CAJ | 학술논문

短周期地震计主要用于观测地方性的微小地震，用速度传感器设计的反馈式短周期的地震计的工作参数稳定性不好，是国内外观测实践都证实了的问题。借鉴位移传感反馈地震计工作参数偏差较低的思路，介绍了通过采用函数变换方法设计速度传感反馈地震计的解决方案。用函数变换方法设计的速度传感反馈地震计，既实现了加大负反馈深度又不降低噪声指标的双重目标，有加深负反馈和由闭环反馈生成的闭环周期位于通带外的优点。即便是机械摆受到环境变化的影响或随时间推移而出现了漂移或老化，其对通带内的幅频特性的影响亦较小。由函数变换电路生成摆函数的工作周期及工作阻尼与机械摆的参数完全无关，仅取决于变换电路中的两个电阻和两个电容的精度。
단주기지진계주요용우관측지방성적미소지진，용속도전감기설계적반궤식단주기적지진계적공작삼수은정성불호，시국내외관측실천도증실료적문제。차감위이전감반궤지진계공작삼수편차교저적사로，개소료통과채용함수변환방법설계속도전감반궤지진계적해결방안。용함수변환방법설계적속도전감반궤지진계，기실현료가대부반궤심도우불강저조성지표적쌍중목표，유가심부반궤화유폐배반궤생성적폐배주기위우통대외적우점。즉편시궤계파수도배경변화적영향혹수시간추이이출현료표이혹노화，기대통대내적폭빈특성적영향역교소。유함수변환전로생성파함수적공작주기급공작조니여궤계파적삼수완전무관，부취결우변환전로중적량개전조화량개전용적정도。
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.