Compensating feedback system for multi-sensor magnetometers
US4380735A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1980 |
| Grant date | Apr 19, 1983 |
| Priority date | — |
| Expiry date | Dec 1, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/025
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetometer having two or more sensor feedback systems provides improved accuracy by compensating for the effect of the feedback field in each system on the other systems. Each system has a sensor for sensing a magnetic field, a feedback coil associated with the sensor for providing a feedback field at the latter, a feedback circuit for energizing the feedback coil in response to sensing of the magnetic field by the sensor and thereby producing at the sensor a feedback field for cancelling the sensed field at the sensor, a differential amplifier for deriving from the feedback circuit a first electrical signal proportional to the feedback field, resistors of predetermined resistances selected for modifying the first electrical signal to electrical signals which are each proportional to the feedback field at the sensor of a respective other one of the sensor feedback systems, and circuitry for combining the first electrical signal from each of the systems with one of the modified signals of each of the other of the systems to provide, from each of the systems, a respective output signal corresponding to the magnetic field sensed by that system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.