Algunas Particularidades de la Detección de Grietas por Corrientes de Remolino utilizando una Configuración Asimétrica GMR-Bobina (Some Particularities of EC Crack Detection in Aluminum using an Asymmetrical GMR-Coil Configuration)

Eduardo Ramirez Pacheco (e_ri_pa@hotmail.com)1, José Hiram Espina Hernández (jhespina@gmail.com)1, José Alberto Pérez Benítez (benitez_edl@yahoo.es)1, Francisco Caleyo Cereijo (fcaleyo@gmail.com)1, José Manuel Hallen López (j_hallen@yahoo.com)1


1Instituto Politécnico Nacional

This paper appears in: Revista IEEE América Latina

Publication Date: May 2015
Volume: 13,   Issue: 5 
ISSN: 1548-0992


Abstract:
This paper presents experimental results related to an asymmetrical coil ‑ GMR configuration for the detection of surface cracks using eddy currents. The system is evaluated for three different excitation frequencies and the relationship between the extracted parameter (DV) from the GMR output voltage and the crack's dimension is validated. The analysis of the presence of the intermediate peak in the output voltage of the GMR sensor is performed. The stability of the excitation current source is presented and it is demonstrated that the presence of the intermediate peak does not have a significant influence on the relationship of DV with the depth of the crack.

Index Terms:
eddy currents, giant magnetoresistance (GMR), coil, crack aluminum   


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