Designing Feedback Seismometer with a Velocity Transducer by a Function Transforming Method
HUANG Min
YANG Xiaoyuan
SHAO Yuping
Abstract：Short-period seismometer is mainly used for local microseismic monitoring. However, the operation parameter stability of feedback short-period seismometer with a velocity transducer is poor, which has been confirmed by domestic and international practical observation. Learning from feedback seismometer with a displacement transducer, the paper introduced the designing feedback seismometer with a velocity transducer by a function transforming method. By using this method, the feedback seismometer with a velocity transducer designed increases feedback depth, meanwhile, do not reduce noise index. One of the advantages of this scheme is to deepen feedback, the other is that closed-loop period is outside the pass band. Even if the mechanical pendulum is affected by environmental changes or with time there has been drift or aging, its influence on the amplitude frequency characteristics in the passband is also small. Operation period and damping of seismometer generated by function transforming method have nothing with the parameters of mechanical pendulum, only depend on the accuracy of two resistor and two capacitor in the conversion circuit.
Keywords：Function transformingFeedbackOperation parameter
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 41-48 )