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
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.
. [J]. 中国物理快报, 2020, 37(6): 64301-.
Jian Li, Hong-Juan Yang, Jun Ma, Xiang Gao, Jun-Hong Li, Jian-Zheng Cheng, Wen Wang, Cheng-Hao Wang. Detection and Location of a Target in Layered Media without Prior Knowledge of Medium Parameters *. Chin. Phys. Lett., 2020, 37(6): 64301-.
Yang H J, Li J, Ma J, Li J H, Wang W and Wang C H 2019 Proceeding of 14th IEEE Symposium on Piezoelectrcity, Acoustic Waves, and Device Applications (Shijiazhuang, China 1–4 November 2019) p 1
[17]
Brekhovskikh L M 1980 Waves in Layered Media 2nd edn (New York: Academic Press) chap 4 p 225
2020, Vol. 37 
