Simultaneous Measurement of Temperature and Strain Using Spheroidal-Cavity-Overlapped FBG

Author

Yuheng Pan ; Tiegen Liu ; Junfeng Jiang ; Kun Liu ; Shuang Wang ; Jinde Yin ; Pan He ; Jinling Yan

Author_Institution

Key Lab. of Optoelectron. Inf. Technol., Tianjin Univ., Tianjin, China

Volume

7

Issue

6

fYear

2015

Firstpage

1

Lastpage

6

Abstract

We demonstrated a fiber-optic sensor using spheroidal-cavity-overlapped fiber Bragg grating (FBG) for simultaneous temperature and strain sensing. The spheroidal cavity is fabricated through splicing two sections of the photon-sensitive fiber together and located in the center of the FBG to act as a Fabry-Pérot interferometer (FPI). Experimental results demonstrate that the temperature sensitivity of the FPI part of the sensor is 0.67 pm/°C at the range of -70 °C-20 °C, and its strain sensitivity is 3.76 pm/με at the range of 0-500 με, while those of the FBG part are 8.40 pm/°C and 1.40 pm/με, respectively. The sensitivity difference ensures good simultaneous measurement performance.

Keywords

Bragg gratings; Fabry-Perot interferometers; fibre optic sensors; optical fibre fabrication; splicing; strain measurement; temperature measurement; Fabry-Pérot interferometer; fiber-optic sensor; photon-sensitive fiber; spheroidal-cavity-overlapped FBG; spheroidal-cavity-overlapped fiber Bragg grating; splicing; strain measurement; temperature -70 C to 20 C; temperature measurement; Cavity resonators; Fiber gratings; Optical fiber sensors; Strain; Temperature measurement; Temperature sensors; FBG; Fabry-Perot; Fabry???P??rot; Fiber optics sensor; fiber Bragg grating (FBG); temperature and strain simultaneous measurement;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2015.2493724

Filename

7305781