Superimposed imaging of acoustic wave reflections for the detection of underground nonmetallic pipelines
Superimposed imaging of acoustic wave reflections for the detection of underground nonmetallic pipelines
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DOI：
10.1016/j.ymssp.2024.111127
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发表时间：
2024-01-14
影响因子：
8.4
通讯作者：
Liu，Yuyou
中科院分区：
文献类型：
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作者：
Cui，Xiwang;Gao，Yan;Liu，Yuyou
由于非金属管道具有不导电、无磁性的特性，传统的管道定位技术很难对其进行检测。本文提出了一种用于管道定位的声波反射叠加成像方法，该方法基于弹性波的传播。根据声源、检波器阵列和管道之间的几何关系，构建了弹性波在土壤中的传播和衰减模型。通过声源与检波器阵列信号的互相关系数叠加成像生成地下管道二维和三维声场图，成像过程中考虑滞回阻尼和几何耗散引起的衰减。为了抑制杂波对成像结果的干扰，采用“多点发射、多点接收、互相关系数叠加”的策略。仿真中比较了单频信号、多频信号、高斯脉冲信号和扫频信号等不同激励源对探测成像结果的影响。研究发现，频率成分丰富的激励信号更有利于提高检测图像的分辨率。实验工作进一步验证了该成像方法的有效性，有利于地下非金属管道位置、深度和方位的可视化和确定。
Due to the non-conductive and non-magnetic properties, nonmetallic pipelines are difficult to be detected by traditional pipe location technologies. This paper presents a superimposed imaging method of acoustic wave reflections for pipe location, which operates on the propagation of elastic waves. The propagation and attenuation model of elastic waves in soil are constructed according to the geometric relationship between the acoustic source, geophone array and pipelines. The two-dimensional and three-dimensional acoustic field diagrams of underground pipeline are generated by superimposed imaging of the cross-correlation coefficients between the signals from the sound source and geophone array, with the attenuation caused by hysteretic damping and geometric dissipation considered in the imaging process. In order to suppress clutter interference on the imaging results, the strategy of ‘multi-point transmit, multi-point receive and cross-correlation coefficient superposition’ is adopted. In the simulation, comparison is made to demonstrate the influences of different excitation sources on the detection imaging results, including the single frequency signal, multi-frequency signal, Gaussian pulse signal and sweep signal. It is found that the excitation signals with rich frequency components are more conducive to improving the resolution of detection images. The effectiveness of the proposed imaging method is further verified in the experimental work, which may be beneficial for the visualization and determination of the location, depth and orientation of underground non-metallic pipelines.