Research Of Fiber Bragg Grating Accelerometer Based On Composite Material

With the major equipment and projects strutural systems direct to large-scale, continuous,high-speed,efficient,gentle and automation developing,its dynam-ics is becoming increasingly complex.How complex and hostile environment,in thesuper-load operating conditions, its accurate dynamic testing and analysis to ensure the health status monitoring of the normol equipment and safety of the project has increasingly important.Currently,wide range of applications of electromagnet-ic acceleration sensor can not meet the remote transmission environments,because of anti-interference ability and poor long-term stability. The traditional cantilever FBG accelerometer is not able to improve the performance of structural limitatio-ns,Both unable to meet large-scale structure of the vibration monitoringneeds. Therefore, research and development of a new type of fiber Bragg grating acce-lerometer have a great significance.This thesis is based on the basic theory and experiment of fiber Bragg grati-ng accelerometer, combined with the ANSYS Parametric optimal design method, From materials, components, structures and other aspects discusses the design theory based on a composite of fiber Bragg grating accelerometer, And expect the design and production of high-sensitivity low-frequency fiber Bragg grating accelerometer can be applied to the vibration monitoring of large-scale structural engineering to meet the harsh and complex environment.Frist,based on fiber grating sensor theoretical analysis of the basic principles and dynamic characteristics of the fiber grating acceleration sensor,for the deficienc ies of the existing acceleration sensor, proposed the structure of double spring offi-ber Bragg grating accelerometer, and from materials and structures to optimize the design.Second,for the characteristics of the structure of double spring acceleration se-nsor and insufficient flexibility of the existing metal matrix structure,proposed elastic structure of the carbon fiber composite senser;system of laminated comp-osite plate design theory and molding process,designed and fabricated for sens-er flexible structure of the carbon fiber composite.And the system mechanical properties of experimental,get the carbon fiber composite elastic structure to meet acceleration senser parameters required(elastic modulus is about145GPa).Third,depending on the application object environment and measurement req-uirements,combined with the design of high-sensitivity low-frequency fiber bra-gg grating accelerometer, summed up the design theory and method of carbon fiber bragg grating accelerometer.Namely use the ANSYS software establish the senser's static and dynamic characteristics analysis methods, APDL language to write the optimization of analytical procedures and control procedures,and iterat-ive calculation to get the optimal structure of the senser.followed the optimal structure modal analysis, harmonic response analysis and horizontal sensitivity analysis by the ANSYS software.Four,research the processing and packaging technology of the optimal struct-ure sensor,and experimental analysis and error analysis,more consistent with the relevant conclusions and theoretical analysis.sensor resonant frequency is51Hz,the amplitude-frequency0-35Hz,sensitivity is1.247nm/g,reached a high level of sensor performance.