A novel multi-functional fibre optic sensor

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

Colleges, School and Institutes

Abstract

Whilst considerable progress continues to be made on the design and deployment of fibre optic sensors for chemical process monitoring and structural integrity assessment, the majority of these sensor designs can only impart information on one or two relevant measurands. For example, in the case of chemical process monitoring of advanced fibrereinforced composites involving thermosetting resins, it is generally appreciated that cross-linking kinetics can be influenced by a number of factors including the following: the stoichiometry of the reagents, temperature, surface chemistry of the substrate and presence or absence of contaminants. Thermosetting resins also shrink during the crosslinking process. When thermosets are used and processed above room temperature during the production of fibrereinforced composites, upon cooling back to ambient temperature, residual stress can develop due to the mismatch in thermal expansions between the reinforcing fibres and the matrix. This paper reports on recent progress on the design and demonstration of a novel multi-functional fibre optic sensor that can provide data on (i) temperature, (ii) strain, (iii) refractive index, (iv) transmission infrared spectroscopy and (v) evanescent wave spectroscopy. A unique and attractive feature of this sensor is that a conventional commercially available Fourier transform infrared spectrometer is used to interrogate the sensor. The sensor design is based on an extrinsic fibre Fabry-Perot interferometer.

Details

Original languageEnglish
Title of host publicationSmart Sensor Phenomena, Technology, Networks, and Systems 2009
Publication statusPublished - 15 Jun 2009
EventSmart Sensor Phenomena, Technology, Networks, and Systems 2009 - San Diego, CA, United States
Duration: 9 Mar 200911 Mar 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7293
ISSN (Print)0277-786X

Conference

ConferenceSmart Sensor Phenomena, Technology, Networks, and Systems 2009
CountryUnited States
CitySan Diego, CA
Period9/03/0911/03/09

Keywords

  • Composite, Cure, Fabry-Perot, Fibre Bragg grating (FBG), Multi-functional, Refractive index, Residual strain