Assessment of surface roughness of objects

Details Assessment of surface roughness of objects Assessment of surface roughness of objects

G - Physics

01

B

G01B 13/22 (2006.01)

Patent

CA 2644591

A method of assessing the surface roughness of an object includes directing gas supplied at a constant pressure through a control orifice and subsequently to a measurement nozzle adjacent to and spaced from a surface of the object, with subsequent escape of the gas to the atmosphere. The object is moved past the measurement nozzle and the resultant back pressure of the gas upstream of the measurement nozzle and downstream of the control nozzle is measured to provide a back pressure signal. The frequency content of the back pressure signal is examined to thereby obtain an assessment of the surface roughness of the object.

L'invention concerne une méthode d'évaluation de la rugosité de surface d'un objet qui consiste à diriger un gaz délivré à pression constante par un orifice de contrôle, puis vers une tuyère de mesure adjacente à et espacée d'une surface de l'objet, le gaz s'échappant ensuite dans l'atmosphère. L'objet est déplacé devant la tuyère de mesure et la contre-pression du gaz résultante en amont de la tuyère de mesure et en aval de la tuyère de contrôle est mesurée pour obtenir un signal de contre-pression. Le spectre de fréquence du signal de contre-pression est analysé pour obtenir une évaluation de la rugosité de surface de l'objet.

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