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Dr. Yong Li
School of Aerospace Engineering, Xi'an Jiaotong University, ShaanXi, Xi'an 710049, China

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Research Keywords & Expertise

0 materials characterization
0 Signal/image processing
0 Non-destructive testing and evaluation
0 Non-invasive assessment of coating systems
0 Corrosion imaging

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Corrosion imaging
Signal/image processing
Non-destructive testing and evaluation

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Journal article
Published: 16 January 2021 in NDT & E International
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Subsurface corrosion occurring in the conductive structures prone to long-term exposure to harsh and corrosive environments essentially leads to the reduction in the critical area of load carrying members, adversely aggravating the mechanical strength and structural integrity of in-service structures. This has prompted the high demand for non-invasive detection and evaluation of subsurface corrosion using non-destructive evaluation techniques. Pulse-modulation Eddy Current testing (PMEC) has been found to be superior to pulsed eddy current testing in terms of higher sensitivity to subsurface corrosion and accuracy in corrosion imaging. In this paper, a funnel-shaped PMEC probe is utilised for subsurface corrosion imaging along with the inspection sensitivity further enhanced. A novel signal feature of PMEC, namely the averaged peak value is proposed in a bid to improve the signal-to-noise ratio of the PMEC testing, based on which corrosion images are produced. In order to enhance accuracies in image-based profile identification and opening-area assessment of subsurface corrosion, an improve Small Sub-domain Filtering Method (SSFM) together with Canny algorithm is proposed and exploited in the image processing for corrosion-profile recognition. It has been indicated from the experimental results that the subsurface corrosion profile can be well identified using the proposed signal and image processing methods which could keep robust in the testing environment subject to extraneous noises. For the experimental specimens, the accuracy of the subsequent evaluation particularly regarding the corrosion-opening area reaches 94.5% at minimum.

ACS Style

Bei Yan; Yong Li; Zhengshuai Liu; Shuting Ren; Ilham Mukriz Zainal Abidin; Zhenmao Chen. Pulse-modulation eddy current imaging and evaluation of subsurface corrosion via the improved small sub-domain filtering method. NDT & E International 2021, 119, 102404 .

AMA Style

Bei Yan, Yong Li, Zhengshuai Liu, Shuting Ren, Ilham Mukriz Zainal Abidin, Zhenmao Chen. Pulse-modulation eddy current imaging and evaluation of subsurface corrosion via the improved small sub-domain filtering method. NDT & E International. 2021; 119 ():102404.

Chicago/Turabian Style

Bei Yan; Yong Li; Zhengshuai Liu; Shuting Ren; Ilham Mukriz Zainal Abidin; Zhenmao Chen. 2021. "Pulse-modulation eddy current imaging and evaluation of subsurface corrosion via the improved small sub-domain filtering method." NDT & E International 119, no. : 102404.

Journal article
Published: 08 April 2020 in Sensors and Actuators A: Physical
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The subsurface flaw has been taken as one of the most severe threats to integrity and safety of conductive structures, leading to structural failure and catastrophic accidents. The nonintrusive detection and evaluation of subsurface flaws via effective Non-destructive Evaluation (NDE) techniques are the pressing concern, which essentially relies on the high testing sensitivity to a subsurface flaw. Following the proposition of Pulse-modulation Eddy Current technique (PMEC) for high-sensitivity evaluation and imaging of subsurface defects in conductors with pancake-shaped probes, in this paper the funnel-shaped PMEC probe is proposed in a bid to further enhance the testing sensitivity to the subsurface flaw by geometrically extending the cross-section of the excitation coil from rectangle to parallelogram whilst keeping the inner and outer diameters of the bottom winding fixed. Closed-form expressions of field quantities and testing signals for the proposed probe are formulated, based on which the theoretical investigation of the probe and its comparison with the pancake-shaped probe is intensively conducted. In parallel, a series of experiments for evaluation and imaging of localised subsurface corrosion via PMEC are carried out together with intensive assessment regarding testing sensitivities of the funnel-shaped and pancake-shaped probes. Through theoretical simulations and experiments, it has been revealed that the proposed funnel-shaped probe is advantageous over the pre-designed pancake-shaped probe, giving higher sensitivity to hidden flaws in conductors. This is beneficial to detection, evaluation and imaging of subsurface defects in conductive structures.

