On line electromagnetic web thickness measuring apparatus incorporating a servomechanism with optical distance measuring
US5327082A · kind A · utility
6Cited by
16References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1992 |
| Grant date | Jul 5, 1994 |
| Priority date | — |
| Expiry date | Jan 13, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B2210/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for measuring the thickness of a moving web of material in which a ferromagnetic core carrying a winding and a ferromagnetic disc are disposed on opposite sides of the web at constant distances therefrom with at least one of said distances being maintained by a servomechanism including an optical distance measuring device whereby the inductance of said coil is a measure of the thickness of the web.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.