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Vol.7 No.1previous AASP14 (87-88-89-90-91-92-93-94-95-96-97-

Academic Articles
Regular Paper Vol.7 No.1 (2015) p.59 - p.65

Developments of Flat ∞ Coil for Defect Searching in the Curved Surfaces

Kouki MARUYAMA1, Iliana MARINOVA2, Yoshifuru SAITO1

1 Graduate School of Electrical Engineering Hosei University, 3-7-2 Kajino, Koganei, Tokyo 184-8584, Japan
2 Technical University of Sofia 1756, Bulgaria


Previously we have succeeded in developing a new ECT sensor called ∞ coil. This new ECT sensor is a relatively high sensibility and has the high liftoff characteristics compared with that of conventional ECT sensor.
However, the ∞ coil confronts to a serious difficulty to apply the curved surface specimens. To overcome this difficulty, this paper has worked out a flat ∞ coil. This flat ∞ coil exhibits a high sensitivity not only to the curved surface but also to the flat surface specimens because of its highly shape flexibility to fit the curved target surface and widely spreader-able exciting coils.
Intensive numerical simulations employing 3D FEM have been carried to show the usefulness of the flat ∞ coil. The experimented results have verified the validity of the numerical simulations. Thus, we have confirmed the versatile capabilities of the flat ∞ coil.


Eddy current, Non-destructive Testing, Flat ∞ coil, curved surface
Full Paper: PDF EJAM Vol.7No.1 pp.59-65 "Developments of Flat ∞ Coil for Defect Searching in the Curved Surfaces"
Article Information
Article history:
Received 13 August 2014
Accepted 26 February 2015