ACS Style

Yong Li; Zhengshuai Liu; Bei Yan; Yi Wang; Ilham Mukriz Zainal Abidin; Zhenmao Chen. A funnel-shaped probe for sensitivity enhancement in pulse-modulation eddy current inspection of subsurface flaws in conductors. Sensors and Actuators A: Physical 2020, 307, 111991 .

AMA Style

Yong Li, Zhengshuai Liu, Bei Yan, Yi Wang, Ilham Mukriz Zainal Abidin, Zhenmao Chen. A funnel-shaped probe for sensitivity enhancement in pulse-modulation eddy current inspection of subsurface flaws in conductors. Sensors and Actuators A: Physical. 2020; 307 ():111991.

Chicago/Turabian Style

Yong Li; Zhengshuai Liu; Bei Yan; Yi Wang; Ilham Mukriz Zainal Abidin; Zhenmao Chen. 2020. "A funnel-shaped probe for sensitivity enhancement in pulse-modulation eddy current inspection of subsurface flaws in conductors." Sensors and Actuators A: Physical 307, no. : 111991.

Journal article
Published: 01 January 2020 in Chinese Journal of Mechanical Engineering
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ACS Style

Cai Rui; Li Yong; Liu Tianhao; Pei Cuixiang; Chen Zhenmao. A Hybrid Method for Efficient Simulation and Feasibility Study of Guided-wave Electromagnetic Acoustic Transducers for Inspection of Metallic Tubes with Small Diameters. Chinese Journal of Mechanical Engineering 2020, 56, 34 -41.

AMA Style

Cai Rui, Li Yong, Liu Tianhao, Pei Cuixiang, Chen Zhenmao. A Hybrid Method for Efficient Simulation and Feasibility Study of Guided-wave Electromagnetic Acoustic Transducers for Inspection of Metallic Tubes with Small Diameters. Chinese Journal of Mechanical Engineering. 2020; 56 (10):34-41.

Chicago/Turabian Style

Cai Rui; Li Yong; Liu Tianhao; Pei Cuixiang; Chen Zhenmao. 2020. "A Hybrid Method for Efficient Simulation and Feasibility Study of Guided-wave Electromagnetic Acoustic Transducers for Inspection of Metallic Tubes with Small Diameters." Chinese Journal of Mechanical Engineering 56, no. 10: 34-41.

Journal article
Published: 31 October 2019 in IEEE Transactions on Industrial Informatics
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Inverse analysis is a promising tool for quantitative evaluation offering informative model-based prediction and providing accurate reconstruction results without pre-inspections for characterization criteria. For traditional defect inverse reconstruction, a large number of parameters are required to reconstruct a complex defect, and the corresponding forward modelling simulation is very time-consuming. Such issues result in ill-posed and complex inverse reconstruction results, which further reduces its practical applicability. In this paper, we propose and experimentally validate an inversion technique for the reconstruction of complexly-shaped delamination defects in a multilayered metallic structure using signals derived from infrared thermography (IRT) testing. First, we employ a novel defect parameterization strategy based on Fourier series fitting to represent the profile of a complicated delamination defect with relatively few coefficients. Secondly, the multi-medium element modelling method is applied to enhance a FEM fast forward simulator, in order to solve the mismatching mesh issue for mesh updating during inversion. Thirdly, a deterministic inverse algorithm based on a penalty conjugate gradient algorithm is employed to realize a robust and efficient inverse analysis. By reconstructing delamination profiles with both numerically-simulated IRT signals and those obtained through laser IRT experiments, the validity, efficiency and robustness of the proposed inversion method are demonstrated for delamination defects in a double-layered plate. Based on this strategy, not only is the feasibility of the proposed method in Infrared thermography NDT validated, but the practical applicability of inversion reconstruction analysis is significantly improved.

ACS Style

Haochen Liu; Cuixiang Pei; Shejuan Xie; Yong Li; Yifan Zhao; Zhenmao Chen. Inversion Technique for Quantitative Infrared Thermography Evaluation of Delamination Defects in Multilayered Structures. IEEE Transactions on Industrial Informatics 2019, 16, 4592 -4602.

