《机械工程学报》第三届高影响力论文系列报道（五）

　　《机械工程学报》、《Chinese Journal of Mechanical Engineering》是由中国科学技术协会主管、中国机械工程学会主办的中国机械工程领域的顶级学术刊物，主要报道机械工程领域及其交叉学科具有创新性的基础理论研究、工程技术应用的优秀科研成果，两刊均已成为国内外机械工程领域具有高影响力的学术期刊。

　　科学的未来在青年。在我国从“制造大国”向“制造强国”迈进之时，青年科技工作者是科技创新的生力军。《机械工程学报》编辑部JME学院旨在团结青年、凝聚青年、服务青年，构建平等、宽松、自由的学术交流平台。

　　高影响力论文评选活动由中国机械工程学会、两刊编委会、董事会以及编辑部JME学院共同组织策划，旨在评选出创新性强、学术影响力高、关注度广的优秀论文，并予以奖励优秀论文的作者。

　　

　　高影响力论文获奖作者代表

　　

　　获奖代表：电子科技大学、英国纽卡斯尔大学田贵云教授

　　论文题目：Pulsed Eddy Current Non-destructive Testing and Evaluation: A Review

　　论文作者：Ali Sophian , Guiyun Tian , and Mengbao Fan

　　作者代表：Guiyun Tian

　　单位：

　　1. Faculty of Engineering, International Islamic University Malaysia, Malaysia.

　　2. School of Automation Engineering, University of Electronic Science and Technology of China,Chengdu, China.

　　3. School of Electrical and Electronic Engineering, Newcastle University, NE1 7RU, UK.

　　4. School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China.

　　职务/职称：教授

　　研究方向：电磁传感器技术、无损检测技术、信号处理技术和分布式无线传感器技术等。

　　摘要：Pulsed eddy current (PEC) non-destructive testing and evaluation (NDTE) has been around for some time and it is still attracting extensive attention from researchers around the globe, which can be witnessed through the reports reviewed in this paper. Thanks to its richness of spectral components, various applications of this technique have been proposed and reported in the literature covering both structural integrity inspection and material characterization in various industrial sectors. To support its development and for better understanding of the phenomena around the transient induced eddy currents, attempts for its modelling both analytically and numerically have been made by researchers around the world. This review is an attempt to capture the state-of-the-art development and applications of PEC, especially in the last 15 years and it is not intended to be exhaustive. Future challenges and opportunities for PEC NDTE are also presented.

　　文章介绍：

　　1、 论文研究背景及目的：

　　Pulsed eddy current(PEC) non-destructive testing and evaluation (NDT&E) has been around forsome time and it is still attracting extensive attention from researchersaround the globe, which can be witnessed through the reports reviewed in thispaper. Thanks to its richness of spectral components, various applications ofthis technique have been proposed and reported in the literature covering bothstructural integrity inspection and material characterization in variousindustrial sectors. To support its development and for better understanding ofthe phenomena around the transient induced eddy currents, attempts for itsmodelling both analytically and numerically have been made by researchersaround the world. This review is an attempt to capture the state-of-the-artdevelopment and applications of PEC, especially in the last 15 years and it isnot intended to be exhaustive. Future challenges and opportunities for PECNDT&E are also presented.

　　2、 试验方法：

　　Despite variations thatexist, a typical PEC system will look like the illustration shown in Fig. 1. Apulse signal at a chosen frequency and pulse width is generated which is thenpower-amplified to drive an excitation coil. In turn, a time-varying magneticfield is induced by the current in the excitation coil. The magnetic field,which is called the primary field, induces eddy current in the sample.Consecutively, a secondary magnetic field is induced by the eddy current and itopposes the primary field. This secondary field is then detected by a sensingdevice, which typically can be either a magnetic sensor or a coil. The outputsignal of the sensing device is then passed to the next stage to be conditionedand processed where eventually features are extracted in order to infer thedesired parameters, such as wall thickness and lift-off, from the testing.Flexiblecoil for probe configurations has also been used, such as a planar matrix probethat can generate a 2D map that is useful in the location of defects, as shownin Fig. 2(a). The application of independent excitations leads to a moreuniform excitation field which, in turn, leads to a simpler interpretation ofthe detected signals. Another of the use of sensor array in ECT, is shown inFig. 2(b), where the printed array is flexible and can be used to produce acolor map of surface corrosion.

　　

　　Fig.1 Generic configuration of a PEC NDT system

　　

　　Fig.2 Examples ofarrayed sensors: (a) A planar matrix probe 港澳剧 (b) A flexible printed circuit array

　　3、 结论：

　　PEC NDT&E hasreceived a great deal of attention from researchers in the past 30 years andmore, and yet, new applications and techniques are still being proposed andreported, as shown in this review. This gives approval to the theoreticalunderstanding that PEC is rich of information that is potentially useful forquantitative NDT&E. It leads further work of eddy current pulsedthermography (ECPT) and pulsed compression PEC and ECPT. For instance, inaddition to conventional single pulse excitation for the eddy current,implementing multi-pulse with different widths can further increase theapplicability and detectability of eddy current techniques. Fig 3 shows theprinciple of pulse compression eddy current, the impulse response will beobtained by convolving the experimental output with modulated pulse, so thatSNR of signal will dramatically increase.

　　

　　Fig.3Pulsed Compression for PEC

　　创新点：脉冲涡流检测具有频谱丰富、渗透深度大等优点，在结构完整性评价和材料表征中应用广泛。本文从脉冲涡流检测基本原理出发，系统综述了仪器、解析和数值建模、新型探头设计、信号特征及提取、缺陷量化等主要研究内容；侧重阐述了脉冲涡流检测提离效应及抑制、代表性工程应用如柔性阵列探头和作者团队在脉冲涡流检测方面的研究成果，最后对脉冲涡流检测面临的挑战问题进行了论述与展望。

　　引用本文：

　　SOPHIAN ALI , TIAN GUIYUN , FAN MENGBAO. Pulsed Eddy Current Non-destructive Testing and Evaluation: A Review[J]. Chinese Journal of Mechanical Engineering, 2017，30(3)： 500-514.

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