Eddy current density by inversion of one measured component of the resulting magnetic field perturbation

Issue title: Proceedings from the 17th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2015)

Guest editors: Fumio Kojima, Futoshi Kobayashi and Hiroyuki Nakamoto

Article type: Research Article

Authors: Pasadas, Dário | Ribeiro, A. Lopes^* | Ramos, Helena | Rocha, Tiago

Affiliations: Instituto de Telecomunicações, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal

Correspondence: [*] Corresponding author: A. Lopes Ribeiro, Instituto de Telecomunicações, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-00 Lisboa, Portugal. E-mail:arturlr@tecnico.ulisboa.pt

Abstract: In this paper we present a method to determine the current density inside an aluminum plate using eddy current testing procedure to determine the existence of surface cracks. The general idea consists in generating eddy currents in the plate, which in the case of flawless material, must be of uniform density pointing along a pre-defined direction inside a given area on the plate surface. These currents are produced using a planar coil. The eddy current density is determined by inversion of the data obtained from the measurement of a single component of the resultant magnetic field. Tikhonov regularization is applied to the inverted data.

Keywords: Eddy current testing, inverse problem, Tikhonov regularization

DOI: 10.3233/JAE-162066

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 35-40, 2016