AMA Style

Haochen Liu, Cuixiang Pei, Shejuan Xie, Yong Li, Yifan Zhao, Zhenmao Chen. Inversion Technique for Quantitative Infrared Thermography Evaluation of Delamination Defects in Multilayered Structures. IEEE Transactions on Industrial Informatics. 2019; 16 (7):4592-4602.

Chicago/Turabian Style

Haochen Liu; Cuixiang Pei; Shejuan Xie; Yong Li; Yifan Zhao; Zhenmao Chen. 2019. "Inversion Technique for Quantitative Infrared Thermography Evaluation of Delamination Defects in Multilayered Structures." IEEE Transactions on Industrial Informatics 16, no. 7: 4592-4602.

Journal article
Published: 23 September 2019 in Sensors
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The cladded conductor is broadly utilized in engineering fields, such as aerospace, energy, and petrochemical; however, it is vulnerable to thickness loss occurring in the clad layer and nonconductive protection coating due to abrasive and corrosive environments. Such a flaw severely undermines the integrity and safety of the mechanical structures. Therefore, evaluating the thickness loss hidden inside cladded conductors via reliable nondestructive evaluation techniques is imperative. This paper intensively investigates the pulse-modulation eddy current technique (PMEC) for the assessment of thickness loss in a cladded conductor. An analytical model of the ferrite-cored probe is established for analyzing PMEC signals and characteristics of lift-off intersection (LOI) in testing signals. Experiments are conducted for evaluation of the thickness loss in cladded conductors. An inverse scheme based on LOI for estimation of the thickness-loss depth is proposed and further verified. Through simulations and experiments, it is found that the influences of the thickness loss in the clad layer and protective coating on the PMEC signals can be decoupled in virtue of the LOI characteristics. Based on LOI, the hidden thickness loss can be efficiently evaluated without much of a reduction in accuracy by using the PMEC probe for dedicated inspection of the cladded conductor.

ACS Style

Yong Li; Yi Wang; Zhengshuai Liu; Ilham Mukriz Zainal Abidin; Zhenmao Chen. Characteristics Regarding Lift-Off Intersection of Pulse-Modulation Eddy Current Signals for Evaluation of Hidden Thickness Loss in Cladded Conductors. Sensors 2019, 19, 4102 .

AMA Style

Yong Li, Yi Wang, Zhengshuai Liu, Ilham Mukriz Zainal Abidin, Zhenmao Chen. Characteristics Regarding Lift-Off Intersection of Pulse-Modulation Eddy Current Signals for Evaluation of Hidden Thickness Loss in Cladded Conductors. Sensors. 2019; 19 (19):4102.

Chicago/Turabian Style

Yong Li; Yi Wang; Zhengshuai Liu; Ilham Mukriz Zainal Abidin; Zhenmao Chen. 2019. "Characteristics Regarding Lift-Off Intersection of Pulse-Modulation Eddy Current Signals for Evaluation of Hidden Thickness Loss in Cladded Conductors." Sensors 19, no. 19: 4102.

Conference paper
Published: 10 June 2019 in IOP Conference Series: Materials Science and Engineering
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Planar conductors are commonly used in critical mechanical structures. Due to high-temperature and high-pressure environment, corrosion may occur in in-service planar conductors, and seriously threatens structural integrity and safety. Hence, it is indispensable to detect and evaluate corrosion using Non-destructive Testing (NDT) techniques before structural failure. As a technique complementary to other Electromagnetic NDT methods, Microwave NDT is found to be advantageous in terms of high efficiency and accuracy in inspection of conductors subject to surface flaws. In this paper, a millimetre-wave probe for efficient detection and evaluation of corrosion in planar conductors is proposed and intensively investigated via simulation. A 3D Finite Element (FE) model of the proposed probe is established based on electromagnetic wave theory. The characteristics of the microwave propagation along with the mechanism regarding corrosion detection are intensively analysed. The probe structure and parameters are subsequently optimised in an effort to enhance the detectability, sensitivity and accuracy in corrosion evaluation. Besides, signal processing techniques involving extraction of features from the S-parameter in the function of frequency are investigated.

