Distributed fibre sensing system and vibration detection and positioning method therefor
US10989587B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 26, 2016 |
| Grant date | Apr 27, 2021 |
| Priority date | — |
| Expiry date | Jan 15, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/35358
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A distributed fibre sensing system and a vibration detection and positioning method therefor are disclosed. The system comprises: a signal generating module, a light source module, an optical frequency comb generating module, a frequency sweeping and pulse generating module, an optical circulator, a sensing fibre, an interference module, a photoelectric conversion module and a detection and position module. The method comprises: obtaining a plurality of Rayleigh backscattering signals of the sensing fibre; performing a fading elimination processing on the Rayleigh backscattering signals, thereby obtaining a plurality of averaged Rayleigh backscattering signals of non-interference fading and polarization fading; performing a phase processing on the averaged Rayleigh backscattering signals, thereby obtaining phase variance curves; and determining a vibration point according to variances in the phase variance curves, and finally obtaining a position and a vibration waveform of the vibration point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.