下表面腐蚀定量中的低频脉冲涡流检测技术
Low-Frequency Pulsed Eddy Current Testing Technology in Quantification of Corrosion on Sub-Surface
摘 要
由于受集肤效应的影响, 传统的涡流检测技术很难对多层结构中的腐蚀缺陷进行有效检测。为解决飞机结构中下表面缺陷的定量检测问题, 通过研究低频涡流与脉冲涡流检测技术原理, 结合两者的优点, 设计研制了一套完整的无损检测系统。在对检测信号进行瞬态分析的基础上, 通过峰值、过零时间等特征量, 实现了下表面腐蚀缺陷体积与深度的定量检测。而且通过对峰值曲线的分析, 实现了缺陷长度的定量检测。试验结果表明, 低频脉冲涡流检测技术在飞机无损检测行业中具有广阔的应用前景。
定量
低频脉冲涡流技术
峰值
过零时间
Corrosion
Quantitative test
Low-frequency and pulsed eddy current testing technique
Peak
Zero-crossing time
Abstract
It is difficult to detect corrosion effectively in the multi-layer structure for traditional eddy current technology because of skin effect. For solving the problem of quantitatively testing of corrosion on subsurface in multi-layer structure, a corrosion NDT system was designed and established after researching and combining the low-frequency and pulsed eddy current technology. Based on transient analysis of detecting signal, peak and zero-crossing times were extracted as the features to measure the volume and depth of corrosion on the subsurface quantitatively. In addition, the length of corrosion was measured quantitatively by analysis of peak curve. It was confirmed that low-frequency and pulsed eddy current technology had extensively applied foreground in NDT of aircraft.
中图分类号 TM935.4 TG115.28
所属栏目 试验研究
基金项目
收稿日期 2008/3/10
修改稿日期
网络出版日期
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备注何赟泽(1983-), 男, 硕士研究生, 研究方向为电磁无损检测技术和数字化测试技术。
引用该论文: HE Yun-Ze,LUO Fei-Lu,FENG Ting-Ting. Low-Frequency Pulsed Eddy Current Testing Technology in Quantification of Corrosion on Sub-Surface[J]. Nondestructive Testing, 2009, 31(3): 214～216
何赟泽,罗飞路,冯婷婷. 下表面腐蚀定量中的低频脉冲涡流检测技术[J]. 无损检测, 2009, 31(3): 214～216
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参考文献
【1】许万忠.低频涡流技术的应用[J].无损检测,1996,18(8): 227-231.
【2】Moulder J C, Bieber J A, Ward W W, et al. Scanned pulsed eddy current instrument for nondestructive inspection of aging aircraft[J]. Proceedings of SPIE-The International Society for Optical Engineering,1996,2945: 2-13.
【3】Safizadeh M S, Lepine B A, Forsyth D S, et al. Time-frequency analysis of pulsed Eddy current signals[J]. Journal of Nondestructive Evaluation,2001,20(2): 73-86.
【2】Moulder J C, Bieber J A, Ward W W, et al. Scanned pulsed eddy current instrument for nondestructive inspection of aging aircraft[J]. Proceedings of SPIE-The International Society for Optical Engineering,1996,2945: 2-13.
【3】Safizadeh M S, Lepine B A, Forsyth D S, et al. Time-frequency analysis of pulsed Eddy current signals[J]. Journal of Nondestructive Evaluation,2001,20(2): 73-86.
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