基于平面线圈电容电感效应的双模式检测技术  

Dual Modality Inspection Technique Based on Capacitive-inductive Effect of Planar Coil

作　　者：殷晓康[1] 李盈盈 张晓瑞[1] 朱挺 王明达[1] 李伟[1] 陈国明[1] YIN Xiaokang;LI Yingying;ZHANG Xiaorui;ZHU Ting;WANG Mingda;LI Wei;CHEN Guoming(Centre for Offshore Engineering and Safety Technology,China University of Petroleum(East China),Qingdao 266580)

机构地区：[1]中国石油大学(华东)海洋油气装备与安全技术研究中心,青岛266580

出　　处：《机械工程学报》2021年第14期168-176,共9页Journal of Mechanical Engineering

基　　金：国家自然科学基金(52075549,51675536);中央高校基本业务费自主创新(20CX05020A)资助项目。

摘　　要：在电磁无损检测领域,涡流检测技术被用于导电材料的检测,电容成像技术被用于绝缘材料的检测。而针对玻纤复合材料修复结构这类"绝缘-导电"混合结构,单一涡流或电容技术无法实现混合结构各层材料中多类型缺陷的全面检测。通过采用平面线圈探头及较高频率激励,线圈电容效应得以增强,结合线圈本身的电感效应,可同时实现电容、涡流两种模式的检测,弥补单一技术的固有局限性。从双模式检测系统电容效应、检测系统等效电路分析及被测对象参数对阻抗测量影响三个角度对双模式检测技术的工作原理进行了分析,构建了采用平面线圈探头的电容-涡流双模式检测系统,并对玻璃钢和"玻璃钢-金属"混合结构两类典型试块中的表面与隐藏缺陷进行了检测。结果表明,基于平面线圈电容电感效应的双模式检测技术可同时实现对绝缘材料与导电材料中缺陷的检测,并可根据不同激励频率下的探头响应实现缺陷的区辨,有望满足复合材料修复结构等"绝缘-导电"混合结构的全面检测需求。In the field of electromagnetic non-destructive testing, eddy current technique is used for the inspection of conducting materials, and capacitive imaging technique is used for the inspection of insulating materials. For some insulator-conductor hybrid structures, e.g., structures with glass fibre composite repairs, it is difficult to fullfill the requirements with only one inspection method. By using planar coil probe and high frequency excitation, the capacitive effect of the coil can be enhanced, together with the inductive effect of the coil, capacitive-eddy current dual-modality inspection can be achieved, and the inherent limitations of each single mode method can be overcome. The theory of the dual-modality technique, including the capacitive effect, the equivalent circuit and the influence of the specimen on the impedance measurement, was analysed, dual-modality inspection system with planar coil probe was built, surface and hidden defects in two types of typical specimens, namely glass fibre reinforces plastic(GFRP) and GFRP-metal hybrid structure were inspected. The experimental results indicate that, the dual-modality inspection technique based on the capacitive-inductive effect of planar coil can simultaneously realize the detection of defects in insulating materials and conducting materials, and can discriminate defects based on the probe responses at different excitation frequencies, so as to meet the comprehensive inspection requirements of insulator-conductor hybrid structure, such as structure with composite repair.

关 键 词：双模式检测 电容电感效应 缺陷成像 混合结构 

分 类 号：TH878[机械工程—仪器科学与技术]