Study on electric field component imaging of leakage in pipeline using GPR
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摘要: 探地雷达（GPR）是管线渗漏探测的有效方法，但是当地下介质分布较为复杂时，难以直接从GPR数据剖面图中准确识别出渗漏异常区。为此，针对渗漏异常区含水量高的特点，根据反射波系数与介电常数的关系，提出了GPR数据的电场分量成像技术。利用时间域有限差分法（FDTD）模拟了不同介电参数的地质模型在GPR中的电磁波响应，由正演模拟结果可知分界面两侧介质的介电常数差异性越大反射波能量越强。最后将GPR数据的电场分量成像技术应用于某工业区管道渗漏探测中。试验结果表明，管道渗漏异常区在电场分量图谱中表现为高幅值区。Abstract: Ground penetrating radar(GPR) is an effective method for pipeline leak detection, but when the distribution of underground media is more complex, it is difficult to accurately identify the leakage anomaly from the GPR data profile. In this paper, the imaging technique of GPR data based on electric field component is proposed according to the relationship between the reflection coefficient and the dielectric constant. In this paper, the time-domain finite difference method(FDTD) is used to simulate the electromagnetic response of the geo-electric model with different dielectric constant in the GPR. The results show that the greater the difference in dielectric constant, the stronger the reflected wave energy. Finally, the proposed imaging technique is applied to pipeline leakage detection in an industrial area. The experimental results show that the pipeline leakage anomaly area is characterized by high amplitude area in the electric field component map.
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