Abstract

We consider ultrasound tomography of concrete building structures containing defects arranged at large angles to the antenna array (AA). In oblique sounding of such building units made of complex-structured concrete, the influence of pattern noise (PN) increases due to the effect of negative cross-correlation of PN signals on adjacent AA transducers. It has been shown that the optimum (providing the maximum signal–to–pattern-noise ratio) antenna-array pitch for oblique sounding should be (0.35–0.4)\(\lambda \). It is shown that, in the tomography of inside corners at the junction of two walls, it is advisable to use either two separate antenna arrays, designed for oblique sounding of building structures, located on different sides of a corner wall junction or a single antenna array consisting of two linear AAs combined into one antenna in order to more efficiently extract useful signals from PN and increase the angular resolution.

中文翻译：

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具有横向信号辐射的混凝土建筑结构的超声波断层扫描仪

摘要

我们考虑混凝土断层结构的超声层析成像，该结构包含与天线阵列（AA）成大角度排列的缺陷。在这种由复杂结构的混凝土制成的建筑物单元的倾斜探测中，由于PN信号对相邻AA换能器的负互相关的影响，图案噪声（PN）的影响增加了。研究表明，倾斜探测的最佳天线阵间距（提供最大的信噪比）应为（0.35–0.4）\（\ lambda \）。结果表明，在两壁交界处的内部拐角层析成像中，建议使用两个单独的天线阵列（设计用于倾斜建筑物墙体）位于角墙交界处的不同侧，或者使用一个天线由两个线性AA组合成一个天线的阵列，以便更有效地从PN提取有用信号并提高角分辨率。