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In-Line Ultrasonic Monitoring for Sediments Stuck on Inner Wall of a Polyvinyl Chloride Pipe

机译：在线超声波监测沉积在聚氯乙烯管内壁上的沉积物

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摘要

This research verified the applicability and effectiveness of the ultrasonic monitoring of sediments stuck on the inner wall of polyvinyl chloride (PVC) pipes. For identifying the transmittance of acoustic energy and the speed of sound in the PVC material, the pulse-echo ultrasonic testing was conducted for PVC sheets of different thicknesses. To simulate the solidified sediment, the hot melt adhesive (HMA) was covered on the inner wall of the PVC pipe in different heights. From the experiment, the speeds of sound in the PVC and the HMA materials were obtained as about 2258 and 2000 m/s, respectively. The thickness of the materials was calculated through the signal processing such as taking the absolute value and low pass filtering, the echo detection, and the measurement of the time of flight. The errors between actual and measured thicknesses of PVC sheets were below 5%. In the case of the substance stuck on the inner wall, the errors were below 2.5%. Since the pulse-echo ultrasonic inspection is available on the outer surface and its measurement accuracy was over 95%, it can be an efficient and effective in-service structural health monitoring for the sediment on the wall of PVC pipes.
机译：这项研究证实了超声监测聚氯乙烯（PVC）管内壁上沉积物的适用性和有效性。为了确定PVC材料中的声能透射率和声速，对不同厚度的PVC板进行了脉冲回波超声测试。为了模拟固化的沉积物，将热熔胶（HMA）以不同的高度覆盖在PVC管的内壁上。从实验中得出，PVC和HMA材料的声速分别约为2258和2000μm/ s。材料的厚度是通过信号处理来计算的，例如进行绝对值和低通滤波，回波检测以及飞行时间的测量。 PVC板的实际厚度与测量厚度之间的误差低于5％。如果物质粘附在内壁上，则误差低于2.5％。由于可以在其外表面进行脉冲回波超声波检查，并且其测量精度超过95％，因此可以对PVC管壁上的沉积物进行有效且有效的在役结构健康监测。

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