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

Volume

11

Issue

11

fYear

2011

Firstpage

3019

Lastpage

3022

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);

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2011.2157124

Filename

5771523