Fiber sensor
US4773753A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1986 |
| Grant date | Sep 27, 1988 |
| Priority date | — |
| Expiry date | Aug 26, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K11/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fiber sensor for measuring temperature or strain comprises a first polarization-maintaining fiber and a second polarization-maintaining fiber. In case of a temperature fiber sensor, the first and second fibers are selected to be unequal in change in phase difference caused by change in temperature but equal in change in phase difference caused by strain. In case of a strain fiber sensor, the first and second fibers are selected to be unequal in change in phase difference caused by strain but equal in change in phase difference caused by change in temperature. Axes of polarization of the first and second fibers are shifted by 90.degree. at a junction of the fibers. With this arrangement, the temperature fiber sensor can measure the change in temperature with high accuracy without being affected by strain, while the strain fiber sensor can measure the strain with high accuracy without being affected by the change in temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.