Research of High-Speed FBG Demodulation System for Distributed Dynamic Monitoring of Mechanical Equipment

• Main Authors: Zhengying Li, Zhiqiang Xu, Zhihao Tang, Meng Zhao, Linjun Cai, Quan Liu
• Format: Article
• Language: English
• Published: SAGE Publishing 2013-01-01
• Series: Advances in Mechanical Engineering
• Online Access: https://doi.org/10.1155/2013/107073

This paper designs and implements the high-speed FBG demodulation system which can demodulate multiple FBG sensors (up to 64 sensors in series per channel) of 4 channels synchronously. The system is based on the method of tunable F-P filter. Both the nonlinear effect and the temperature drift effect of the F-P filter are eliminated by applying the triangular-like drive signal and reference channels. In addition, a high-speed adaptive algorithm for peak-find is designed for the system. The experiment results show that, for the whole system, the stability is 2 pm, the resolution is 1 pm, the linearity is 0.999, the measurement precision is 20 pm, and the demodulation frequency is 4 kHz. Consequently, the system is very suitable for distributed dynamic monitoring of complicated mechanical equipment.