Methods and apparatus for measuring the postion of an edge of a metal strip by electronic induction
US5339029A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1992 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Aug 14, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2557/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method for inductively measuring the position of a strip of metal, in which a primary coil fed by an alternating voltage is arranged on one side of a strip edge and a secondary coil is arranged on the other side of the strip edge and a signal reproducing the strip position is derived from the change in coupling at the secondary coil caused by the shielding by the strip, the primary coil is operated at a high frequency of the alternating voltage of at least 10 kHz in order to widen the field of application of the inductive strip position measuring. Non-magnetic coil cores are provided at primary and secondary coil in order to achieve a high natural resonant frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.