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

Author

Yamada, S. ; Chomsuwan, K. ; Fukuda, Y. ; Iwahara, M. ; Wakiwaka, H. ; Shoji, S.

Author_Institution

Inst. of Nature & Environ. Technol., Kanazawa Univ., Japan

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2676

Lastpage

2678

Abstract

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.

Keywords

eddy current testing; giant magnetoresistance; inspection; magnetic sensors; printed circuit testing; spin valves; test equipment; SV-GMR sensor; eddy-current testing probe; magnetic field distribution; magnetic sensor; meander coil; printed circuit board inspection; signal-to-noise ratio; solenoid coil; spin-valve giant magnetoresistance; Circuit testing; Coils; Electrical capacitance tomography; Giant magnetoresistance; Inspection; Magnetic sensors; Printed circuits; Probes; Sensor phenomena and characterization; Signal to noise ratio; ECT; Eddy-current testing; SV-GMR; printed circuit board inspection; signal-to-noise ratio; spin-valve giant magnetoresistance;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.829254

Filename

1325606