Adaptive dynamic FBG interrogation utilising erbium-doped fibre

Ryan N John, Ian Read, William Neil MacPherson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A dynamic fibre Bragg grating interrogation scheme is investigated using two-wave mixing in erbium-doped fibre, capable of adapting to quasistatic strain and temperature drifts. An interference pattern set up in the erbium-doped fibre creates, due to the photorefractive effect, a dynamic grating capable of wavelength demodulating the FBG signal. The presence of a dynamic grating was verified and then dynamic strain signals from a fibre stretcher were measured. The adaptive nature of the technique was successfully demonstrated by heating the FBG while it underwent dynamic straining leading to detection unlike an alternative arrayed waveguide grating system which simultaneously failed detection. Two gratings were then wavelength division multiplexed with the signal grating receiving approximately 30dB greater signal showing that there was little cross talk in the system.

Original languageEnglish
Title of host publicationSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013
EditorsJerome P Lynch, Chung-Bang Yun, Kon-Well Wang
PublisherSPIE
Number of pages8
Volume8692
DOIs
Publication statusPublished - 2013
EventConference on Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems - San Diego, United States
Duration: 10 Mar 201314 Mar 2013

Publication series

NameProceedings of SPIE
Volume8692
ISSN (Print)0277-786X
ISSN (Electronic)0277-786X

Conference

ConferenceConference on Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
CountryUnited States
CitySan Diego
Period10/03/1314/03/13

Keywords

  • fibre Bragg grating
  • structural health monitoring
  • two wave mixing
  • erbium-doped fibre
  • dynamic strain
  • SENSORS

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