Pneumatic roughness measurer
US4019379A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1976 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Apr 12, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B13/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.