涡流检波器动特性的研究

Research on Dynamic Characteristic of Eddy Acceleration Geophone

综合考虑检波器磁路系统中外壳磁靴等部件的电磁感应对固定线圈感应电流的影响 ,建立了涡流地震检波器的七参数机电磁动力学模型 ,分析了参数的影响范围 ,并与四参数模型进行了对比 .理论分析及测试结果表明 ,外壳磁靴系统的附加耦合效应主要影响检波器在中高频段的频率特性 ,因此七参数模型能够较四参数模型更为准确地描述检波器的中高频段频率特性 .研究结果可为检波器的特性研究。

A seven parameter electromechanical dynamic model of the eddy geophone is derived, where the effects of electromagnetic induction of the shell and the magnet shoes on the induced current of fixed coil are considered. Its accuracy is compared with that of the four parameter model through the parameter identification experiments of two kinds of eddy geophone. The influences of the parameters on dynamical characteristic of geophone are numerically analyzed for the seven parameter model. The numerical and experimental results indicate that electromagnetic induction of the shell and the magnet shoes mainly affects the dynamical characteristic of the eddy geophone in the medium and high frequency domain and thereby the present seven parameter model can describe more accurately dynamical characteristic of the eddy geophone within broad frequency band, which lays a foundation for parameter identification.