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29 November 2011 Fiber Bragg grating dynamic demodulation based on non-equilibrium interferometry
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Proceedings Volume 8311, Optical Sensors and Biophotonics III; 83112K (2011)
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China
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.
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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);

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