The Method of Inversion Imaging Based on Matrix Pretreatment and BPT-SIRT Nonlinear Weighted
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摘要: 为提高弹性波CT层析成像中反演成像的质量,同时考虑到CT走时方程中系数矩阵的病态性和BPT-SIRT算法重建图像质量较低的问题,提出基于主元加权预处理和对BPT-SIRT算法加权的方法。该方法对BPT得到的初始迭代值进行加权预处理,在CT走时方程中的系数矩阵主元上叠加一个权值,再通过非线性的指数加权函数对射线路径矩阵中的元素进行加权。通过数值模拟和预制含缺陷的钢管混凝土试件对该方法进行验证,结果表明本文的方法具有更好的收敛速度和精度,对缺陷的识别效果更好。Abstract: In order to improve the quality of the inversion in the elastic wave CT, at the same time, taking into account the pathological characteristics of the coefficient matrix and low quality of the reconstruction image obtained by the BPT-SIRT algorithm, a method based on principal component weighting preprocessing and weighted BPT-SIRT algorithm is proposed. The initial iterative value obtained by the method of BPT is weighted, then, adding a weight to the principal component of the coefficient matrix, the element of ray matrix is weighted by the nonlinear exponential weighting function. The method is verified by numerical simulation and concrete filled steel tube specimens with defects. The results show that the method has better convergence speed and accuracy, and the recognition effect is better.
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Keywords:
- morbidity /
- principal component weighting /
- pretreatment /
- inversion imaging
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期刊类型引用(3)
1. 杨国梁. 跨孔电磁波CT及剪切波测试方法在岩溶地质勘探中的应用. 江苏建筑. 2022(06): 126-130+143 . 百度学术
2. 陶鹏飞,尹奇峰,赵红飞,潘冬明,郝晋荣. 井中地震波CT浅层城市地下空间成像. 地下空间与工程学报. 2019(S2): 687-693 . 百度学术
3. 郭秀芹,杨森,张远军. 弹性波CT技术在大体积混凝土结构无损检测中的应用. 四川理工学院学报(自然科学版). 2017(04): 58-63 . 百度学术
其他类型引用(3)
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