Magnetic field sensors, in particular optical fiber magnetometers
US4712065A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1986 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Feb 20, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/0327
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a fiber optic interferometric magnetic sensor or magnetic gradient detector a magnetic bias field is applied to a magnetically sensitized portion of an optical fiber by means which are driven by optical power whereby a completely passive sensor head arrangement may be achieved. In a magnetic gradient detector optical power from a high power laser (34) may be supplied via an optical fiber (35) to illuminate a solar cell 27 to whose electrical output terminals solenoids (25,26) are connected. A portion of a respective optical fiber (21, 22) which is magnetically sensitized, by for example bonding to a strip of magnetostrictive material (23, 24), is disposed inside each solenoid (25, 26).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.