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Title: GMR array uniform eddy current probe for defect detection in conductive specimens
Authors: Postolache, O.
Ribeiro, A. L.
Ramos, H. G.
Keywords: Non-destructive testing
Uniform eddy current probe
Giant magneto-resistance sensors array
Sensor biasing
2D Template matching
Issue Date: Dec-2013
Publisher: Elsevier
Abstract: In this work an optimized uniform eddy current probe architecture including two planar excitation coils, a rectangular magnetic field biasing coil and a GMR magnetometer sensor array is presented. An ac current is applied to the planar spiral rectangular coil of the probe, while a set of GMR magnetometer sensors detects the induced magnetic field in the specimens under test. The rectangular coil provides the DC uniform magnetic field, assuring appropriate biasing of the GMR magnetometers of the probe, setting-up the functioning point on the linear region and at the same branch of the GMR static characteristics. The differences on the images obtained for the same specimen for each GMR are reduced if all sensors are biased on the same working point. Elements of the automated measurement system used to inspect the plate under test using the proposed eddy current probe, including a validation procedure based on a 2D template matching algorithm and the corresponding experimental results are included in the paper
Description: WOS:000326270400068 (Nº de Acesso Web of Science)
Peer reviewed: Sim
ISSN: 0263-2241
Publisher version: The definitive version is available at:
Appears in Collections:CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica
IT-RI - Artigo em revista internacional com arbitragem científica

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