Dual frequency fusion for defect signal enhancement in EC-GMR inspecton of riveted multilayer structures |
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| Affiliation: | 1. Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China;2. School of Materials and Chemical Engineering, Hainan University, Haikou 570228, China;1. University Mohammed V of Rabat, EST- LASTIMI, Salé, B.P. 227, Salé-Medina, Morocco;2. University Mohammed V of Rabat, EST- LEME, Salé, B.P. 227, Salé-Medina, Morocco;3. University Mohammed V of Rabat, Faculty of Sciences, UFR-ATI, BP 1014, Rabat, Morocco;1. Department of Physics, University of Warwick, Coventry, CV4 7AL, UK;2. Department of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UK;3. Department of Aerospace Engineering & Engineering Mechanics, University of Cincinnati, Cincinnati, OH 45221, USA;1. Department of Mechanical Engineering, Villanova University, Villanova, PA 19085, USA;2. Department of Electrical and Computer Engineering, Temple University, Philadelphia, PA 19122, USA;3. Center for Advanced Communications, College of Engineering, Villanova University, Villanova, PA 19085, USA |
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| Abstract: | Reliable detection of defects under fasteners at rivet sites is one of the most critical problems in inspection of multilayer structures. Rotating eddy current (EC) excitation with giant magnetoresistive (GMR) sensor array field pick up (EC-GMR) has proved to be a promising approach in this application. In this paper, fusion of dual frequency is applied to EC-GMR scan data acquired with a novel differential array probe, to suppress the strong fastener response and hence improve the detectability of defects. Performance of the data fusion algorithm is evaluated on a two-layer aluminum sample with steel fasteners and notches introduced in the bottom layer using the electric discharge machine (EDM). Experimental results demonstrate that defects of different sizes can be successfully detected by evaluating the residual field after fusion. Defect orientation angle has minimal impact on the sensitivity of the probe owing to rotating eddy current excitation. |
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