Optimal Design of Remote Field Eddy Current Sensor for Detection of Cracks in Riveted Structure

doi:10.3901/JME.2017.14.120

Abstract

Abstract: Since the complexity and large thickness of the fuselage riveted structure, it is difficult to detect its cracks by traditional eddy current testing technology. Without the restriction of skin effect, remote field eddy current can penetrate specimen with large thickness, and has potential to detect cracks in riveted structure. In order to realize remote field eddy current effect in riveted structure, a new remote field eddy current sensor is designed from the aspects of signal enhancement and magnetic suppression. On one hand, magnetic circuit is added to the excitation coil for collection and guidance of excitation magnetic field, enhancing indirect coupling magnetic field; On the other hand, suppression unit is equipped between the excitation coil and the detection coil to restrain direct coupling magnetic field. Remote field eddy current effect is realized through the co-work of signal enhancement and magnetic suppression. Focusing on the design of sensor, many simulations have been carried out on the shape, size and material of the signal enhancement and magnetic suppression unit, and the optimal design is obtained. Simulation and experiments results verify the feasibility of the application of remote field eddy current testing technology in the location detection of cracks in riveted structure.

Key words: magnetic suppression, remote field eddy current, riveted structure, signal enhancement

CLC Number:

TG115

XU Junmin, YANG Binfeng, WANG Xiaofeng, ZHANG Hui. Optimal Design of Remote Field Eddy Current Sensor for Detection of Cracks in Riveted Structure[J]. Journal of Mechanical Engineering, 2017, 53(14): 120-127.

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