Centre Technique Des Industries Mecaniques

Michel Leveque

Claude Wartelle

A method for measuring the surface roughness of a workpiece, comprising filling two capacitors with a compressed gas at specific pressures; applying to the rough surface of the workpiece to be studied the open end of a bell-form sensor connected to a second one of the capacitors; evacuating simultaneously and individually to atmosphere the two capacitors, the first through a calibrated throttle, the second through the leak existing between the edge of said sensor bell and the rough surface of the workpiece; measuring, during evacuation, the difference between the pressures in the two capacitors; and deducing from this pressure differential, by standardization with sample pieces of known roughness, the roughness of the piece studied.

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Champigny sur Marne, France

Michel Leveque