网格划分对混凝土超声波CT成像的影响

发布时间：2018-02-22 19:29

本文关键词： 混凝土超声波 CT 代数重建技术(ART) Snell　出处：《武汉大学学报(工学版)》2017年05期 　论文类型：期刊论文

【摘要】：超声波CT成像技术是一种较好的检测混凝土内部缺陷的方法,采用Snell定律修正图像,建立一种低速异常区域的混凝土模型——矩形(0.4m×0.5m),通过划分不同的网格,并比较两种网格模型的直射线追踪、一次射线追踪、二次射线追踪的路径情况,通过分析误差得出最合适的反演网格数.研究表明,当采用左右检测方式时,在正演划分的水平和竖直网格数相等的情况下,最合适的反演的网格数应选择:290/正演网格数.代数重建技术(ART)反演情况较好地印证了这个结论,且二次射线追踪的误差最小,反演的效果最为接近模型的真实情况,较为精确地反映了混凝土模型的内部缺陷情况,表明网格的划分合适与否对CT成像的精度有很大影响.
[Abstract]:Ultrasonic CT imaging technique is a good method to detect the inner defects of concrete. Using Snell's law to correct the image, a concrete model of low speed anomaly region is established, which is 0.4m 脳 0.5mg of rectangle, and different meshes are divided. By comparing the direct ray tracing, the primary ray tracing and the secondary ray tracing path of the two grid models, the most suitable inversion mesh number is obtained by analyzing the error. The results show that, when the left and right detection methods are used, When the level of forward division and the number of vertical meshes are equal, the most suitable mesh number for inversion should be: 290 / forward mesh number. The inversion results of algebraic reconstruction technique (ART) confirm this conclusion well, and the error of secondary ray tracing is the least. The effect of inversion is the closest to the real situation of the model, which accurately reflects the internal defects of the concrete model, and shows that whether the mesh is appropriate or not has a great influence on the accuracy of CT imaging.
【作者单位】：湘潭大学材料科学与工程学院;
【分类号】：TU528

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