Chinese Optics Letters, 2018, 16 (1): 010606, Published Online: Jul. 17, 2018  

Demodulation method combining virtual reference interferometry and minimum mean square error for fiber-optic Fabry–Perot sensors Download: 808次

Author Affiliations
1 National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China
2 Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology, Wuhan 430070, China
3 Department of Electrical and Computer Engineering, University of Toronto, Toronto M5S-3G4, Canada
Abstract
We propose a cavity length demodulation method that combines virtual reference interferometry (VRI) and minimum mean square error (MMSE) algorithm for fiber-optic Fabry–Perot (F-P) sensors. In contrast to the conventional demodulating method that uses fast Fourier transform (FFT) for cavity length estimation, our method employs the VRI technique to obtain a raw cavity length, which is further refined by the MMSE algorithm. As an experimental demonstration, a fiber-optic F-P sensor based on a sapphire wafer is fabricated for temperature sensing. The VRI-MMSE method is employed to interrogate cavity lengths of the sensor under different temperatures ranging from 28°C to 1000°C. It eliminates the “mode jumping” problem in the FFT-MMSE method and obtains a precision of 4.8 nm, corresponding to a temperature resolution of 2.0°C over a range of 1000°C. The experimental results reveal that the proposed method provides a promising, high precision alternative for demodulating fiber-optic F-P sensors.

Xinwang Gui, Michael Anthony Galle, Li Qian, Weilong Liang, Ciming Zhou, Yiwen Ou, Dian Fan. Demodulation method combining virtual reference interferometry and minimum mean square error for fiber-optic Fabry–Perot sensors[J]. Chinese Optics Letters, 2018, 16(1): 010606.

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