期刊
INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
卷 59, 期 4, 页码 1247-1255出版社
IOS PRESS
DOI: 10.3233/JAE-171193
关键词
Eddy current; CFRP; TMR
This paper presents an eddy current (EC) probe with orthogonal excitation coils that can change the exciting current direction electrically and tunnel magnetoresistive (TMR) sensor for inspection of stacked CFRP. As CFRP is electrically anisotropic, eddy current excited along the fiber direction is stronger than in other directions. A high sensitivity TMR sensor located at the center of the two orthogonal coils measures the z component of induced magnetic field (Bz) which constitutes the probe signal. The output of the sensor is 0 if the induced currents are symmetric about the sensor. Signals of defects in different orientations depend on the direction of the exciting current. The operation of the probe is validated using a finite element model. A prototype was built and experimental results from CFRP sample with defects in different orientations are presented and analyzed.
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