Eddy-current testing probe with spin-valve type GMR sensor for printed circuit board inspection

This paper proposes an eddy-current testing (ECT) probe composed of a spin-valve giant magnetoresistance (SV-GMR) sensor and a meander coil for the inspection of bare printed circuit board. The SV-GMR sensor serves as a magnetic sensor for the ECT probe to sense the variation of the magnetic field d...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2004-07, Vol.40 (4), p.2676-2678
Main Authors: Yamada, S., Chomsuwan, K., Fukuda, Y., Iwahara, M., Wakiwaka, H., Shoji, S.
Format: Article
Language:English
Subjects:
Circuit testing
Coils
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electrical capacitance tomography
Exact sciences and technology
Giant magnetoresistance
Inspection
Magnetic properties and materials
Magnetic sensors
Magnetism
Physics
Printed circuits
Probes
Sensor phenomena and characterization
Signal to noise ratio
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Summary:This paper proposes an eddy-current testing (ECT) probe composed of a spin-valve giant magnetoresistance (SV-GMR) sensor and a meander coil for the inspection of bare printed circuit board. The SV-GMR sensor serves as a magnetic sensor for the ECT probe to sense the variation of the magnetic field distribution occurred on the printed circuit board. The SV-GMR sensor is used specifically to detect the changing magnetic field distribution occurred at the defect point. The characteristics of the proposed probe are discussed in this paper. The comparisons of signal-to-noise ratios obtained from ECT probe with SV-GMR sensor and with solenoid coil verify that the applying of SV-GMR sensor to the ECT probe can improve the PCB inspection results.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2004.829254