Compensated transducer
US4596950A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1981 |
| Grant date | Jun 24, 1986 |
| Priority date | — |
| Expiry date | Dec 18, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/205
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A compensated measurement transducer for measuring a first current generates a first magnetic field of a predetermined direction which flows in a first circuit including a first conductor; a second current substantially similar to the first current is generated in a second circuit and the first current is measured by obtaining the value of the second current. The second circuit includes a compensating current conductor, which generates a second magnetic field, compensating the first magnetic field, a Wheatstone bridge to which both magnetic fields are applied, and an amplifier connected to the output of the Wheatstone bridge, and coupled to the compensating current conductor. An auxiliary magnetic field is applied to the Wheatstone bridge, which is connected to a current- or voltage-source, and includes four ferromagnetic and magnetoresistive thin film. The magnetic fields have a direction along the direction of the hard magnetic axes of the thin films, and the thin films are so positioned that the magnetization of two electrically oppositely disposed thin films, which results from the application of the first and second magnetic fields thereof, is rotated in a direction opposite t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.