期刊
OPTICS EXPRESS
卷 20, 期 16, 页码 18117-18126出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.20.018117
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资金
- National Basic Research Program of China [2010CB327802]
- National Natural Science Foundation of China [11004150, 61108070]
- Tianjin Science and Technology Support Key Project [11ZCKFGX01900, 09ZCKFGX01400]
- New Faculty Fund for the Doctoral Program of Higher Education [200800561020]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, SEM, Shenzhen Key Laboratory of Sensor Technology Open Project [SST201013]
A demodulation algorithm based on absolute phase recovery of a selected monochromatic frequency is proposed for optical fiber Fabry-Perot pressure sensing system. The algorithm uses Fourier transform to get the relative phase and intercept of the unwrapped phase-frequency linear fit curve to identify its interference-order, which are then used to recover the absolute phase. A simplified mathematical model of the polarized low-coherence interference fringes was established to illustrate the principle of the proposed algorithm. Phase unwrapping and the selection of monochromatic frequency were discussed in detail. Pressure measurement experiment was carried out to verify the effectiveness of the proposed algorithm. Results showed that the demodulation precision by our algorithm could reach up to 0.15kPa, which has been improved by 13 times comparing with phase slope based algorithm. (C) 2012 Optical Society of America
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