achieved without prior knowledge of medium parameters, and it overcomes the difficulty that the common time reversal method only detects the target, but cannot locate it.
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Received: 19 January 2020
Published: 26 May 2020
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| PACS: |
43.20.+g
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(General linear acoustics)
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43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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43.60.+d
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(Acoustic signal processing)
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| Fund: *Supported by the Key Research Program of the Chinese Academy of Sciences (Grant No. QYZDY-SSW-JSC007), the National Natural Science Foundation of China (Grant No. 11804256), and the State Key Laboratory of Acoustics, Chinese Academy of Sciences (Grant No. SKLA201807). |
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