Optical Design and Simulation of Interrogator for Fiber Bragg Grating Sensors Based on Linear Variable Filter

Fiber Bragg grating (FBG) sensors have significant advantages in the aviation field. Its multiplexing ability can simplify the detection systems. However, the disadvantage of the FBG measuring system is its interrogator. It has large size, heavy mass, and poor vibration resistance. They limit the application of FBG sensors in the aviation field. Therefore, this paper proposes a new interrogator scheme based on linear variable filter (LVF). According to the LVF principle, an optical theorical model of interrogator was build. The parameters of LVF for the interrogation system were designed and was simulated. The simulation results show that the interrogation system can distinguish 7 FBG sensors at least.