Grating enhanced distributed vibration demodulation system and method based on three-pulse shearing interference
US12055433B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2022 |
| Grant date | Aug 6, 2024 |
| Priority date | — |
| Expiry date | Jan 28, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/06758
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention discloses a grating enhanced distributed vibration demodulation system based on three-pulse shearing interference, comprising: a laser device, a pulse optical modulator, a three-pulse generation polarization-maintaining structure, a first erbium-doped fiber amplifier, a first optical circulator, a fiber grating array, a second erbium-doped fiber amplifier, a second optical circulator, a three-in-three optical coupler, a first Faraday rotator mirror, a second Faraday rotator mirror, and a four-channel data acquisition card, On the basis of a distributed fiber grating vibration sensing system, three-pulse dislocation interference and three-in-three optical coupler digital phase demodulation technologies are adopted, XX and XY pulses are utilized to complement interference visibility, and demodulation is performed by selecting a better path, so that polarization fading resistance and interference signal high visibility in the distributed fiber grating vibration sensing system are realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.