Patent ID: 7484309

Claim:
A system for measuring an internal dimension, of a cylindrical cavity over a determined length in a turbomachine hollow shaft, said system comprising: a measurement module mounted removably on a mobile support that has translational mobility inside and along a longitudinal axis of the cavity, the measurement module comprising a measurement component for measuring the internal dimension and delivering signals corresponding to measured values and incorporating a recording and storage device for recording and storing said measured values, wherein said measurement module includes at least a tubular proximal part having a first outer diameter and a tubular distal part having a second outer diameter, said first outer diameter being larger than said second outer diameter, wherein said proximal and distal parts are separated by a tubular intermediate part having an envelope of varying outer diameter, wherein said measurement component includes a movable mechanical sensor that is movable between a retracted position and an extended position, wherein, in said retracted position, said mechanical sensor is inside said envelope of said intermediate part, and wherein, in said extended position, said mechanical sensor extends outside said envelope of said intermediate part.