Study on disk vibration sensitization for optical fiber vibration sensing
At present,research direction of optical fiber sensor sensitization is mainly from the angle of changing the structure and composition of the optical fiber itself or through the external packaging process to achieve sensitization effect,which result in a significant increase in the cost and time of sensor research and development.To meet the practical needs of distributed optical fiber sensor system for vibration measurement in seismic prospecting and structural safety monitoring,a disc-type vibration-sensitizing structure based on Mach-Zehnder optical fiber interference is designed,and its sensitivity is deduced by combining elastic mechanics and optical-elastic effect.The influence of disk parameters on sensitivity is analyzed by finite element method,and the size of disk is determined by rational design and optimization of sensitizing structure.The effective working frequency range of the vibration sensor designed based on this structure is 0.1～2.5 kHz,and the sensitivity can reach 6988.2 rad/gn.For a source beyond 60 m,the effective vibration signal can be collected,which can meet the actual needs in the field of vibration monitoring and the economy of the system operation.
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