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一、概况用短周期拾震器作长周期地震波的记录,从而获得很好的零点稳定性以适应较恶劣的工作环境,这一课题是当前地震仪研制的重要方向。目前国内外多用有源器件作反馈达到此目的,而用无源器件电容反馈元件延长摆的周期虽然已提出多年,但在实际应用上取得成果,还见得很少。我们从实际需要出发,在前人工作的基础上作了研究。推导了电容延长周期后的频率特性,给出了有关元件选择的计算公式并探讨了稳定性、灵敏度和周期三量的相
I. Overview The use of short-period pick-up for long-period seismic wave recording, in order to obtain good zero stability to adapt to the harsh working environment, this issue is an important direction for the development of seismometers. At present, multi-purpose active devices at home and abroad are used for feedback to achieve this goal. However, the passive-device capacitance feedback components have been proposed for prolonged periods, but many achievements have been made in practical applications. From the actual needs, we made a study based on the work of our predecessors. The frequency characteristics of the capacitor after the extended period are deduced. The formula for the selection of the components is given and the three phases of the stability, sensitivity and period are discussed