1Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190 2University of Chinese Academy of Sciences, Beijing 100049 3School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200 4State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190 5College of Mechanical Engineering and Application Electronics Technology, Beijing University of Technology, Beijing 100124
Abstract：A target in layered medium can be located by the ridge-like distribution time reversal and reverse time migration (TR-RTM) mixed method. However, this method cannot distinguish between acoustic field distributions of the interface and target for the wider acoustic pulse signals, which may result in inaccurate location of the target. A snapshot TR-RTM mixed method is proposed to solve this problem. The principle of snapshot TR-RTM mixed method is first given. Experiments are then carried out, and a mountain-like acoustic field distribution is obtained by processing experimental data. The results show that the location of the peak is that of the target, and the ratio of the scattered signal and interface reflection signal (signal-to-interference ratio) is improved by about four times after processing. Furthermore, this method can effectively suppress the interface reflection signal and enhance the target scattering signal. Therefore, it can achieve effective detection and location of a target in a layered medium.
. [J]. 中国物理快报, 2019, 36(11): 114301-.
Hong-Juan Yang, Jian Li, Xiang Gao, Jun Ma, Jun-Hong Li, Wen Wang, Cheng-Hao Wang. Detection and Location of a Target in Layered Media by Snapshot Time Reversal and Reverse Time Migration Mixed Method. Chin. Phys. Lett., 2019, 36(11): 114301-.
Gao X, Li J, Shi F, Ma J, Wang W and Wang C 2017 Chin. J. Acoust.36 385
[9]
Morse P M 1948 Vibration And Sound (New York: McGraw-Hill) chap 7 p 343
[10]
Brekhovskikh L M 1980 Waves In Layered Media (New York: Academic Press) chap 4 p 225
[11]
Zheng J L, Ying Q H and Yang L 1981 Signals and Systems (Beijing: Higher Education Press) chap 3 p 207 (in Chinese)
[12]
Gao X, Li J, Ma J, Shi F, Wang W and Wang C 2017 Proceeding of IEEE Symposium on Piezoelectricity, Acoustic Waves and Device Applications (Chengdu, China 27–30 October 2017) p 393
2019, Vol. 36 
