摘要
本文建立了一个可对几十微米厚的层状介质进行声阻抗图重建的算法,并通过计算机仿真实验,验证了算法的有效性。作者在建立算法过程中,考察并比较了两种解卷方法的效果:即维纳滤波和相关检测方法。为提高系统的分辨率和重建精度,本文建立并采用了动态阈值式峰值检测法,收到了良好效果。仿真实验结果表明,该算法不仅适用于十几兆赫芝的高频情况,且其纵向分辨率可达48μm。
A reconstruction algorithm of layered acoustic impedance profile has been established in this work. The thickness of the multi-layer medium to be reconstructed can be less than 50μm. The validity of the algorithm has been proved by computer simulation experiment results. In this paper, two deconvolution methods have been adopted and compared. One of them is called Wiener filtering and the other is called correlation method. To improve the resolution and the precision of the reconstruction, an after deconvolution processing method, namely, the moving threshold peak detection technique has been established. The simulation results also show that this impedance reconstruction algorithm can be performed in a high frequency situation (up to 18MHz) and the 48μm axial resoluton has been obtained.
出处
《电子学报》
EI
CAS
CSCD
北大核心
1992年第1期9-15,共7页
Acta Electronica Sinica
基金
国家自然科学基金资助课题
关键词
分层介质
声阻抗图
重建算法
仿真
Layered medium, Acoustic impedance reconstructiou algorithm, Deconvolution, Simulation experiment. High resolution.