ACS Style

Wenjia Li; Yong Li; Jianguo Tan; Ilham Mukriz Zainal Abidin; Jinhua Hu; Zhenmao Chen; Yongzhuo Wu. A Millimetre-wave Probe for Fast Screening and Evaluation of Corrosion in Planar Conductors: Numerical Simulations. IOP Conference Series: Materials Science and Engineering 2019, 554, 012003 .

AMA Style

Wenjia Li, Yong Li, Jianguo Tan, Ilham Mukriz Zainal Abidin, Jinhua Hu, Zhenmao Chen, Yongzhuo Wu. A Millimetre-wave Probe for Fast Screening and Evaluation of Corrosion in Planar Conductors: Numerical Simulations. IOP Conference Series: Materials Science and Engineering. 2019; 554 (1):012003.

Chicago/Turabian Style

Wenjia Li; Yong Li; Jianguo Tan; Ilham Mukriz Zainal Abidin; Jinhua Hu; Zhenmao Chen; Yongzhuo Wu. 2019. "A Millimetre-wave Probe for Fast Screening and Evaluation of Corrosion in Planar Conductors: Numerical Simulations." IOP Conference Series: Materials Science and Engineering 554, no. 1: 012003.

Journal article
Published: 23 May 2019 in NDT & E International
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For the anti-corrosion measure, the nonconductive protection coating is normally deployed over the surface of the conductive structure which is widely utilized in the engineering fields including aerospace, nuclear energy, etc. Nevertheless, due to hostile and corrosive environments, hidden corrosion buried right beneath the non-conductive coating, namely Corrosion Under Coating (CUC) has been found occurring in the conductor surface, and severely undermines the structural integrity. Therefore, it is imperative to non-invasively interrogate CUC via Non-destructive Evaluation (NDE) techniques without removing the protection coating. Pulse-modulation Eddy Current technique (PMEC) has been identified to be advantageous over Pulsed Eddy Current testing (PEC) in higher inspection sensitivity to hidden corrosion and accuracy of corrosion imaging. It could be a promising and preferable NDE technique for evaluation of CUC. In this paper, PMEC for recognition and evaluation of the opening profile of CUC is intensively investigated through simulations and experiments. Based on the Extended Truncated Region Eigenfunction Expansion (ETREE) modelling, closed-form expressions of PMEC responses to CUC are formulated. A series of simulations are conducted to compare the evaluation sensitivity of PMEC to CUC with that of PEC. Following this, experiments for profile recognition and evaluation of CUC via PMEC are conducted. The improved Canny algorithm is proposed to enhance the accuracy in identification and assessment of the CUC profile. The results from simulations and experiments reveal that: (1) PMEC is superior to PEC in terms of evaluation sensitivity to CUC; and (2) in conjunction with the improved Canny algorithm, PMEC is capable of identifying and evaluating the CUC profile without much loss in accuracy.

ACS Style

Bei Yan; Yong Li; Shuting Ren; Ilham Mukriz Zainal Abidin; Zhenmao Chen; Yi Wang. Recognition and evaluation of corrosion profile via pulse-modulation eddy current inspection in conjunction with improved Canny algorithm. NDT & E International 2019, 106, 18 -28.

AMA Style

Bei Yan, Yong Li, Shuting Ren, Ilham Mukriz Zainal Abidin, Zhenmao Chen, Yi Wang. Recognition and evaluation of corrosion profile via pulse-modulation eddy current inspection in conjunction with improved Canny algorithm. NDT & E International. 2019; 106 ():18-28.

Chicago/Turabian Style

Bei Yan; Yong Li; Shuting Ren; Ilham Mukriz Zainal Abidin; Zhenmao Chen; Yi Wang. 2019. "Recognition and evaluation of corrosion profile via pulse-modulation eddy current inspection in conjunction with improved Canny algorithm." NDT & E International 106, no. : 18-28.

Journal article
Published: 21 March 2019 in International Journal of Applied Electromagnetics and Mechanics
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ACS Style

Yong Li; Yi Wang; Bei Yan; Rui Cai; Zhenmao Chen; Ilham Mukriz Zainal Abidin; Haoqing Jing. A hybrid model of capsule-typed electromagnetic acoustic transducers for inspection of tubular conductors. International Journal of Applied Electromagnetics and Mechanics 2019, 59, 1459 -1467.

