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Optical Fibre Refractive Index Sensor in a Hybrid Fibre Grating Configuration

Alwis, Lourdes; Sun, Tong; T.V. Grattan, Kenneth


Tong Sun

Kenneth T.V. Grattan


Gerald Urban


Jochen Kieninger


A temperature compensated Refractive Index (RI) sensor incorporating a Long Period Grating (LPG) and a Fibre Bragg Grating (FBG) in a series configuration has been developed and evaluated. The LPG was used as a RI sensor allowing it to respond to external RI variations while the FBG was used for temperature compensation. The LPG and FBG wavelengths were chosen to be within suitable spectral bandwidths for efficient interpretation of both RI and temperature. The performance of the hybrid sensor was evaluated for use as a chemical sensor by varying sodium chloride (NaCl) concentrations in water from 0.25 – 2%NaCl and temperature from 10-95 oC and by recording its corresponding attenuation band shifts. The sensitivity of the hybrid sensor to NaCl concentration and temperature is calculated to be 0.61 nm/%NaCl and 8 pm/oC respectively.


Alwis, L., Sun, T., & T.V. Grattan, K. (2015). Optical Fibre Refractive Index Sensor in a Hybrid Fibre Grating Configuration. Procedia Engineering, 120, 11-14.

Journal Article Type Conference Paper
Conference Name EuroSensors
Start Date Sep 6, 2015
End Date Sep 9, 2015
Acceptance Date Jun 1, 2015
Online Publication Date Sep 11, 2015
Publication Date Sep 11, 2015
Deposit Date Dec 11, 2017
Publicly Available Date Dec 11, 2017
Journal Procedia Engineering
Print ISSN 1877-7058
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 120
Pages 11-14
Keywords Fibre Bragg grating (FBG), Long period grating (LPG), Refractive index (RI),
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