SURFACE MAGNETIC NON DESTRUCTIVE EVALUATION USING A PERMEABILITY SENSOR BASED ON THE MDL TECHNIQUE

Evangelos Hristoforou – Konstantinos Kosmas – Mojmír Kollár

   In this paper we present a method for non destructive testing of ferromagnetic material surfaces. The method is based on the magnetostrictive delay line (MDL) technique. According to this technique a type of balanced MDL structure is used to determine the magnetic permeability of ferromagnetic surface. The distribution of the measured permeability may be used to determine the plastic deformation of the surface under inspection.

Keywords: magnetic non destructive evaluation, magnetic permeability, magnetostrictive delay lines

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