Micro eddy current testing by micro magnetic sensor array

Author

Uesaka, M. ; Nakanishi, Tetsuya ; Miya, K. ; Komatsu, Hiroyoshi ; Aoki, Kazuo ; Kasai, Keisuke

Author_Institution

Nucl. Eng. Res. Lab., Tokyo Univ., Japan

Volume

31

Issue

1

fYear

1995

Firstpage

870

Lastpage

876

Abstract

A micro Eddy Current Testing (ECT) system for planar thin specimens made of INCONEL 600 with flaws was proposed and developed. A micro ECT probe used here consists of a conventional pancake-type coil as an exciting coil and a micro magnetic sensor array as a set of pickup coils. Magnetic field perturbation due to a flaw was measured with high spatial resolution and signal-to-noise (S/N) ratio. The measured signals from the array were compared with numerical results obtained by a three-dimensional A-/spl psi/ code. It was confirmed that the micro ECT system has the potential to evaluate the length and depth of a flaw with better accuracy than that of a conventional pancake-type ECT in the steam generator tubings in a pressurized water nuclear reactor.<>

Keywords

eddy current testing; magnetic sensors; INCONEL 600; conventional pancake-type coil; magnetic field perturbation; micro eddy current testing; micro magnetic sensor array; pickup coils; planar thin specimens; pressurized water nuclear reactor; steam generator tubings; three-dimensional A-/spl psi/ code; Coils; Eddy current testing; Eddy currents; Electrical capacitance tomography; Magnetic field measurement; Magnetic sensors; Nuclear power generation; Probes; Sensor arrays; Spatial resolution;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.364584

Filename

364584