Analytical model for tilted coils in eddy-current nondestructive inspection

Author

Theodoulidis, Theodoros

Author_Institution

Energy Dept., West Macedonia Univ., Kozani, Greece

Volume

41

Issue

9

fYear

2005

Firstpage

2447

Lastpage

2454

Abstract

The electromagnetic field and impedance of a cylindrical eddy-current probe coil are calculated analytically for arbitrary coil orientation above a conductive half-space. The remarkably simple closed-form expressions are provided as a function of coil tilt angle. The effect of tilt on the impedance change produced by a long crack is also investigated by combining the analytical model with an existing thin-skin theory for surface crack inspections. Results for both cracked and uncracked conductors are expected to be useful for evaluation of movement-generated noise in eddy-current inspections.

Keywords

coils; crack detection; eddy current testing; electric impedance; electromagnetic fields; surface cracks; analytical model; closed-form expressions; coil orientation; coil tilt; crack inspection; cracked conductors; eddy-current inspections; eddy-current probe coil; eddy-current testing; electromagnetic field; impedance calculation; movement-generated noise; nondestructive inspection; surface crack inspections; thin-skin theory; tilted coils; uncracked conductors; Analytical models; Closed-form solution; Coils; Conductors; Electromagnetic analysis; Electromagnetic fields; Inspection; Probes; Surface cracks; Surface impedance; Coil tilt; crack inspection; eddy currents; eddy-current testing; impedance calculation;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2005.854331

Filename

1506914