Real-time quasi-coherent detection and fiber sensing using multi-frequency signals
US12235141B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2022 |
| Grant date | Feb 25, 2025 |
| Priority date | — |
| Expiry date | Aug 18, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/226
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Distributed acoustic sensing (DAS) system for quasi-coherent detection of at least one multi-frequency signal over an optical fiber, including a multi-frequency pulse generator, a circulator, a coherent detector and a processor, the pulse generator for generating at least one multi-frequency pulse train including at least two pulses each having a different frequency, the pulse train including a plurality of carriers, the coherent detector for receiving at least one backscattered signal from the optical fiber and the processor for quasi-coherent aggregation of the carriers in the backscattered signal, wherein the processor channelizes the backscattered signal into at least one complex signal for each frequency in the carriers and wherein for each complex signal, the processor respectively extracts at least one of an amplitude change and a phase change for each one of the carriers and selectively aggregates at least one of the changes for the carriers for determining if an event has occurred over the optical fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.