Publication No: 4636Search all ORC publications    

A temperature insensitive Bragg grating sensor using orthogonal polarisation modes for in-situ temperature compensation

Richard M.Parkera,b, James C.Gatesa, Martin C.Grosselb and Peter G.R.Smitha

a. Optoelectronics Research Centre, University of Southampton, UK
b. School of Chemistry, University of Southampton, UK

Abstract

An exposed Bragg grating incorporated into a planar waveguide forms an optical device that acts as a refractive index sensor. The exposed evanescent field causes the Bragg peak to be sensitive to the refractive index of its surroundings and can be used to detect changes in this environment. The method reported is able to provide accurate temperature compensation by applying a scaling factor derived from measurement of the birefringence of the transverse electric (TE) and transverse magnetic (TM) modes of the Bragg reflection. For a fluid sensor, fluctuations in ambient temperature can be both accounted for and compensated to produce a temperature-insensitive sensor.


Sensors & Actuators: B Chemical (2010) Vol.145(1) pp.428-432

doi: 10.1016/j.snb.2009.12.059

Southampton ePrint id: 148221

 

 

 

Copyright University of Southampton 2006