Optimization of Flexible Eddy Current Patterns with Low Sensitivity to Lift-Off

International audienceEddy Current is a powerful mean of detection of defects located close to the surface in conductive parts. The use of winding coils has shown good efficiency and gave good results in lots of applications. Nevertheless, it reveals some limits in some cases, when the part has a complex shape for instance. Therefore, other technologies are investigated such as coils etched on kapton film. Thanks to this technology, it is possible to design efficient probes with a low sensitivity to lift-off, on the one hand thanks to the flexibility of the sensor, and on the other hand thanks to the intrinsic design of the pattern. The paper presents the method to optimize these two patterns and a comparison between simulation data and experimental data

Development of flexible array eddy current probes for complex geometries and inspection of magnetic parts using magnetic sensors

39th Annual Review of Progress in Quantative Nondestructive Evaluation (QNDE), Denver, CO, JUL 15-20, 2012International audienceEddy Current Technique is a powerful method of inspection of metal parts. When size of flaws decreases, inspection areas become hardly accessible or material is magnetic, traditional winding coil probes are less efficient. Thanks to new CIVA simulation tools, we have designed and optimized advanced EC probes: flexible EC probe based on micro-coil arrays and EC probe with magnetic sensors, including specific electronics

Development of eddy current probes based on magnetoresistive sensors arrays

Conference of 40th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2013, Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics, ICBM 2013 ; Conference Date: 21 July 2013 Through 26 July 2013; Conference Code:105840International audienceEddy Current Technique is a powerful method for detection of surface notches and of buried flaws during inspection of metallic parts. Recent EC array probes have demonstrated a fast and efficient control of large surfaces. Nevertheless, when the size of flaws decreases or the defect is rather deep, traditional winding coil probes turn out to be useless. Magnetoresistive sensors present the advantages of flat frequency response and micron size. These sensors are hence very attractive for the detection of buried defects that require low frequencies because of skin depth effect. An optimization of the probe with magnetoresistive sensors as receivers has been made by simulations using CIVA software and finite elements methods with OPERA. EC probes for buried flaw detection have been designed. Experimental results have been compared with simulations

Water resource management: the multi-technique approach of LSBB and its muon detection projects (chapter 7)

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