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

© The Institution of Engineering and Technology
Received 15/04/2013, Published
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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.

Inspec keywords: birefringence; Bragg gratings; torsion; optical fibre polarisation; fibre optic sensors; optical fibre losses

Other keywords: couterclock-wise twist; polarisation-dependent loss; torsion sensitivity; amplitude spectra; strain-independent torsion sensor; clockwise twist rate; high-birefringent fibre Bragg gratings; PDL spectra; temperature-independent torsion sensor; linear relationship; Hi-Bi FBG

Subjects: Optical propagation, dispersion and attenuation in fibres; Other fibre optical properties; Fibre optics; Fibre optic sensors; fibre gyros; Fibre optic sensors; Other optical system components; Gratings, echelles; Other fibre optical devices and techniques

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