Simultaneous measurement of strain and temperature using Bragg gratings written in germanosilicate and boron-codoped germanosilicate fibers

Author

Cavaleiro, P.M. ; Araujo, F.M. ; Ferreira, L.A. ; Santos, J.L. ; Farahi, F.

Author_Institution

Unidade de Optoelectron. e Sistemas Electron., INESC, Porto, Portugal

Volume

11

Issue

12

fYear

1999

Firstpage

1635

Lastpage

1637

Abstract

A new fiber Bragg grating sensor configuration is presented for simultaneous measurement of strain and temperature. The sensor utilizes the effect of boron codoping on the temperature dependence of the refractive index in germanosilicate fibers. By writing gratings with dose wavelengths in undoped acid boron doped fibers, different temperature sensitivities are obtained while strain sensitivities remain the same. These gratings are then spliced to obtain a simple sensor head suitable for applications in smart structures and composite materials.

Keywords

Bragg gratings; boron; composite materials; fibre optic sensors; germanate glasses; intelligent sensors; intelligent structures; optical glass; strain measurement; temperature measurement; thermo-optical effects; Bragg gratings; GeO/sub 2/-SiO/sub 2/; GeO/sub 2/-SiO/sub 2/-B/sub 2/O/sub 3/; GeO/sub 2/-SiO/sub 2/:B; boron-codoped germanosilicate fibers; composite materials; dose wavelengths; fiber Bragg grating sensor configuration; germanosilicate fibers; refractive index; simple sensor head; simultaneous measurement; smart structures; strain measurement; strain sensitivities; temperature dependence; temperature measurement; temperature sensitivities; undoped acid boron doped fibers; Boron; Capacitive sensors; Fiber gratings; Optical fiber sensors; Refractive index; Strain measurement; Temperature dependence; Temperature sensors; Wavelength measurement; Writing;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.806871

Filename

806871