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

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

Content Provider	MDPI
Author	Zhang, Wanjin Lu, Ping Qu, Zhiyuan Zhang, Jiangshan Wu, Qiang Liu, Deming
Copyright Year	2022
Description	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.
Starting Page	2488
e-ISSN	14248220
DOI	10.3390/s22072488
Journal	Sensors
Issue Number	7
Volume Number	22
Language	English
Publisher	MDPI
Publisher Date	2022-03-24
Access Restriction	Open
Subject Keyword	Sensors Phase Demodulation Fiber-optic Michelson Interferometric Sensor 2 × 2 Coupler Coupling Ratio Acoustic Sensor
Content Type	Text
Resource Type	Article

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