Open AccessHighly sensitive force sensor based on optical microfiber asymmetrical Fabry-Perot interferometer
Author(s) -
Yuan Gong,
Caibin Yu,
Tingting Wang,
Xiuping Liu,
Yu Wu,
Yunjiang Rao,
Minglei Zhang,
Huijuan Wu,
Xiaoxiao Chen,
Gang-Ding Peng
Publication year - 2014
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.003578
Subject(s) - optics , materials science , microfiber , fabry–pérot interferometer , fiber bragg grating , fiber optic sensor , tapering , interferometry , fresnel equations , optical fiber , optoelectronics , wavelength , refractive index , physics , computer graphics (images) , computer science , composite material
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 0.221 pm/μN with a tapered microfiber of 40 mm length and 6.1 μm waist diameter. Compared with similar AFPI structure in 125 μm-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.