COMPENSATION FOR SURFACE CONTAMINATION WITH D-FIBER SENSOR

A novel polarimetric referencing scheme is proposed in order to correc t measurements in a D-fibre methane gas sensor. The technique makes us e of the polarization-maintaining property of the D-fibre. Theoretical analysis of the scheme is carried out using a semivectorial polarized finite-difference method. Results show that the referencing technique can be applied to a wide range of both aqueous and gaseous species as it does not depend on the absorption coefficient of the absorber, but only on the birefringence properties of the waveguide.