文章摘要
张杰,莫润阳.超声相控阵全聚焦成像算法比较分析[J].声学技术,2021,40(1):71~76
超声相控阵全聚焦成像算法比较分析
Comparative analysis of total focusing method in ultrasonic array imaging algorithms
投稿时间:2020-01-13  修订日期:2020-02-20
DOI:10.16300/j.cnki.1000-3630.2021.01.011
中文关键词: 超声相控阵  全矩阵捕获  全聚焦算法  1/2矩阵方法
英文关键词: ultrasonic phased array  full matrix capture (FMC)  total focusing method (TFM)  1/2 matrix technique
基金项目:基金项目(12074238、11474192)
作者单位E-mail
张杰 陕西师范大学超声学重点实验室, 陕西西安 710062  
莫润阳 陕西师范大学超声学重点实验室, 陕西西安 710062 mmrryycn@snnu.edu.cn 
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中文摘要:
      先进的成像算法推动了超声相控阵技术的发展,全聚焦方法(Total Focusing Method,TFM)是一种基于全矩阵捕获的虚拟聚焦后处理及缺陷图像重构算法。文章基于一维线阵相控阵纵波探头全矩阵数据模式,利用Matlab软件结合Field Ⅱ自带开源函数包编写了算法程序,比较了TFM和1/2矩阵方法成像效果并对缺陷分辨率影响因素进行分析,最后用标准试块对算法进行实验验证。仿真结果表明,TFM和1/2矩阵方法都能用于缺陷重构且效果无明显差异,激励脉冲的宽度和频率对图像分辨率影响较大;实验表明,1/2矩阵的成像方法虽可有效降低计算数据量,但同时也丢失了检测区边缘处缺陷的部分信息,因而成像效果较TFM稍差。
英文摘要:
      Advanced imaging algorithms promote the development of ultrasonic phased array technology. Total focusing method (TFM) is a virtual focusing post processing and defect image reconstruction algorithm based on full matrix capture. In this paper, based on the full matrix data mode of one-dimensional linear phased array longitudinal wave probe, the algorithm is programmed by using Matlab software combined with the open source function package of Field Ⅱ. The imaging effects of TFM and 1/2 matrix method are compared, and the influencing factors of defect resolution are analyzed. Finally, the algorithm is verified experimentally with the standard test block. The simulation results show that both TFM and 1/2 matrix method can be used for defect reconstruction without significant difference in effect, and the width and frequency of the excitation pulse have great influence on the image resolution. Experimental results show that the imaging method of 1/2 matrix can effectively reduce the amount of calculated data, but it also loses part of the defect information at the edge of the detection area, and its imaging effect is slightly worse than that of TFM.
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