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Self-resonance eddy-current testing method in noncontact detection of carbon fiber reinforced plastics

机译：碳纤维增强塑料非接触检测中的自共振涡流试验方法

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摘要

Eddy-current testing (ECT) is relatively mature and has gradually become one of the main non-destructive testing technologies of carbon fiber reinforced plastics (CFRP). From the perspective of low conductivity of CFRP, high-frequency ECT technology is considered to be more suitable for such materials with less conductivity. However, high-frequency ECT method is more susceptible to various interference factors and has higher background noise, which will cause great inconvenience to practical applications. Concerning this issue, a self-resonance ECT method in noncontact detection of CFRP was proposed in this paper, and the corresponding ECT system that can detect the defects of CFRP at a low-frequency and keep a relatively high signal-to-noise ratio was developed. The system is mainly composed of a resonant eddy-current probe, a special excitation circuit, and an ECT signal pickup module. Three CFRP samples (orthogonal woven laminate, cross-ply laminate, four-directional angle-ply laminate) were scanned by using the self-resonance ETC system developed in this paper. The scanning results show that the detection effect of the self-resonant ECT system at 500 kHz is similar to that of the traditional ECT system at 10 MHz, and 500KHz is enough to provide good detection results for the above CFRP samples. Therefore, the proposed research is a valuable ECT technology, which has played a guiding role in the application of low-frequency ECT method in CFRP.
机译：涡流测试（ECT）相对成熟，并且逐渐成为碳纤维增强塑料（CFRP）的主要无损检测技术之一。从CFRP的低导电性的角度来看，高频ECT技术被认为更适合于导电性较少的这些材料。然而，高频ECT方法更容易受到各种干扰因素的影响，并且具有更高的背景噪声，这将对实际应用造成巨大不便。关于这个问题，本文提出了一种非接触式检测中的自共振ECT方法，以及可以以低频的缺陷检测CFRP的缺陷并保持相对高的信噪比的相应的ECT系统发达。该系统主要由谐振涡流探头，特殊激励电路和ECT信号拾取模块组成。通过使用本文开发的自共振等系统扫描三种CFRP样品（正交编织层压体，交叉层叠体，四方向角层层压板）。扫描结果表明，500kHz的自谐振IC系统的检测效果类似于10MHz的传统ECT系统的检测效果，500kHz足以为上述CFRP样品提供良好的检测结果。因此，拟议的研究是一种有价值的ECT技术，它在CFRP中的低频ECT方法中发挥了指导作用。

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