General analysis of inductive sensor based systems for non destructive testing

Abstract

This paper presents a general view of the Non Destructive Testing (NDT) systems based on the use of inductive sensors where the potential users are likely to be more and more numerous. We describe the different phases of their conception. Firstly, we analyse the physical interaction between the sensor and the specimen material by the use of an enlarged concept of electrical images. The instrumentation problem is next reviewed by analysing the signals which are supplied by these sensors, and by the way leading to the definition of the differing range of applications of such sensors. Finally, we enumerate the various signal processing techniques usually applied in NDT and based on the general inversion techniques.