Pump-power-independent double slope-assisted distributed and fast brillouin fiber-optic sensor
US9885619B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 1, 2015 |
| Grant date | Feb 6, 2018 |
| Priority date | — |
| Expiry date | Mar 6, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K11/322
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of stimulated Brillouin scattering is proposed in which both slopes of the BGS spectrum are probed to achieve immunity to pump power variations. Suitably applied, the technique can maintain all the benefits of the known Slope-Assisted-BOTDA technique, while using the same setup but at the cost of halving the sampling speed. the method may include: obtaining a reference Brillouin gain spectrum (BGS) representative of steady state or average conditions in various locations of the optical fiber along its length; generating, based on the reference BGS, a probe wave being a complex waveform comprising a first and second set of waveforms, each set having waveforms tailored to match an opposite slope of the reference BGS, at the various locations; performing stimulated Brillouin scattering at the various locations by applying a pump pulse wave to the probe wave; and deducing the local Brillouin frequency shift (BFS) at the various locations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.