Method for measuring the thickness and temperature of a moving metal sheet by means of eddy currents
US4757259A · kind A · utility
61Cited by
8References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1986 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Nov 5, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A non-contacting, eddy current, measuring method for determining the thickness and temperature of a moving metal sheet as in a metal rolling operation. Two separate magnetic fields are generated by applying two voltages of differing frequencies to a primary winding on one side of the sheet to induce two voltages in an opposed secondary winding on the other side of the sheet. The generated voltages are used to determine the calibration constants required to calculate the thickness and temperature of the moving sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.