Open AccessAnalytical coherency matrix treatment of shear strained fiber Bragg gratings
Author(s) -
Mathias S. Müller,
Christoph D A Schnarr
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.022624
Subject(s) - fiber bragg grating , optics , phosfos , shear (geology) , materials science , polarization (electrochemistry) , infinitesimal strain theory , long period fiber grating , fiber optic sensor , polarization maintaining optical fiber , optical fiber , physics , finite element method , composite material , chemistry , thermodynamics
Reconstruction of the strain tensor at the position of an embedded fiber Bragg grating sensor has been the goal of recent research. However, ambiguities in the measurand--the polarization resolved reflected intensity spectrum--upon occurrence of shear strain hinder its achievement due to lack of an invertible model. In this work, we derive such a model using coherency matrix properties of unpolarized light. We deduce simplified sensor parameters for the ambiguous shear strain loading case, which possibly lead to a practical inversion of the problem.