Optical monitor for measuring a gap between two rollers
US5392123A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1994 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Feb 22, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gap measurement device includes a first roller and a second roller. The first roller and the second roller define a gap which varies due to thermal expansion and contraction of the rollers. A first optical probe measures a first distance to the first roller and generates a first-distance signal indicative of the first distance. A second optical probe measures a second distance to the second roller and generates a second-distance signal indicative of the second distance. An electronics module generates a gap-width signal indicative of the gap based on the first-distance signal and the second-distance signal. The invention can also measure roller velocity, roller runout, roller registration, and the thickness of liquid on a roller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.