26 October 2017 Fourier phase demodulation of interferometric fiber sensor
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Proceedings Volume 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications; 104642D (2017) https://doi.org/10.1117/12.2285458
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China
Abstract
A novel demodulation method for interferometric fiber sensor is proposed in this paper. The physical parameters to be measured by the sensor is obtained by calculating the phase variation of the interference components. The phase variation is computed with the assist of the fast Fourier analysis. For fiber interferometers, most of the energy is contained in the few spatial frequencies corresponding to the components that produce the interference. Therefore, the information of the interference fringe can be presented by the Fourier results at those intrinsic frequencies. Based on this assumption, we proposed a novel method to interrogate the fiber interferometer by calculating the Fourier phase at the spatial frequency. Theoretical derivation proves that the Fourier phase variation is equal to the phase change of the interferometer. Simulation results demonstrate the ability of noise resistance of the proposed method since the information of all wavelength sampling points are adopted for the demodulation process. A Sagnac interferometer based on a section of polarization-maintaining photonic crystal fiber is utilized to verify the feasibility of the phase demodulation technique by lateral pressure sensing. Experimental results of -0.069rad/kPa is acquired.
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Xin Fu, Ping Lu, Deming Liu, Jiangshan Zhang, "Fourier phase demodulation of interferometric fiber sensor", Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 104642D (26 October 2017); doi: 10.1117/12.2285458; https://doi.org/10.1117/12.2285458
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