Title :
Temperature-Independent Fiber Bending Sensor Based on a Superimposed Grating
Author :
Dong, Xinyong ; Liu, Yang ; Shao, Li-Yang ; Kang, Juan ; Zhao, Chun-liu
Author_Institution :
Inst. of Optoelectron. Technol., China Jiliang Univ., Hangzhou, China
Abstract :
A compact fiber bending sensor has been presented by superimposing a uniform fiber Bragg grating (FBG) into a tilted fiber Bragg grating (TFBG). The reflection of FBG is modulated by the same bandwidth of the cladding modes of TFBG, which is sensitive to the bending of fiber. By monitoring the differential Bragg reflection between FBG and TFBG, the sensor is insensitive to ambient temperature changes and power fluctuations from light source or fiber link during the measurement. The sensitivity of the sensor is also doubled because the signal from FBG passes through the TFBG twice.
Keywords :
Bragg gratings; fibre optic sensors; light reflection; optical fibre cladding; optical variables measurement; FBG reflection; TFBG; cladding modes; differential Bragg reflection monitoring; fiber link; light source; power fluctuation; superimposed grating; temperature-independent fiber bending sensor; tilted fiber Bragg grating; Fiber gratings; Optical fiber amplifiers; Optical fiber sensors; Temperature measurement; Bending measurement; fiber-optic sensor; superimposed grating; tilted fiber Bragg grating (TFBG);
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2011.2157124
