Optoelectronic distributed measuring device based on brillouin scattering
US10274345B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 2016 |
| Grant date | Apr 30, 2019 |
| Priority date | — |
| Expiry date | Nov 4, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/35358
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method for digitally processing a signal from an optoelectronic distributed measuring device based on Brillouin scattering, said device comprising a continuous light source (1), a coupler (2), an acousto-optic modulator (3), an optical fiber (5) to be tested so that it emits in return a signal by spontaneous Brillouin backscattering at a frequency νF equal to νp−νBz, where νBz is the Brillouin frequency to be measured at every point z of said optical fiber (5), a local oscillator (16) emitting another light signal intended to be mixed with said return signal emitted by Brillouin backscattering by said optical fiber (5) to be tested, a detection module (9) able to detect said Brillouin shift frequency νBz at every point z of said optical fiber and a processing module for linking this Brillouin shift frequency νBz at every point z of said optical fiber to a temperature value and a strain value. According to the invention, the local oscillator (16) comprises a reference optical fiber (18) having a Brillouin frequency identical or close to that of the optical fiber (5) to be tested, said reference optical fiber (18) emitting a signal by spontaneous Brillouin …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.