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A high-efficiency nondestructive method for remote detection and quantitative evaluation of pipe wall thinning using microwaves

机译：一种高效的微波无损检测和定量评估管壁变薄的无损方法

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摘要

We report an efficient nondestructive evaluation (NDE) method to measure the pipe wall thinning (PWT) remotely using microwaves. A microwave vector network analyzer (VNA) and a self-designed transmitting and receiving (T&R) coaxial-line sensor were employed in the experiment to generate microwave signals propagating in the pipe where the frequency was swept from 14.00 to 14.20 GHz. A brass pipe with inner diameter of 17.03 mm, 1.0 mm wall thickness, 2.0 m length, and connected, respectively, with 6 joints having the length of 17.0 mm and PWT from 0% to 60% of wall thickness was measured. By taking the pipe as a circular waveguide of microwave, after building up a resonance condition and then solving the resonance equations, the evaluation of PWT was realized. By comparing the evaluated results obtained using our suggested method with the nominal inner diameters of the joints, the maximum evaluation error is found to be less than 0.05 mm, which is less than 0.294% of the inner diameter of the pipe, which indicates that a high precision evaluation method is established.
机译：我们报告了一种有效的无损评估（NDE）方法，可使用微波远程测量管壁变薄（PWT）。实验中使用了微波矢量网络分析仪（VNA）和自行设计的发射和接收（T＆R）同轴线传感器，以生成在管道中传播的微波信号，该管道的频率从14.00 GHz扫至14.20 GHz。分别测量了内径为17.03 mm，壁厚为1.0 mm，长度为2.0 m的黄铜管，并连接了6个长度为17.0 mm的接头，PWT为壁厚的0％至60％。以管道为微波的圆形波导，建立共振条件，然后求解共振方程，实现了PWT的评估。通过使用我们建议的方法获得的评估结果与接头的公称内径进行比较，发现最大评估误差小于0.05毫米，小于管道内径的0.294％，这表明建立了高精度评估方法。

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