Open AccessStrain force sensor with ultra-high sensitivity based on fiber inline Fabry-Perot micro-cavity plugged by cantilever taper
Author(s) -
Yi Liu,
Changpeng Lang,
Xiaocun Wei,
Shiliang Qu
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.007797
Subject(s) - cantilever , tapering , fabry–pérot interferometer , materials science , optics , optical fiber , fiber optic sensor , fiber , linearity , optoelectronics , composite material , electronic engineering , physics , wavelength , computer graphics (images) , computer science , engineering
A strain force sensor based on fiber inline Fabry-Perot (FP) micro-cavity plugged by cantilever taper was proposed. The structure was fabricated by simple and cost-effective method only including fiber cleaving, tapering and splicing. The active-length of the FP micro-cavity reached 1360 µm, while the interference length was only 3.5 µm. Owing to the ultra-long active-length and ultra-short interference length, the strain force sensitivity of the fiber inline FP micro-cavity plugged by cantilever taper reached as high as 841.59 nm/N. Besides, the proposed structure showed good linearity (99.9%) in the sensing process and small temperature crosstalk (11 pm/ ̊C). It can be used as a practical and reliable strain force sensor.