Traitement du signal appliqué aux mesures mécaniques du guide d'ondes hélicoïdal

The authors describe a new measurement method which characterizes the second order statistical properties of the difference between the actual radius of the manufactured helix waveguide and the constant radius of a perfectly cylindrical helix waveguide: this method starts from general results about the analysis of a random surface satisfying to some conditions. The first measurements on some samples of waveguide allow to think that this method could lead to an important simplification of the test of some mechanical characteristics of a waveguide line.