混凝土超声波成像中两种算法的成像效果分析

Imaging Effect Analysis of Two Kinds of Algorithms in Ultrasonic Tomography of Concrete

采用弯曲射线追踪算法计算走时,分别用最小二乘QR分解算法与代数重建技术就恰定方程组、超定方程组与欠定方程组进行了成像计算.结果表明:对恰定方程组与超定方程组,两种算法均可得到良好的重建图像;对欠定方程组,两种算法的重建图像均难于正确反映尺度较小的异常体.

Bending ray tracing technique is used to calculate the minimum travel time. LSQR and ART algorithms are applied separately to calculate tomography for the determined system of equation, overdetermined system of equation and underdetermined system of equation. The results show： two kinds of algorithms both can obtain accurate reconstructing tomography for determined system of equation and overdetermined system of equation. As for underdetermined system of equation, reconstructing tomography of LSQR and ART algorithms cannot accurately show smaller abnormal body.