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14 November 1996 Probe design for edge-effect reduction in eddy current inspection
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Eddy current methods are used extensively in the nondestructive testing of aircraft structures and parts. One of the challenging problems in the inspection of aircraft structures is the detection of flaws in multi-layer geometries in the vicinity of edges. Very often the large contribution to the signal from the edges mask the information related to the defects. The design of new eddy current probes for reducing edge effects is therefore of significant interest. This paper investigates the design of a new eddy current probe for eliminating the edge effect. A simple method to focus the field is devised using a combination of two coils. The total field distribution is controlled by choosing the coil geometry and coil currents appropriately. Both the magnitude and phase of the currents in the tow coils are varied in order to obtain the desired flux pattern. The efficiency of these probe designs is demonstrated using finite element models. The probe parameters are optimized using finite element predictions. A probe built on the basis of this study is used to demonstrate experimentally the feasibility of the approach.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sarit Sharma, Ibrahim M. Elshafiey, Lalita Udpa, and Satish S. Udpa "Probe design for edge-effect reduction in eddy current inspection", Proc. SPIE 2945, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware, (14 November 1996);

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