Conference paper

Discrimination of temperature and strain by combined refractive index and birefringence measurements using coherent Rayleigh sensing

Temperature and strain discrimination is experimentally demonstrated in an elliptical-core polarization-maintaining fiber by making use of Rayleigh-based distributed birefringence measurements and the frequency shift of the correlation peak obtained by standard coherent optical time-domain reflectometry. The high sensitivity of coherent Rayleigh sensing and the very distinct behavior of birefringence makes the two quantities clearly discriminated, resulting in temperature and strain accuracies of   40 mK and   0.5 με, respectively, for distributed measurements with a 2 m spatial resolution.

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