期刊
OPTICS EXPRESS
卷 22, 期 3, 页码 3578-3584出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.003578
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资金
- National Natural Science Foundation of China [61107073, 61107072, 61290312]
- Fundamental Research Funds for the Central Universities [ZYGX2011J002]
- Research Fund for the Doctoral Program of Higher Education of China [20110185120020]
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT) [IRT1218]
- 111 Project [B14039]
An asymmetrical Fabry-Perot interferometric (AFPI) force sensor is fabricated based on a narrowband reflection of low-reflectivity fiber Bragg grating (LR-FBG) and a broadband Fresnel reflection of the cleaved fiber end. The AFPI sensor includes a section of microfiber made by tapering and it achieves a force sensitivity of 0.221pm/mu N with a tapered microfiber of 40mm length and 6.1 mu m waist diameter. Compared with similar AFPI structure in 125 mu m-diameter single mode fiber, the force sensitivity of the microfiber AFPI structure is greatly enhanced due to its smaller diameter and can be optimized for different force scales by controlling the diameter. The fabrication process of the AFPI sensor is simple and cost-effective. The AFPI sensor has better multiplexing capacity than conventional extrinsic fiber-optic Fabry-Perot sensors, while it also release the requirement on the wavelength matching of the FBG-pair-based FPI. (C) 2014 Optical Society of America
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