Web thickness sensor using loop-gap resonator
US4623835A · kind A · utility
29Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1984 |
| Grant date | Nov 18, 1986 |
| Priority date | — |
| Expiry date | Mar 14, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/223
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The thickness of a web is measured by passing the web through the gaps of a loop-gap resonator. Changes in web thickness alter the resonant frequency of the resonator which is detected by a control circuit. Three embodiments of the invention are described, and in one embodiment, the moisture content of the web is also measured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.