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Title: Fourier transform-based absolute phase interrogation algorithm for Sagnac Interferometer-based PMF Sensors
Authors: Chen, Y
Yang, Y
Liu, S
Yang, M
Jin, W 
Keywords: Absolute phase interrogation
Fourier transform
Optical fiber sensor
Sagnac interferometers
Issue Date: 2015
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, v. 9634, 96343A How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
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 0.1oC temperature resolution and up to 900 oC temperature can be measured with good linearity.
ISBN: 9781628418392
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.2194642
Appears in Collections:Conference Paper

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