Fourier transform-based absolute phase interrogation algorithm for Sagnac interferometer-based PMF sensors

Yuxuan Chen; Yuanhong Yang; Shuo Liu; Mingwei Yang; Wei Jin

doi:10.1117/12.2194642

28 September 2015 Fourier transform-based absolute phase interrogation algorithm for Sagnac interferometer-based PMF sensors

Yuxuan Chen, Yuanhong Yang, Shuo Liu, Mingwei Yang, Wei Jin

Author Affiliations +

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96343A (2015) https://doi.org/10.1117/12.2194642
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

A high resolution and absolute phase interrogation algorithm for Sagnac interferometer based polarization maintaining fiber (PMF) sensor is proposed. Taking wavenumber instead of wavelength as the function variable, the output spectrum will be a standard cosine spectrum function. After Fourier transform, the frequency and relative phase of this spectrum function can be obtained and the precise absolute phase due to optical path difference between the two polarization modes in sensing PMF can be determined. A typical Sagnac interferometer based PMF temperature sensor was built and the absolute phase was determined by use of the proposed algorithm. Experiments show that 0.1°C temperature resolution and up to 900°C temperature can be measured with good linearity.

Citation Download Citation

Yuxuan Chen, Yuanhong Yang, Shuo Liu, Mingwei Yang, and Wei Jin "Fourier transform-based absolute phase interrogation algorithm for Sagnac interferometer-based PMF sensors", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96343A (28 September 2015); https://doi.org/10.1117/12.2194642

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