High-performance distributed fiber sensing system based on EHz ultrafast pulse scanning
US11231299B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2019 |
| Grant date | Jan 25, 2022 |
| Priority date | — |
| Expiry date | Apr 25, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/35387
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A high-performance distributed fiber sensing system based on EHz ultrafast pulse scanning. During testing of a disturbance signal, an internally frequency converted pulse light emitted by an EHz ultrafast pulse scanning laser enters a sensing fiber after passing through a circulator, and a backward Rayleigh scattering signal transmitted by the sensing fiber enters an unbalanced Michelson interferometer after passing through a coupler. By designing an arm length difference between two interference arms, interferences sequentially occur for the backward Rayleigh scattering light at a position where lengths of two adjacent arms differ. A signal received after passing through the unbalanced Michelson interferometer includes a phase difference signal caused by an external disturbance signal in the sensing fiber. Finally, variations of the phase difference signal over time are demodulated by using a phase demodulation unit, so that a dynamic measurement of the disturbance signal in the sensing fiber may be performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.