Abstract
This paper proposes the utilization of a GMR sensor as a magnetic sensor of an eddy-current testing probe for the detection of defects in printed circuit boards. The proposed probe consists of a meander coil functioning as an exciting coil and a GMR sensor functioning as a magnetic sensor. The GMR sensor has the advantages of high sensitivity to low magnetic fields over a broad range of frequency and very small size, and is therefore very useful for detecting very small cracks in printed circuit boards by means of the eddy-current testing technique. This paper describes the structure of the proposed probe, the inspection principles, and the experimental results achieved with an eddy-current testing probe using a GMR sensor in comparison with one using a solenoid coil senso
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