基于椭圆弧扫描转换的超声波无损检测全聚焦算法

发布时间：2018-03-17 16:23

本文选题：超声相控阵　切入点：无损检测　出处：《电子学报》2017年10期 　论文类型：期刊论文

【摘要】：针对超声波无损检测的全聚焦算法(TFM)处理全矩阵数据耗时巨大的问题,本文基于椭圆弧扫描转换提出了一种单层物体超声波无损检测的新全聚焦算法DEA-TFM.相对于传统全聚焦算法的逆向处理过程,新算法结合计算机光栅图形学中的椭圆绘制算法,解释了全聚焦算法的计算过程实际上是一个正向处理过程;它将结果图像的绘制和生成转化为椭圆弧的扫描转换操作和叠加;同时对原Bresenham椭圆绘制算法进行扩展,提出了绘制二维任意椭圆的改进算法,使新全聚焦算法能够适用于任意形状的相控阵超声波换能器探头.经过仿真实验证明,新算法和传统算法有着相同的运行结果,但是新算法运行速度有一个数量级的提升.
[Abstract]:In order to solve the problem that full focus algorithm (TFM) of ultrasonic nondestructive testing (NDT) processing full matrix data takes a lot of time, In this paper, a new full-focus algorithm DEA-TFMfor ultrasonic nondestructive testing of single-layer objects is proposed based on elliptical arc scanning conversion. Compared with the reverse processing of traditional full-focus algorithm, the new algorithm combines with the ellipse rendering algorithm in computer grating graphics. It is explained that the calculation process of the full focus algorithm is actually a forward processing process, which converts the rendering and generating of the resulting image into the scanning conversion operation and superposition of the elliptical arc, and extends the original Bresenham ellipse rendering algorithm. An improved algorithm for drawing 2-D arbitrary ellipse is proposed, which makes the new full-focus algorithm applicable to the ultrasonic transducer probe of phased array with arbitrary shape. The simulation results show that the new algorithm has the same operation results as the traditional algorithm. But the speed of the new algorithm is improved by an order of magnitude.
【作者单位】：清华大学计算机科学与技术系;
【基金】：教育部博士点基金(No.20130002110002)
【分类号】：TB559;TP391.41

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