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Three-dimension diagnostic methods of quay wall using focusing acoustic parametric probe and imaging sonar

机译:使用聚焦声学参数探头和成像声纳的码头墙的三维诊断方法

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Collapse and subsidence of quay wall at a harbor are often reported and a diagnosis method to prevent the accident has become a significant concern. To achieve the more accurate assessment of quay wall, we try to develop the new diagnosis method which enables to estimate the inside and outside state of the quay wall from the underwater site. In this study, the outside mapping of the quay wall was conducted using multi-beam echo sounder, and the focusing acoustic parametric probe was developed for the detection of the air hole inside the quay wall. Outside mapping was performed at the port in Chiba. Three-dimensional image of the quay wall was reconstructed from the bathymetry data and seafloor topographys, and the mean tilt angle of quay wall was quantified. The sediments and tilted quay wall were clearly seen in this experiment. The acoustic characteristic of the probe, which was developed for the inner air hole detection, were evaluated in the experimental aquarium using three transmission signals [Summing1, 2 and linear frequency modulation signals (LFM)]. We have succeeded in the observation of the penetration wave passed through the concrete plate of 7 cm thickness. In our study, LFM signal showed the best results of the acoustic characteristics in three ones.
机译:倒塌和码头墙的沉降经常报道,并诊断方法,以防止事故成为一个重要的问题。为实现码头墙更准确的评估,我们试图开发新的诊断方法,使能够从水下站点估计码头墙的内外状态。在该研究中,使用多光束回波发声器进行码头壁的外部映射,并且开发了聚焦声参数探针用于检测码头壁内的空气孔。在千叶的港口进行外部映射。从碱基壁和海底拓扑重建码头墙的三维图像,量化码头壁的平均倾斜角度。在这个实验中清楚地看到了沉积物和倾斜的码头墙。利用三个传输信号[Summing1,2和线性频率调制信号(LFM)]在实验水族馆中评估了用于内部空气孔检测的探针的声学特性。我们在观察到穿过7厘米厚的混凝土板的渗透波的观察。在我们的研究中,LFM信号显示了三个中的声学特性的最佳结果。

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