Simultaneous measurement of strain and temperature using the first and second-order diffraction wavelengths of Bragg gratings

Author

Brady, G.P. ; Kalli, K. ; Webb, D.J. ; Jackson, D.A. ; Reekie, L. ; Archambault, J.-L.

Author_Institution

Phys. Lab., Kent Univ., Canterbury, UK

Volume

144

Issue

3

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

156

Lastpage

161

Abstract

A method of discriminating between temperature and strain effects in using a conventionally written, in-fibre grating is presented. The technique uses wavelength information from the first and second diffraction orders of the grating element to determine the wavelength dependent strain and temperature coefficients, from which independent temperature and strain measurements can be made. The authors present results that validate this matrix inversion technique and quantify the strain and temperature errors which can arise for a given uncertainty in the measurement of the reflected wavelength

Keywords

diffraction gratings; fibre optic sensors; measurement errors; strain measurement; strain sensors; temperature measurement; Bragg gratings; first diffraction orders; first-order diffraction wavelengths; grating element; in-fibre grating; matrix inversion technique; measurement uncertainty; reflected wavelength measurement; second diffraction orders; second-order diffraction wavelengths; strain errors; strain measurement; temperature coefficients; temperature errors; temperature measurement; wavelength dependent strain; wavelength information;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings -

Publisher

iet

ISSN

1350-2433

Type

jour

DOI

10.1049/ip-opt:19971373

Filename

600912