校准
传感器
Echo(通信协议)
声学
振幅
无损检测
反射(计算机编程)
导波测试
超声波检测
重复性
焊接
计算机科学
电子工程
工程类
光学
超声波传感器
数学
物理
机械工程
统计
量子力学
程序设计语言
计算机网络
作者
Thomas Vogt,Brian Pavlakovic,Peter Cawley
标识
DOI:10.32548/2022.me-04255
摘要
Guided wave testing has become an established technology for screening long lengths of pipe for safety-critical defects from a single transducer position. The location of any defect is accurately determined and a rough idea of defect severity is obtained. However, it would be very beneficial to obtain a more accurate severity estimate from the guided wave data, especially in cases where follow-up inspection is expensive. This requires a more reliable calibration technique than the conventional approach, which relies on assumptions about the amplitudes of weld reflections. A multiple-echo calibration technique using data collected with standard test protocols but processed to extract the amplitude of reverberations between two features on either side of the sensor ring is presented, which removes the need for assumptions about the weld reflection amplitudes that reduce the accuracy of the conventional method of calibration. This novel technique is less dependent on operator judgement, and field examples presented show that it gives more accurate measures of cross-section loss than the conventional calibration technique. The improvement is particularly marked in cases where the weld geometry is not known or is nonuniform.
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