反馈地震计低频扩展方法研究  

Study on Low Frequency Expansion Method of Feedback Seismometers

作　　者：吕永清[1,2] 周云耀[1,2] 马鑫[1,2] 吴欢[1,2] 齐军伟[1,2] 杜兴[1] 

机构地区：[1]中国地震局地震研究所(地震大地测量重点实验室),武汉市洪山侧路40号430071 [2]中国地震局地壳应力研究所武汉科技创新基地,武汉市洪山侧路40号430071

出　　处：《大地测量与地球动力学》2017年第4期429-431,435,共4页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震科技星火计划(XH16028);中国地震局地震研究所所长基金(IS201506211)~~

摘　　要：根据反馈地震计的反馈模型推导传递函数,并将其频率特征分解为低频端和高频端两部分。基于反馈模型中低频端频率特性的二阶高通滤波器传递函数,提出低频截止频率扩展的方法,包括降低机械固有角频率ω0、增加摆的质量m、降低灵敏度Sv、增大反馈线圈阻值或减少线径、选用更高电阻率的线圈材料、使用更弱的磁场。通过井下反馈地震计实验,验证了其低频端扩展与理论推导的一致性。The negative feedback seismometer transfer function of the feedback model is broken down into low-end and high-end of the frequency characteristics of the two parts. The low-end of the fre- quency characteristics of the second-order high-pass filter transfer function reveals low-frequency cut- off spreading methods ： reduce mechanical natural angular frequency 020, increase the inertial mass, in- crease the high frequency end of angular frequency ω0, reduce sensitivity Sv, increase the feedback coil resistance, reduce the diameter of the wire, use higher resistivity material coil, use a weaker magnetic field. We use the negative feedback downhole seismometer experiment to test the low end of its ex- pansion and the theoretical derivation of consistency.

关 键 词：反馈地震计 传递函数 低频端扩展 

分 类 号：P315[天文地球—地震学]