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

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3 Author(s)
Weilin Liu ; Microwave Photonics Res. Lab., Univ. of Ottawa, Ottawa, ON, Canada ; Wangzhe Li ; Jianping Yao

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:23 ,  Issue: 18 )