Nondestructive Testing of Nonmetallic Pipelines Using Microwave Reflectometry on an In-Line Inspection Robot
Nondestructive Testing of Nonmetallic Pipelines Using Microwave Reflectometry on an In-Line Inspection Robot
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DOI：
10.1109/tim.2018.2847780
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发表时间：
2019-02-01
影响因子：
5.6
通讯作者：
Sloan, Robin
中科院分区：
文献类型：
--
作者：
Carrigan, Tobias D.;Forrest, Benjamin E.;Sloan, Robin
微波毫米波反射法是一种新兴的非金属管道无损检测技术。本文介绍了一种K波段微波反射仪上实现的在线管道爬行机器人，光栅扫描裂纹和外壁损失的高密度聚乙烯（HDPE）管的直径为150毫米，壁厚为9.8毫米。该管进行了扫描与周围的管道，近似的使用情况下，地上的HDPE管道，塑料内衬的金属管，和海底HDPE管道的三个环境。当裂纹平行于其磁（H）平面时，仪器最灵敏。仪器探头天线和管壁之间的间隔距离的任何微小变化（这是不容易避免的）都会模糊图像。为了缓解这一问题，灵敏度分析表明，可以选择最佳频率，在该频率下，间隔距离可以在一定范围内变化高达+/- 0.75 mm，而不会使图像上的缺陷指示失真。
Microwave and millimeter-wave reflectometry, a form of continuous-wave surface penetrating radar, is an emerging nondestructive inspection technique that is suitable for nonmetallic pipelines. This paper shows a K-band microwave reflectometry instrument implemented onto an in-line pipe-crawling robot, which raster-scanned cracks and external wall loss on a high-density polyethylene (HDPE) pipe of diameter 150 mm and wall thickness 9.8 mm. The pipe was scanned with three environments surrounding the pipe that approximated the use cases of overground HDPE pipelines, plastic-lined metal pipes, and undersea HDPE pipelines. The instrument was most sensitive when cracks were oriented parallel to its magnetic (H) plane. Any small variation in the standoff distance between the instrument's probe antenna and the pipe wall, which was not easy to avoid, was found to obscure the image. To mitigate this problem, a sensitivity analysis showed that an optimal frequency can be chosen at which standoff distance can vary by up to +/- 0.75 mm within a certain range without distorting the indications of defects on the image.