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

Abstract EN

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.