Distributed acoustic sensing system based on space-division multiplexing with multi-core fiber
US10996101B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2019 |
| Grant date | May 4, 2021 |
| Priority date | — |
| Expiry date | Jul 6, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V8/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A distributed acoustic sensing (DAS) system based on space-division multiplexing with multi-core fiber (MCF) is proposed. It relates to a technical field of distributed optical fiber sensing. The present invention maintains the advantage of single-ended measurement in the standard DAS system, and realizes the intensity accumulation of the Rayleigh backscattering light within each core of the MCF, which can greatly improve the strain resolution of DAS systems. Moreover, the introduction of optical switch can make different code sequences transmit in the different core of the MCF simultaneously, which can make the single-pulse response with coding gain demodulated without sacrificing the frequency responding bandwidth. Furthermore, the utilization of space-division multiplexing can make multiple pulses with precious time delay transmit in the MCF simultaneously, which can greatly improve the frequency responding bandwidth of DAS system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.