Magneto-optic transducer
US4417324A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1981 |
| Grant date | Nov 22, 1983 |
| Priority date | — |
| Expiry date | May 5, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/09
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic to optic transducer based upon magnetic bubble technology is provided. A magnetic sheet with a thin magnetic film guide pattern creating a bubble path thereon responds to external magnetic fields to position magnetic bubbles along the path. A varying magnetic field in the plane of the sheet displaces bubbles which are optically sensed by a fiber light conductor contacting both sides of the magnetic sheet at a location in the bubble path. A polarized light source transmits light through the fiber and a polarizing filter on one side of the magnetic sheet to a light detector on the other side of the sheet. The presence or absence of the magnetic bubble at the fiber position thereby affects the polarization of the light transmitted through the sheet and provides a detectable signal for reading the nature of the external magnetic field. The transducer may comprise permanent magnetic field generating means which do not require continuous energization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.