基于混凝土超声探伤的CT图像分析
|
摘要
利用超声波CT(Computerized Tomography)探伤技术,对含预埋缺陷的混凝土构件进行探测,采集走时数据重建波速分布—“反演成像”。实验结果表明,超声CT图像可以比较完整地反映某一断面上混凝土的内部质量,从而根据速度差异识别缺陷。并通过分析成像结果,对影响CT图像质量的主要因素:测线的布置、成像单元的划分、反演方法的选择,进行了初步研究和评价。
Based on ultrasonic CT for concrete defects detection,concrete specimen with defects was examined.The travel times data obtained reconstructed a tomograph of velocity across the section.Experimental results indicated ultrasonic CT images can reflect the condition of internal concrete structures depending on the change of velocity,which allowed better identification of defects within the body of structures.Meanwhile,key factors(layout of test lines,division of imaging cells,choice of inverse methods) influencing on the accuracy of CT images were researched and evaluated by the analysis of imaging results.
Based on ultrasonic CT for concrete defects detection,concrete specimen with defects was examined.The travel times data obtained reconstructed a tomograph of velocity across the section.Experimental results indicated ultrasonic CT images can reflect the condition of internal concrete structures depending on the change of velocity,which allowed better identification of defects within the body of structures.Meanwhile,key factors(layout of test lines,division of imaging cells,choice of inverse methods) influencing on the accuracy of CT images were researched and evaluated by the analysis of imaging results.
引文
[1]林维正.混凝土超声检测的进展[J].无损检测,2002,24(10):428~431.
[2]Leonard J B,William F K,Dan M F.Improved Assessment of Mass Concrete Dams Using Acoustic Travel Time Tomogra-phy,PartⅠ-theory[J].Construction and Building Materials,2000,(14):133~146.
[3]庄天.CT原理与算法[M].上海:上海交通大学出版社,1992.
[4]刘盛东,李承华.地震走时层析成像算法与比较[J].中国矿业大学学报,2000,29(2):211~214.
[5]Martin J,Broughton K J,Giannopolous A.Ultrasonic Tomography of Grouted Duct Post-tensioned Reinforced Concrete BridgeBeams[J].NDT&E International,2001,(34):107~113.
[6]赫尔曼GT.由投影重建图像—CT的理论基础[M].北京:科学出版社,1985.
[7]王五平,宋人心,傅翔,等.用超声波CT探测混凝土内部缺陷[J].水利水运工程学报,2003,56(5):56~60.
[2]Leonard J B,William F K,Dan M F.Improved Assessment of Mass Concrete Dams Using Acoustic Travel Time Tomogra-phy,PartⅠ-theory[J].Construction and Building Materials,2000,(14):133~146.
[3]庄天.CT原理与算法[M].上海:上海交通大学出版社,1992.
[4]刘盛东,李承华.地震走时层析成像算法与比较[J].中国矿业大学学报,2000,29(2):211~214.
[5]Martin J,Broughton K J,Giannopolous A.Ultrasonic Tomography of Grouted Duct Post-tensioned Reinforced Concrete BridgeBeams[J].NDT&E International,2001,(34):107~113.
[6]赫尔曼GT.由投影重建图像—CT的理论基础[M].北京:科学出版社,1985.
[7]王五平,宋人心,傅翔,等.用超声波CT探测混凝土内部缺陷[J].水利水运工程学报,2003,56(5):56~60.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心