Fibre Bragg grating sensors for acoustic sensing

Q. Tao

Research output: ThesisPd Eng Thesis

Abstract

The feasibility of fibre Bragg grating (FBG) based fibre-optic sensing concepts for acoustic
sensing in oil and gas wells has been studied. Based on a fibre-laser (FL) implementation, a prototype interrogator has been realised.
Laboratory tests indicate an interesting noise floor performance: lower than the noise floor of currently used Distributed Acoustic Sensing (DAS) technology and with a potential to achieve a noise floor of 5 pε/√Hz in a 5Hz-5000Hz range. The distortion is less than 2% for strain signals up to 65 nε, a typical maximum strain signal in the considered applications.
An additional advantage of this point-sensing concept is its lower costs compared to DAS for permanent monitoring with a dedicated interrogator, in cases which require less than 120 sensing locations.
This development indicates a potentially interesting acoustic point-sensing concept. A field trial of the prototype interrogator has been planned in Schoonebeek, with the aim to evaluate its performance further.
Original languageEnglish
Awarding Institution
Award date3 Apr 2014
Place of PublicationEindhoven
Publisher
Publication statusPublished - 2014

Bibliographical note

PDEng thesis. - Confidential forever.

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