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Demodulation method combining virtual reference interferometry and minimum mean square error for fiber-optic Fabry–Perot sensors 被引量:1
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作者 桂新旺 Michael Anthony Galle +4 位作者 钱黎 梁伟龙 周次明 欧艺文 范典 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第1期30-33,共4页
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 conv... 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. 展开更多
关键词 VRI Demodulation method combining virtual reference interferometry and minimum mean square error for fiber-optic Fabry Perot sensors
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