【摘要】 提出了采用反褶积技术提高混凝土结构中超声叠前偏移成像剖面的纵向分辨率的方法.首先阐述了反褶积及叠前偏移成像理论,然后给出了反褶积技术在Ricker脉冲信号和混凝土结构叠前偏移成像任意试验信号处理中的应用,最后将反褶积技术应用于叠前偏移成像处理前的数据预处理和之后的后处理试验.并在预设内部缺陷的混凝土试件上进行了试验.结果表明,反褶积技术对单个脉冲或工程结构任意测试信号的首波都具有锐化首波的作用;在叠前偏移成像技术中,反褶积技术可以起到锐化损伤边缘、提高叠前偏移剖面分辨率的作用.更多还原

【Abstract】 The deconvolution techniques were adopted to improve the vertical resolution of ultrasonic pre-stack migration imaging profiles of the concrete structures. Firstly,the theories of deconvolution and pre-stack migration imaging were introduced. Secondly,the deconvolution was used to sharpen the first wave of the Ricker pulse signal and the arbitrary collection of ultrasonic signal. Thirdly,the deconvolution was applied to deal with the collected signals and the pre-stack migration imaging data. The experiments were carried out on concrete samples with preinstalled internal defect. The results show that deconvolution techniques can not only sharpen a single pulse or random one of the wave arrival of test signals for engineering structure,but also can sharpen the edge damage,and increase the resolution of pre-stack migration section in the pre-stack migration imaging technology.更多还原