Design And Study On The Vibration Acceleration Measutement System Of FBG

With the improving technique and the emergence of more and more advance research production, fiber Bragg grating(FBG) had become one of the most successful optic passive device. FBG is produced in fiber core. It is used conveniently and Bragg reflected wavelength can be modulated by temperature, strain and so on, FBG is modulated by wavelength and easily distributed measure. So it is widely used in sensor field. In this thesis, based on analysis of domestic and foreign study actualities on vibration acceleration sensor, a new vibration acceleration measurement system is designed based on fiber Bragg grating.First, staring with sensing principle of FBG, focuses on systematic analysis of the strain sensing properties of FBG. Following, based on the analyzing of mechanics model and latent equation of acceleration sensor, it is designing acceleration measurement sensor-head based on equi-intensity cantilever beam. And processing theory-calculate is to approve the system can achieve acceleration measurement.Next, on the basis of analyzing advantages and disadvantages of familiar demodulation techniques, a novel FGB linear edged demodulation method based on fiber Mach-Zehnder interferometer is proposed to realize signal demodulation of FBG sensing system. The demodulation technique is applicable for dynamic measurement, liable to actualize relative detection of all-optical network. Further, in the thesis the vibration acceleration measurement system on FBG is proposed, and particularly introduced the components of the system.Last, based on the analysis of the theory, the system of experiment is designed and processing simulink experiment of dynamic signal, proved this vibration acceleration measurement system can realize the high-accuracy measurement. Further, the error of the measurement system is being analyzed,and proposed the method for improving system and monishing error.