AMA Style

Yong Li, Yi Wang, Bei Yan, Rui Cai, Zhenmao Chen, Ilham Mukriz Zainal Abidin, Haoqing Jing. A hybrid model of capsule-typed electromagnetic acoustic transducers for inspection of tubular conductors. International Journal of Applied Electromagnetics and Mechanics. 2019; 59 (4):1459-1467.

Chicago/Turabian Style

Yong Li; Yi Wang; Bei Yan; Rui Cai; Zhenmao Chen; Ilham Mukriz Zainal Abidin; Haoqing Jing. 2019. "A hybrid model of capsule-typed electromagnetic acoustic transducers for inspection of tubular conductors." International Journal of Applied Electromagnetics and Mechanics 59, no. 4: 1459-1467.

Original articles
Published: 12 June 2018 in Research in Nondestructive Evaluation
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During fabrication and practical service, nonmagnetic tubes are prone to the External Wall-thickness Loss (EWL) which leaves the tubes vulnerable to structural failure. In this paper, a bobbin-typed electromagnetic acoustic transducer is proposed for tube inspection. The feasibility of EWL evaluation by using the proposed transducer is investigated via simulations and experiments. In order for efficient simulations of Electromagnetic Acoustic Transduction (EMAT), the hybrid modeling integrating the analytical modeling and finite element modeling is established. Closed-form expressions particularly regarding the EMAT-related field quantities of electromagnetics are formulated via the Extended Truncated Region Eigenfunction Expansion (ETREE) modeling. Simulations by using the hybrid model indicate that the proposed transducer is capable of evaluating EWL in nonmagnetic tubes. In parallel, experiments with the fabricated transducer have been carried out. The experimental results are supportive of the conclusion drawn from simulations. From simulations and experiments, it can be found that EWL evaluation with the proposed bobbin-typed electromagnetic acoustic transducer is feasible, which could benefit the real-time and in-situ nondestructive evaluation of nonmagnetic tubes.

ACS Style

Yong Li; Bei Yan; Haoqing Jing; Yi Wang; Jinhua Hu; Zhenmao Chen. Feasibility investigation regarding evaluation of external wall-thickness loss in nonmagnetic tubes using a bobbin-typed electromagnetic acoustic transducer. Research in Nondestructive Evaluation 2018, 30, 287 -302.

AMA Style

Yong Li, Bei Yan, Haoqing Jing, Yi Wang, Jinhua Hu, Zhenmao Chen. Feasibility investigation regarding evaluation of external wall-thickness loss in nonmagnetic tubes using a bobbin-typed electromagnetic acoustic transducer. Research in Nondestructive Evaluation. 2018; 30 (5):287-302.

Chicago/Turabian Style

Yong Li; Bei Yan; Haoqing Jing; Yi Wang; Jinhua Hu; Zhenmao Chen. 2018. "Feasibility investigation regarding evaluation of external wall-thickness loss in nonmagnetic tubes using a bobbin-typed electromagnetic acoustic transducer." Research in Nondestructive Evaluation 30, no. 5: 287-302.

Journal article
Published: 28 May 2018 in Sensors
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For fuel transmission and structural strengthening, small-diameter pipes of nonmagnetic materials are extensively adopted in engineering fields including aerospace, energy, transportation, etc. However, the hostile and corrosive environment leaves them vulnerable to external corrosion which poses a severe threat to structural integrity of pipes. Therefore, it is imperative to nondestructively detect and evaluate the external corrosion in nonmagnetic pipes. In light of this, a capsule-type Electromagnetic Acoustic Transducer (EMAT) for in-situ nondestructive evaluation of nonmagnetic pipes and fast screening of external corrosion is proposed in this paper. A 3D hybrid model for efficient prediction of responses from the proposed transducer to external corrosion is established. Closed-form expressions of field quantities of electromagnetics and EMAT signals are formulated. Simulations based on the hybrid model indicate feasibility of the proposed transducer in detection and evaluation of external corrosion in nonmagnetic pipes. In parallel, experiments with the fabricated transducer have been carried out. Experimental results are supportive of the conclusion drawn from simulations. The investigation via simulations and experiments implies that the proposed capsule-type EMAT is capable of fast screening of external corrosion, which is beneficial to the in-situ nondestructive evaluation of small-diameter nonmagnetic pipes.

