Eddy-current {NDE} of combustion turbine blade coatings. Determination of conductivity profiles in the presence of a diffusion process

Frédéric Nouguier (1) , Marc Lambert (1) , Riadh Zorgati (1)

1 L2S - Laboratoire des signaux et systèmes

This paper deals with the estimation of conductivity profiles using Eddy- Current measurements over combustion turbine blade coatings affected by depletion of aluminium. First, we model the response of an Eddy-Current coil over a layered metallic structure with a top over-aluminized coating by extending the analytical Uzal-Rose's model for one hyperbolic tangent conductivity profile to a conductivity profile using two hyperbolic tangents for taking inward and outward depletion of aluminum inside the coating into account. Results obtained with this model are similar to those obtained with a numerical multi-layer model with a reduced computing time.

Domaines: Electromagnétisme

Frédéric Nouguier, Marc Lambert, Riadh Zorgati. Eddy-current {NDE} of combustion turbine blade coatings. Determination of conductivity profiles in the presence of a diffusion process. Y.-K. Shin and H.-B. Lee and S.-J. Song. Electromagnetic Non--Destructive Evaluation (XII), IOS Press, pp.91--98, 2009, Studies in Applied Electromagnetics and Mechanics, ⟨10.3233/978-1-60750-023-0-91⟩. ⟨hal-00433483⟩