Research on crack monitoring based on eddy current with PVD thin film sensor

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI:10.1109/FENDT54151.2021.9749694

Shuyang He, Fei Yang, W. Cui

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引用次数: 2

Abstract

In order to solve the problem that crack monitoring technology of PVD thin film sensor requires high synchronous fracture performance with the substrate structure, this paper changed the driving mode of PVD thin film sensor and adopted alternating current (AC), which effectively overcome the influence of this problem on crack monitoring. Firstly, the ring PVD film sensor is designed and manufactured for the edge of the bolt hole. The sensor is composed of driving film and induction film. Then, the sensor is encapsulated and insulated. Finally, the on-line fatigue crack monitoring experiment is carried out. The experimental results show that the amplitude of the output signal of the sensor starts to rise slowly with the crack growth. When the crack just passes through the induction film, the output signal of the sensor changes sharply. Therefore, the sensor can effectively monitor the crack initiation and propagation, and locate the crack tip according to the sharp change point of the output signal. The research results provide a sensor choice for the application of PVD thin film sensor in metal structural health monitoring technology.

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基于涡流PVD薄膜传感器的裂纹监测研究

为了解决PVD薄膜传感器的裂纹监测技术对衬底结构的同步断裂性能要求较高的问题，本文改变了PVD薄膜传感器的驱动方式，采用交流电，有效地克服了这一问题对裂纹监测的影响。首先，针对螺栓孔边缘设计制造了环形PVD膜传感器。传感器由驱动膜和感应膜两部分组成。然后，对传感器进行封装和绝缘。最后，进行了疲劳裂纹在线监测试验。实验结果表明，随着裂纹的扩展，传感器输出信号的幅值开始缓慢上升。当裂纹刚穿过感应膜时，传感器的输出信号发生剧烈变化。因此，该传感器可以有效地监测裂纹的起裂和扩展，并根据输出信号的急剧变化点定位裂纹尖端。研究结果为PVD薄膜传感器在金属结构健康监测技术中的应用提供了一种传感器选择。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2021 IEEE Far East NDT New Technology & Application Forum (FENDT)

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