Real-Time Interrogation of a Linearly Chirped Fiber Bragg Grating Sensor for Simultaneous Measurement of Strain and Temperature

Author

Liu, Weilin ; Li, Wangzhe ; Yao, Jianping

Author_Institution

Microwave Photonics Res. Lab., Univ. of Ottawa, Ottawa, ON, Canada

Volume

23

Issue

18

fYear

2011

Firstpage

1340

Lastpage

1342

Abstract

We propose and demonstrate a novel approach to real-time interrogation of a high-birefringence linearly chirped fiber Bragg grating (Hi-Bi LCFBG) for simultaneous measurement of strain and temperature based on chirped microwave pulse compression with increased resolution and signal-to-noise ratio (SNR). A theoretical analysis is developed, which is validated by an experiment. The experimental results show that the proposed system can provide a resolution better than ± 1.2 °C and ± 13.3 με at an interrogation speed of 48.6 MHz.

Keywords

fibre optic sensors; optical pulse compression; strain measurement; temperature measurement; chirped microwave pulse compression; frequency 48.6 MHz; high-birefringence linearly chirped fiber Bragg grating; linearly chirped fiber bragg grating sensor; real-time interrogation; signal-to-noise ratio; strain measurement; temperature measurement; Chirp; Fiber gratings; Strain; Strain measurement; Temperature measurement; Temperature sensors; Chirped fiber Bragg grating (CFBG); chirped microwave pulse; interrogation; sensor; wavelength-to-time mapping;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2011.2160624

Filename

5930340