ACS Style

Yong Li; Rui Cai; Bei Yan; Ilham Mukriz Zainal Abidin; Haoqing Jing; Yi Wang. A Capsule-Type Electromagnetic Acoustic Transducer for Fast Screening of External Corrosion in Nonmagnetic Pipes. Sensors 2018, 18, 1733 .

AMA Style

Yong Li, Rui Cai, Bei Yan, Ilham Mukriz Zainal Abidin, Haoqing Jing, Yi Wang. A Capsule-Type Electromagnetic Acoustic Transducer for Fast Screening of External Corrosion in Nonmagnetic Pipes. Sensors. 2018; 18 (6):1733.

Chicago/Turabian Style

Yong Li; Rui Cai; Bei Yan; Ilham Mukriz Zainal Abidin; Haoqing Jing; Yi Wang. 2018. "A Capsule-Type Electromagnetic Acoustic Transducer for Fast Screening of External Corrosion in Nonmagnetic Pipes." Sensors 18, no. 6: 1733.

Journal article
Published: 23 April 2018 in IEEE Transactions on Industrial Informatics
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In this paper, a very fast numerical solver for simulating signal perturbation of infrared thermography testing (IRT) due to delamination defects was developed by using database of unflawed IRT information. Firstly, the IRT signal simulation method of the frequency domain summation scheme proposed by authors is briefly introduced as the bases of the present fast forward solver. Second, a database-type fast numerical scheme for rapid simulation of single frequency IRT harmonic signals was proposed to enhance the efficiency of the IRT simulation without worsening the numerical precision. In addition, in order to efficiently implement the proposed fast solver for simulation of delamination defects in a multilayered plate, a 2D shifting symmetry strategy was applied to reduce the computational burden for the construction of the unflawed database. Based on the proposed scheme, a fast forward numerical code was developed for simulation of IRT signal perturbation due to the delamination defect. The validity of the proposed scheme and the corresponding numerical code was verified by comparing its results with those of a full-FEM code and experiments. It was demonstrated that the database-type fast scheme can significantly reduce the simulation time for the IRT signal perturbation due to a delamination defect but keep the same simulation accuracy with that of the full-FEM code.

ACS Style

Haochen Liu; Shejuan Xie; Cuixiang Pei; Jinxing Qiu; Yong Li; Liu Haochen. Development of a Fast Numerical Simulator for Infrared Thermography Testing Signals of Delamination Defect in a Multilayered Plate. IEEE Transactions on Industrial Informatics 2018, 14, 5544 -5552.

AMA Style

Haochen Liu, Shejuan Xie, Cuixiang Pei, Jinxing Qiu, Yong Li, Liu Haochen. Development of a Fast Numerical Simulator for Infrared Thermography Testing Signals of Delamination Defect in a Multilayered Plate. IEEE Transactions on Industrial Informatics. 2018; 14 (12):5544-5552.

Chicago/Turabian Style

Haochen Liu; Shejuan Xie; Cuixiang Pei; Jinxing Qiu; Yong Li; Liu Haochen. 2018. "Development of a Fast Numerical Simulator for Infrared Thermography Testing Signals of Delamination Defect in a Multilayered Plate." IEEE Transactions on Industrial Informatics 14, no. 12: 5544-5552.

Journal article
Published: 31 July 2017 in Sensors
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A corrosive environment leaves in-service conductive structures prone to subsurface corrosion which poses a severe threat to the structural integrity. It is indispensable to detect and quantitatively evaluate subsurface corrosion via non-destructive evaluation techniques. Although the gradient-field pulsed eddy current technique (GPEC) has been found to be superior in the evaluation of corrosion in conductors, it suffers from a technical drawback resulting from the non-uniform field excited by the conventional pancake coil. In light of this, a new GPEC probe with uniform field excitation for the imaging of subsurface corrosion is proposed in this paper. The excited uniform field makes the GPEC signal correspond only to the field perturbation due to the presence of subsurface corrosion, which benefits the corrosion profiling and sizing. A 3D analytical model of GPEC is established to analyze the characteristics of the uniform field induced within a conductor. Following this, experiments regarding the imaging of subsurface corrosion via GPEC have been carried out. It has been found from the results that the proposed GPEC probe with uniform field excitation not only applies to the imaging of subsurface corrosion in conductive structures, but provides high-sensitivity imaging results regarding the corrosion profile and opening size.

