Abstract
In the field of electromagnetic nondestructive testing, inductive (eddy current) imaging technique is used for the inspection of metallic conductors, while capacitive imaging technique is used on non-conductors. This paper proposed a novel capacitive/inductive dual modality sensor, which can detect defects both in insulation materials and on conducting surfaces. The information of defects on the conducting surface and in the non-conducting layer of the tested specimen can be obtained simultaneously by the proposed sensor with its mode controlled by electronic switches. Finite Element models constructed in COMSOL were used to obtain point spread functions of the sensor in both capacitive and inductive modes. In this paper, the capacitance/inductive imaging experiments were carried out on a fibre glass-aluminium hybrid structure contains various defects. The defect shape can be detected by real-time imaging, and the defects on the conducting surface and in the non-conductor layer can be distinguished by data analysis of the experimental results.
How to Cite:
Fu, J. ., Yin, X. ., Li, W. . & Chen, G. ., (2019) “A dual modality coplanar electromagnetic sensor for non-destructive evaluation application”, Review of Progress in Quantitative Nondestructive Evaluation .
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