Spherical shell fibre optic magnetic field sensors and magnetometers and magnetic gradient detectors incorporating them
US4697146A · kind A · utility
9Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1986 |
| Grant date | Sep 29, 1987 |
| Priority date | — |
| Expiry date | Feb 10, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/0327
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic field sensor is comprised by a length of magnetically sensitized single mode optical fibre wound in substantially random directions on a sphere of non-magnetic material, so that an omnidirectional response is obtained. Specific directionality can be obtained by application of a dc bias field in the desired direction. All three perpendicular components can be measured by applying three perpendicular ac fields at different frequencies. The sensor is intended for use in all fibre Mach-Zehnder interferometer types of magnetometer or magnetic gradient detector, examples of which are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.