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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.
Ultrasound CT imaging technique is a good method to detect internal defects in concrete. Snell’s law is used to correct the image to establish a concrete model - rectangle (0.4m × 0.5m) with low-speed anomalous area. By dividing different grids, And compares the path conditions of the direct ray tracing, the primary ray tracing and the secondary ray tracing of the two grid models, and obtains the most suitable inversion grid number by analyzing the error. The research shows that when using the left and right detection methods, If the level of division is the same as the number of vertical grids, the number of grids for the most appropriate inversion should be chosen as follows: 290 / Number of grids that are orthogonally reproduced This is best proved by the inversion of algebraic reconstruction (ART) Conclusion, and the second ray tracing the smallest error, the effect of inversion is closest to the real situation of the model, more accurately reflect the internal defects of the concrete model, indicating that the mesh division of the CT imaging accuracy or not have a great influences.