利用交流电桥技术进行涡流钢轨检测。

IF 1.5 4区 工程技术
Ze Liu, Andrew D Koffman, Bryan C Waltrip, Yicheng Wang
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引用次数: 29

摘要

通常用于精密阻抗测量的交流桥技术已被用于开发用于轨道缺陷检测的涡流传感器。通过使用两个检测线圈而不是传统传感器中的一个,我们可以平衡与正常轨道对应的大基线信号。采用数字锁相放大器算法对钢轨缺陷引起的两个线圈的差分信号进行检测和解调,显著提高了涡流法的检测灵敏度。我们还探讨了利用检测线圈的求和信号来测量升力距离,以补偿涡流传感器由于振动而产生的升力效应。求和信号的主导分量是由激励线圈直接耦合产生的常数,可以通过实验确定。剩余的加和信号,随着升离距离的增加而减小,是由二次涡流引起的。这种对升降距离的依赖被用来校准差分信号,允许对缺陷进行更准确的表征。利用计算机控制的X-Y移动台,x轴模拟列车的运动,y轴模拟列车的振动碰撞,对样品轨道进行了模拟实验。实验结果证明了该检测方法的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Eddy Current Rail Inspection Using AC Bridge Techniques.

Eddy Current Rail Inspection Using AC Bridge Techniques.

Eddy Current Rail Inspection Using AC Bridge Techniques.

Eddy Current Rail Inspection Using AC Bridge Techniques.

AC bridge techniques commonly used for precision impedance measurements have been adapted to develop an eddy current sensor for rail defect detection. By using two detection coils instead of just one as in a conventional sensor, we can balance out the large baseline signals corresponding to a normal rail. We have significantly enhanced the detection sensitivity of the eddy current method by detecting and demodulating the differential signal of the two coils induced by rail defects, using a digital lock-in amplifier algorithm. We have also explored compensating for the lift-off effect of the eddy current sensor due to vibrations by using the summing signal of the detection coils to measure the lift-off distance. The dominant component of the summing signal is a constant resulting from direct coupling from the excitation coil, which can be experimentally determined. The remainder of the summing signal, which decreases as the lift-off distance increases, is induced by the secondary eddy current. This dependence on the lift-off distance is used to calibrate the differential signal, allowing for a more accurate characterization of the defects. Simulated experiments on a sample rail have been performed using a computer controlled X-Y moving table with the X-axis mimicking the train's motion and the Y-axis mimicking the train's vibrational bumping. Experimental results demonstrate the effectiveness of the new detection method.

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来源期刊
自引率
33.30%
发文量
10
期刊介绍: The Journal of Research of the National Institute of Standards and Technology is the flagship publication of the National Institute of Standards and Technology. It has been published under various titles and forms since 1904, with its roots as Scientific Papers issued as the Bulletin of the Bureau of Standards. In 1928, the Scientific Papers were combined with Technologic Papers, which reported results of investigations of material and methods of testing. This new publication was titled the Bureau of Standards Journal of Research. The Journal of Research of NIST reports NIST research and development in metrology and related fields of physical science, engineering, applied mathematics, statistics, biotechnology, information technology.
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