光纤光栅传感器解调技术研究

Fiber Grating, a fiber-passive device, is widely applied in spaceflight and civil engineer field, and thus has bright future. Demodulation is the key point for the application of fiber grating sensors, with the function of reflecting the relationship of wavelength and the measured objects. We introduce the fundamental principles of fiber grating sensors, and analyze six demodulation methods: filtering, interference, tunable light source demodulation, chirp fiber grating detecting, fiber grating dispersing, and compound-based interference demodulation. We analyze fundamental principles of these six demodulation methods, evaluate the performances of each demodulation method, and compare the merits and shortcomings.