ACS Style

Yong Li; Shuting Ren; Bei Yan; Ilham Mukriz Zainal Abidin; Yi Wang. Imaging of Subsurface Corrosion Using Gradient-Field Pulsed Eddy Current Probes with Uniform Field Excitation. Sensors 2017, 17, 1747 .

AMA Style

Yong Li, Shuting Ren, Bei Yan, Ilham Mukriz Zainal Abidin, Yi Wang. Imaging of Subsurface Corrosion Using Gradient-Field Pulsed Eddy Current Probes with Uniform Field Excitation. Sensors. 2017; 17 (8):1747.

Chicago/Turabian Style

Yong Li; Shuting Ren; Bei Yan; Ilham Mukriz Zainal Abidin; Yi Wang. 2017. "Imaging of Subsurface Corrosion Using Gradient-Field Pulsed Eddy Current Probes with Uniform Field Excitation." Sensors 17, no. 8: 1747.

Journal article
Published: 25 April 2017 in Sensors
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Coated conductive structures are widely adopted in such engineering fields as aerospace, nuclear energy, etc. The hostile and corrosive environment leaves in-service coated conductive structures vulnerable to Hidden Material Degradation (HMD) occurring under the protection coating. It is highly demanded that HMD can be non-intrusively assessed using non-destructive evaluation techniques. In light of the advantages of Gradient-field Pulsed Eddy Current technique (GPEC) over other non-destructive evaluation methods in corrosion evaluation, in this paper the GPEC probe for quantitative evaluation of HMD is intensively investigated. Closed-form expressions of GPEC responses to HMD are formulated via analytical modeling. The Lift-off Invariance (LOI) in GPEC signals, which makes the HMD evaluation immune to the variation in thickness of the protection coating, is introduced and analyzed through simulations involving HMD with variable depths and conductivities. A fast inverse method employing magnitude and time of the LOI point in GPEC signals for simultaneously evaluating the conductivity and thickness of HMD region is proposed, and subsequently verified by finite element modeling and experiments. It has been found from the results that along with the proposed inverse method the GPEC probe is applicable to evaluation of HMD in coated conductive structures without much loss in accuracy.

ACS Style

Yong Li; Haoqing Jing; Ilham Mukriz Zainal Abidin; Bei Yan. A Gradient-Field Pulsed Eddy Current Probe for Evaluation of Hidden Material Degradation in Conductive Structures Based on Lift-Off Invariance. Sensors 2017, 17, 943 .

AMA Style

Yong Li, Haoqing Jing, Ilham Mukriz Zainal Abidin, Bei Yan. A Gradient-Field Pulsed Eddy Current Probe for Evaluation of Hidden Material Degradation in Conductive Structures Based on Lift-Off Invariance. Sensors. 2017; 17 (5):943.

Chicago/Turabian Style

Yong Li; Haoqing Jing; Ilham Mukriz Zainal Abidin; Bei Yan. 2017. "A Gradient-Field Pulsed Eddy Current Probe for Evaluation of Hidden Material Degradation in Conductive Structures Based on Lift-Off Invariance." Sensors 17, no. 5: 943.

Journal article
Published: 29 December 2016 in International Journal of Applied Electromagnetics and Mechanics
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ACS Style

Yong Li; Bei Yan; Da Li; Yili Li; Zhenmao Chen. Pulse-modulation-based eddy current technique for non-destructive evaluation of conductive structures with subsurface corrosion. International Journal of Applied Electromagnetics and Mechanics 2016, 52, 347 -356.

AMA Style

Yong Li, Bei Yan, Da Li, Yili Li, Zhenmao Chen. Pulse-modulation-based eddy current technique for non-destructive evaluation of conductive structures with subsurface corrosion. International Journal of Applied Electromagnetics and Mechanics. 2016; 52 (1-2):347-356.

