Temperature- and strain-independent torsion sensor utilising polarisation-dependent loss of Hi-Bi FBGs

Author

Wang, Yu Peng ; Huang, X.Q. ; Wang, Michael

Author_Institution

Jiangsu Key Lab. on Opto-Electron. Technol., Nanjing Normal Univ., Nanjing, China

Volume

49

Issue

13

fYear

2013

fDate

June 20 2013

Firstpage

840

Lastpage

841

Abstract

A temperature- and strain-independent torsion sensor based on analysis of polarisation-dependent loss (PDL) characteristics of high-birefringent (Hi-Bi) fibre Bragg gratings (FBGs), is proposed and demonstrated. Unlike the amplitude spectra, the PDL response has higher sensitivity to torsion. Experimetal results demonstrate that the difference between the two peaks in the PDL spectra has a linear relationship with the twist rate, but remains invariant with changes in temperature and strain. In addition, it was observed that the PDL responses to the clockwise twist are just opposite of the responses to the couterclockwise twist.

Keywords

Bragg gratings; birefringence; fibre optic sensors; optical fibre losses; optical fibre polarisation; torsion; Hi-Bi FBG; PDL spectra; amplitude spectra; clockwise twist rate; couterclock-wise twist; high-birefringent fibre Bragg gratings; linear relationship; polarisation-dependent loss; strain-independent torsion sensor; temperature-independent torsion sensor; torsion sensitivity;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2013.1229

Filename

6553050