Large-Dynamic-Range and High-Stability Phase Demodulation Technology for Fiber-Optic Michelson Interferometric Sensors

Zhang, Wanjin, Lu, Ping, Qu, Zhiyuan, Zhang, Jiangshan, Wu, Qiang and Liu, Deming (2022) Large-Dynamic-Range and High-Stability Phase Demodulation Technology for Fiber-Optic Michelson Interferometric Sensors. Sensors, 22 (7). p. 2488. ISSN 1424-8220

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A large-dynamic-range and high-stability phase demodulation technology for fiber-optic Michelson interferometric sensors is proposed. This technology utilizes two output signals from a 2 × 2 fiber-optic coupler, the interferometric phase difference of which is π. A linear-fitting trigonometric-identity-transformation differential cross-multiplication (LF-TIT-DCM) algorithm is used to interrogate the phase signal from the two output signals from the coupler. The interferometric phase differences from the two output signals from the 2 × 2 fiber-optic couplers with different coupling ratios are all equal to π, which ensures that the LF-TIT-DCM algorithm can be applied perfectly. A fiber-optic Michelson interferometric acoustic sensor is fabricated, and an acoustic signal testing system is built to prove the proposed phase demodulation technology. Experimental results show that excellent linearity is observed from 0.033 rad to 3.2 rad. Moreover, the influence of laser wavelength and optical power is researched, and variation below 0.47 dB is observed at different sound pressure levels (SPLs). Long-term stability over thirty minutes is tested, and fluctuation is less than 0.36 dB. The proposed phase demodulation technology obtains large dynamic range and high stability at rather low cost.

Item Type: Article
Additional Information: Funding information: This work was supported by NSFC (No. 61775070), NSFC-RS Exchange Programme (No.62111530153), the Royal Society International Exchanges 2020 Cost Share (NSFC) of UK (No. IEC\NSFC\201015) and funding from the Science, Technology and Innovation Commission of Shenzhen Municipality (2021Szvup089).
Uncontrolled Keywords: phase demodulation, fiber-optic Michelson interferometric sensor, 2 × 2 coupler, coupling ratio, acoustic sensor
Subjects: H600 Electronic and Electrical Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 05 Apr 2022 14:13
Last Modified: 05 Apr 2022 14:15

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