Grating position dithering for improved distributed acoustic sensing engineered fiber performance
US12168928B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 2021 |
| Grant date | Dec 17, 2024 |
| Priority date | — |
| Expiry date | Feb 7, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/1429
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical system employs a method for measuring an acoustic signal in a wellbore. The optical system includes an optical interrogator and an optical fiber. The optical fiber has a plurality of nominal sites uniformly spaced apart along a longitudinal axis of the optical fiber. A plurality of gratings are formed in the optical fiber. Each of the plurality of gratings is associated with a nominal site and is separated from its associated nominal site by an offset distance. The offset distance is selected to reduce a destructive interference between reflections from the plurality of gratings. The optical interrogator transmits a light pulse into the optical fiber to measure the acoustic signal via a reflection of the light pulse from at least one of the plurality of gratings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.