Multiple-point temperature sensor using optic fibers
US4928005A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1989 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Jan 24, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/344
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multiple-point temperature sensor, with optic fibers, uses the effect of variation in the birefringence in a birefringent optic fiber as a function of temperature. This sensor has a plane polarized, wide spectrum source coupled to a monomode optic fiber for preservation of polarization, along one of the neutral axes, with weak coupling points distributed along this fiber. A polarizer at 45.degree. to the neutral axes of the fiber is placed at the output of this sensing fiber. The output radiation is analyzed by spectroscopy, for example in a Michelson interferometer, capable of being swept, associated with a detector. The interferometer shifts needed to detect the extreme values of the transmission function are measurements of temperature deviations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.