混凝土损伤定位的超声波衰减成像研究

Study on ultrasonic attenuation tomography for damage location of concrete

针对目前工程上混凝土损伤定位的超声波成像主要考虑的是速度成像,采用超声波方向性和基于Snell定律的超声波路径追踪相结合的成像手段,对一数值模型和实际混凝土试件进行了超声波衰减成像研究。衰减重建图像同速度成像结合,可对缺陷区域得出更全面的结论。在考虑超声波方向性的情况下,成像效果更好。基于速度成像图的Snell路径追踪适用于衰减成像,可提高反演精度。

Ultrasound tomography of the damage location of concrete in the current project mainly considers velocity tomography.In this paper,ultrasonic directionality and ultrasonic path tracking based on Snell′s law are used to combine tomography methods to study ultrasonic attenuation tomography of a numerical model and actual concrete specimen.Reducing reconstructed tomography combined with velocity tomography can lead to more comprehensive conclusions on defect areas.In the case of considering the directionality of ultrasonic waves,the tomography effect is better.Snell path tracking based on velocity tomography is suitable for attenuation tomography and can improve inversion accuracy.