聚焦超声信号畸变机理及其声显微成像的应用研究

项目名称： 聚焦超声信号畸变机理及其声显微成像的应用研究

项目编号： No.61271403

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 丁锦文

作者单位： 中国科学技术大学

项目金额： 75万元

中文摘要： 本课题以超短脉冲超声显微成像技术激励产生的脉冲聚焦波束为研究对象，针对该波束与材料微观结构交互作用过程中，其纵波、横波信号发生失真的畸变行为展开深入研究。研究的关键在于观测和探究其交互作用时，来自材料内部微观结构的反射或透射原因，造成超声信号在时序及空间构成上微观变化现象，从机理上揭示材料各种微观结构形态与信号畸变的内在联系；探究此类信号畸变在几类超声成像模式里的表现形态及规律；继而对材料内部(亚)微米尺度的结构元素在二维和三维声成像上的甄别，提出一套基于"声信号畸变"方法，与超声成像"时间处置"技术相统一的信号综合分析法，提高超声显微成像技术对块材内部微观结构分析表征的准确度。本课题首次提出超声信号畸变的现象并研究建立超声信号畸变机理的数理模型，丰富和完善超声显微成像理论,探索开发一套用于微观结构的无损检测与评估新表征方法，拓展在材料学科研究和高精密机械工艺等领域的新应用。

中文关键词： 畸变超声信号；超声成像；三维超声成像；散射衍射；扫描超声显微镜

英文摘要： The study is based on the investigated object - focused ultrasound beam of acoustic microscope, starting from ultrasound signals structure and giving deep investigation on the distortion behavior of the acoustic aberrant signal, as a result of the longitudinal and transverse waves generated by the interaction between the focused ultrasound beam and material micro-structures. The core of the subject is to observe and investigate the micro-variation discipline of the reflected or transmitted ultrasound signals formation in the time axis and spatial scales, as the interaction process between the focused ultrasound waves and microstructure of material; To reveal the mechanism of intrinsic relation about various material microstructure and signal distortion; To cognize the discipline about the signal distortion manifestations in several types of acoustical imaging mode; Further, for distinguishing of the material (sub) micron-scale structural features in the two- and three-dimensional acoustical imaging, to provide a set of new analytical characterization method, proposing a signal synthesized analysis mode, which is based on the ultrasound signal distortion analysis and the time-resolved technique in acoustical imaging; To promote the accuracy of the analysis and improve the characterization of acoustic microscopy i

英文关键词： Aberrant acoustic signal；Acoustical imaging；Three-dimensional acoustical imaging；Scattering and diffraction phenomena；Scanning acoustic microscopy