A Highly Sensitive Temperature Sensor Based on Power Changes of Fiber Bragg Grating Pairs

Author

Guoyu Tang ; Rong Wang ; Wei Zhou ; Meichao Yang ; Mingyu Wu ; Xiaofeng Xu

Author_Institution

Key Lab. of Coherent Light, Atomic & Mol. Spectrosc. of Minist. of Educ., Jilin Univ., Changchun, China

Volume

27

Issue

17

fYear

2015

fDate

Sept.1, 1 2015

Firstpage

1806

Lastpage

1808

Abstract

A highly sensitive temperature sensor based on power change of double fiber Bragg gratings (FBGs) structure is proposed in this letter. It consists of two identical FBGs (FBG1, FBG2), in which the Bragg wavelength of FBG1 is modulated by the temperature and its reflecting light is injected into FBG2. Thus, the power difference of two peaks that appear in the transmission spectrum of FBG2 can be modulated by temperature around FBG1. By shifting the Bragg wavelength of FBG2, the sensor can achieve the segmental measurement of temperature. In the experiment, dynamic range of 25 °C-135 °C and sensitivity of 1.35 ± 0.02 dBm/°C have been achieved.

Keywords

Bragg gratings; fibre optic sensors; temperature sensors; Bragg wavelength; FBG1; FBG2; double fiber Bragg gratings structure; fiber Bragg grating pairs; highly sensitive temperature sensor; power changes; reflecting light; segmental measurement; temperature 25 degC to 135 degC; transmission spectrum; Fiber gratings; Optical fibers; Sensitivity; Temperature measurement; Temperature sensors; Wavelength measurement; Fiber Bragg Grating; Fiber Bragg grating; Optical fiber sensor; optical fiber sensor; power difference; temperature measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2015.2443134

Filename

7120921