Patent ID: 8869631
Filing Date: 2014-10-28
Classification: G01B

Abstract:
1. A method of detecting thickness of walls of elongate hollow bodies of carbon fiber composite material, the method comprising the steps of: a1) providing a hollow manufactured body having at least one wall of non-ferromagnetic material with an outer surface and an inner surface facing a cavity of the body; a2) providing an inner slider and an outer slider, comprising: b1) locating the inner slider on the inner surface of the wall, so that the corresponding element of the first couple of elements is free to contact the inner surface, and b2) placing the outer slider on the outer surface so that the corresponding element of the first couple of elements is free to contact the outer surface due to the magnetic attractive force mutually exchanged with the other element of the first couple; c) manually moving the outer slider across the outer surface to a predetermined point where the wall thickness is to be detected, wherein the inner slider on the inner surface follows the movements of the outer slider due to the magnetic attractive force mutually exchanged between the elements of the second couple; d) measuring, by a transducer device mounted on the outer slider and mechanically connected to the corresponding element of the first couple, the force required to detach the corresponding element of the first couple from the outer surface; and e) deriving, from the measured force, the value of the thickness of the wall in that predetermined point.