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28 September 2015 Fourier transform-based absolute phase interrogation algorithm for Sagnac interferometer-based PMF sensors
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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.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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