Title :
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
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2443134
