Li Qiaoyi

A fiber grating temperature demodulator based on the tunable F-P filter

In order to improve the all kind of fiber Bragg grating (FBG) demodulation system, we make-up a fiber grating temperature demodulation system, which is consist of fiber tunable F-P filter, signal-generation, tunable voltage source and oscilloscope. The temperature signal of three FBG with different center wavelength is demodulated, and the system is demonstrated to be with sensing sensitivity of 10.47mV/°C, 10.16 mV/°C, 10.48 mV/°C. The structure of the system is very simple and easy to be realized.

The simulation of FBG demodulation system based on the tunable F-P filter

This paper implements the optical filter fiber Bragg grating (FBG) sensor demodulation system based on the tunable Fabry-Polo (F-P) filter. Paper firstly introduces the FBG sensor demodulation system block diagram; Then we uses the Optisystem software to build a virtual system and set parameters and obtain the simulation result that the optical power with the frequency has a good linear relationship; Finally we makes experimental verification finding that Simulation results are consistent with the experimental results.

FBG multiplex distance based on FMCW technology

The basic principles of Frequency Modulated Continuous Wave (FMCW) multiplexing technique addressing the distributed fiber Bragg grating (FBG) sensors were studied, and the theoretical analysis of FBG multiplex distance were carried out; In order to analyze the impact on the spectrum signal, when the FBG multiplex distance is integer or non-integer multiple of system minimum resolution distance, for the FMCW multiplexing scheme was simulated. Finally, the related experimental system was established and the results are consistent with the theory.