Optical fiber sensor coil using reverse quadrupoles and method of winding same
US5475774A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1994 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | Jun 30, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/722
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a optical fiber coil arrangement for use in rotation sensors, for example, errors resulting from axial and/or radial time varying temperature gradients can be minimized or substantially eliminated by employing reverse quadrupoles for the sensor coil. One of the quadrupoles is wound in a + - - + winding configuration. However, the next adjacent quadrupole is wound in a - + + - winding configuration. This reverse quadrupole arrangement substantially eliminates radial time varying temperature gradient dependent errors and reduces axial time varying temperature gradient dependent errors. The axial time varying temperature gradient dependent errors can be substantially eliminated by winding a reverse octupole arrangement. Accordingly, a reverse octupole arrangement is wound with a + - - + - + + - - + + - + - - + winding configuration. Alternatively, the axial time varying temperature gradient dependent errors can be substantially eliminated by providing extra lengths of the "+" and "-" ends which are axially displaced so as to substantially eliminate this axial time varying temperature gradient dependent error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.