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Zhou D.,Jiangnan University | Zhou D.,Key Laboratory for Advanced Food Manufacturing Equipment Technology of Jiangsu Province | Wang J.,Jiangnan University | Wu J.,Jiangnan University | And 3 more authors.
Insight: Non-Destructive Testing and Condition Monitoring | Year: 2016

To further improve the defect detectability of pulsed eddy current testing (PECT), this paper proposes a rectangular differential probe. Based on finite element method (FEM) simulation, the distribution of a magnetic field on samples under a rectangular testing coil was analysed and a related differential testing method was proposed. Through FEM simulations, the defect detectability between differential and directional testing was compared on three kinds of material, namely aluminium, iron and carbon fibre-reinforced plastic (CFRP). Experimental studies were carried out to verify the validity and accuracy of the simulation results. Both the simulation and experimental results show that PECT, with the help of the rectangular differential probe, can effectively improve the sensitivity of defect detection and does not require reference signals. © 2016 The British Institute of Non-Destructive Testing. Source


Wu J.,Jiangnan University | Wu J.,Key Laboratory for Advanced Food Manufacturing Equipment Technology of Jiangsu Province | Zhou D.,Jiangnan University | Zhou D.,Key Laboratory for Advanced Food Manufacturing Equipment Technology of Jiangsu Province | And 3 more authors.
Journal of Sensors | Year: 2014

Aiming at the surface defect inspection of carbon fiber reinforced composite, the differential and the direct measurement finite element simulation models of pulsed eddy current flaw detection were built. The principle of differential pulsed eddy current detection was analyzed and the sensitivity of defect detection was compared through two kinds of measurements. The validity of simulation results was demonstrated by experiments. The simulation and experimental results show that the pulsed eddy current detection method based on rectangular differential probe can effectively improve the sensitivity of surface defect detection of carbon fiber reinforced composite material. © 2014 Jialong Wu et al. Source


Zhou D.,Jiangnan University | Zhou D.,Key Laboratory for Advanced Food Manufacturing Equipment Technology of Jiangsu Province | Zhou D.,Wuxi G.S Precision Tool Co. | Wu J.,Jiangnan University | And 11 more authors.
Studies in Applied Electromagnetics and Mechanics | Year: 2015

Aiming at detection of defects in ferromagnetic and non-ferromagnetic metals, the finite element models of circular probes with vacuum and non-vacuum shieldings were built. In the presence of flaws, distribution of eddy currents and magnetic field for two kinds of metal materials were simulated. The validity of simulation analysis was demonstrated by experimental results. The results show that the pulsed eddy current with vacuum magnetic shielding can improve effectively the sensitivity on surface defects of ferromagnetic metals. However, it is not obvious that it is incapable of improving the sensitivity of the non-ferromagnetic metal defects and internal defects of ferromagnetic metal defects. © 2015 The authors and IOS Press. All rights reserved. Source


Zhou D.,Key Laboratory for Advanced Food Manufacturing Equipment Technology of Jiangsu Province | Zhou D.,Jiangnan University | Zhou D.,Wuxi G.S Precision Tool Co. | Wu J.,Key Laboratory for Advanced Food Manufacturing Equipment Technology of Jiangsu Province | And 7 more authors.
Chinese Journal of Sensors and Actuators | Year: 2015

In order to evaluate impact damage of carbon fiber reinforced plastic (CFRP), the method of PEC based on magnetic field of y component is proposed. The influence of conductivity differences on the eddy current magnetic field is analyzed by finite simulation. The simulation results are demonstrated by experiments using the method of wavelet packet energy analysis. Simulation and experimental results show that the method of PEC based on magnetic field of y component can effectively identify defect caused by impact energy, and characterize the damages caused by different impact energy. ©, 2015, The Editorial Office of Chinese Journal of Sensors and Actuators. All right reserved. Source

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