Fiber optic distributed temperature sensor system
US5113277A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 22, 1990 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Jun 22, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/29362
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fiber optic distributed temperature sensor system outputs a temperature distribution along the longitudinal direction of a sensor optical fiber by measuring the temperature dependency of Raman scattered light intensity produced in an optical fiber by use of the OTDR technique. The system is characterized in that a light output from a light source is input to the sensor (optical fiber) via an optical wavelength division demultiplexer, that among the reflected light of back scattered light returning from the sensor optical fiber, light of a particular wavelength range is reflected or transmitted by at least one optical filter of the optical wavelength division demultiplexer to separate the light of the particular wavelength range and that signal of the light of the particular wavelength range is guided to a detector of an optical measuring system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.