Fiber Bragg grating dynamic demodulation based on non-equilibrium interferometry

Qi Yu; Zhenguo Jing; Wei Peng; Xinpu Zhang; Yun Liu; Chuanqi Xing; Hong Li; Wenjuan Yao

doi:10.1117/12.905602

29 November 2011 Fiber Bragg grating dynamic demodulation based on non-equilibrium interferometry

Qi Yu, Zhenguo Jing, Wei Peng, Xinpu Zhang, Yun Liu, Chuanqi Xing, Hong Li, Wenjuan Yao

Proceedings Volume 8311, Optical Sensors and Biophotonics III; 83112K (2011) https://doi.org/10.1117/12.905602
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China

Abstract

Non-equilibrium interferometric Fiber Bragg Grating (FBG) sensor is suitable for the accurate measurements of high-frequency dynamic stress, vibration, etc because of its high sensitivity and high frequency response compared to other types of FBG sensors. In this paper, a Phase Generation Carrier (PGC) demodulation technique of non-equilibrium interferometric FBG sensor that based on ARCTAN algorithm by using an arctangent algorithm with a simple method, has been investigated ,which can avoid the high-frequency noise increases, the error accumulation, the integrator signal jump of the integrator and other inherent weaknesses in the system. ARCTAN has a better response characteristic of the mutant signals, especially for low-frequency large-signal that can be demodulated with a greater range. The experimental result demonstrate that implementing measured resolution can up to 10nε/√Hz@500Hz in vibration strain, a signal sampling rate to 100 KHz and a frequency response range up to 1 KHz. This method can improve the performance of the system greatly which has potential significance for practical sensor application.

Citation Download Citation

Qi Yu, Zhenguo Jing, Wei Peng, Xinpu Zhang, Yun Liu, Chuanqi Xing, Hong Li, and Wenjuan Yao "Fiber Bragg grating dynamic demodulation based on non-equilibrium interferometry", Proc. SPIE 8311, Optical Sensors and Biophotonics III, 83112K (29 November 2011); https://doi.org/10.1117/12.905602

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KEYWORDS

Fiber Bragg gratings

Demodulation

Sensors

Interferometry

Interferometers

Ferroelectric materials

Modulation

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