Chicago/Turabian Style

Yong Li; Bei Yan; Da Li; Yili Li; Zhenmao Chen. 2016. "Pulse-modulation-based eddy current technique for non-destructive evaluation of conductive structures with subsurface corrosion." International Journal of Applied Electromagnetics and Mechanics 52, no. 1-2: 347-356.

Journal article
Published: 13 July 2016 in IEEE Magnetics Letters
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A thermal barrier coating (TBC), consisting of the top and bond coatings, is normally deployed over the alloying body of an aeroengine blade in order to protect the blade from hostile environments. Thickness loss of TBC severely undermines the structural integrity of blades, and thus leads to the failure of aeroengines. Before catastrophic accidents occur, it is important to nonintrusively assess the TBC thickness via effective nondestructive evaluation (NDE) techniques. In this letter, the dual-frequency eddy current technique (DFEC) in conjunction with an efficient inverse model is intensively investigated for quantitative evaluation of TBC thickness in micrometers. The thickness of both top and bond coatings are assessed simultaneously. Comparison between the estimated TBC thickness of blade specimens and true values acquired using scanning electron microscope (SEM) indicates that DFEC is applicable for quantitative evaluation of TBC thickness without much loss of accuracy.

ACS Style

Yong Li; Bei Yan; Wenjia Li; Da Li. Thickness Assessment of Thermal Barrier Coatings of Aeroengine Blades Via Dual-Frequency Eddy Current Evaluation. IEEE Magnetics Letters 2016, 7, 1 -5.

AMA Style

Yong Li, Bei Yan, Wenjia Li, Da Li. Thickness Assessment of Thermal Barrier Coatings of Aeroengine Blades Via Dual-Frequency Eddy Current Evaluation. IEEE Magnetics Letters. 2016; 7 ():1-5.

Chicago/Turabian Style

Yong Li; Bei Yan; Wenjia Li; Da Li. 2016. "Thickness Assessment of Thermal Barrier Coatings of Aeroengine Blades Via Dual-Frequency Eddy Current Evaluation." IEEE Magnetics Letters 7, no. : 1-5.

Journal article
Published: 06 May 2014 in International Journal of Applied Electromagnetics and Mechanics
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ACS Style

Yong Li; Xiangbiao Liu; Zhenmao Chen; Hongda Zhao; Wenlu Cai. A fast forward model of pulsed eddy current inspection of multilayered tubular structures. International Journal of Applied Electromagnetics and Mechanics 2014, 45, 417 -423.

AMA Style

Yong Li, Xiangbiao Liu, Zhenmao Chen, Hongda Zhao, Wenlu Cai. A fast forward model of pulsed eddy current inspection of multilayered tubular structures. International Journal of Applied Electromagnetics and Mechanics. 2014; 45 (1-4):417-423.

Chicago/Turabian Style

Yong Li; Xiangbiao Liu; Zhenmao Chen; Hongda Zhao; Wenlu Cai. 2014. "A fast forward model of pulsed eddy current inspection of multilayered tubular structures." International Journal of Applied Electromagnetics and Mechanics 45, no. 1-4: 417-423.

Journal article
Published: 05 March 2013 in International Journal of Applied Electromagnetics and Mechanics
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ACS Style

Deqiang Zhou; Yong Li; Xiangyang Yan; Lihua You; Qiuju Zhang; Xiangbiao Liu; Yong Qi. The investigation on the optimal design of rectangular PECT probes for evaluation of defects in conductive structures. International Journal of Applied Electromagnetics and Mechanics 2013, 42, 319 -326.

AMA Style

Deqiang Zhou, Yong Li, Xiangyang Yan, Lihua You, Qiuju Zhang, Xiangbiao Liu, Yong Qi. The investigation on the optimal design of rectangular PECT probes for evaluation of defects in conductive structures. International Journal of Applied Electromagnetics and Mechanics. 2013; 42 (2):319-326.

Chicago/Turabian Style

Deqiang Zhou; Yong Li; Xiangyang Yan; Lihua You; Qiuju Zhang; Xiangbiao Liu; Yong Qi. 2013. "The investigation on the optimal design of rectangular PECT probes for evaluation of defects in conductive structures." International Journal of Applied Electromagnetics and Mechanics 42, no. 2: 319-326.