Magnetic environment stabilization for effective operation of magnetically sensitive instruments
US5225999A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1990 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Oct 11, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F7/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and method for neutralizing magnetic instabilities in an environment of a magnetically sensitive instrument without opposing the operation of the instrument is disclosed. A magnetometer is employed to detect the magnetic instabilities in the environment and provide signals indicative thereof to a feedback circuit. The feedback circuit drives a helmholtz coil that surrounds the instrument to produce a primary magnetic field that compensates for the detected magnetic instabilities. A microprocessor provides an offset value that is used to drive a solenoid located at the magnetometer probe to produce an offsetting field that cancels the effects of secondary magnetic fields produced by the instrument.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.