| 581型微震仪設計和試驗結果 |
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| 引用本文： | 許紹燮.581型微震仪設計和試驗結果[J].地球物理学报,1959,8(2):109-122. |
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| 作者姓名： | 許紹燮 |
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| 作者单位： | 中国科学院地球物理研究所 |
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| 摘 要： | 1.前言在地方性微弱地震的观測中,通常总是采用高灵敏度电流計記录地震仪借照相紙感光方法进行記录。但是采用电流計記录方法有它的弱点:首先,仪器的放大特性,在向更高的放大倍数,較寬的頻率特性方向的改善,受到了种种技术条件（如磁鋼強度等）的限制。其次,在高灵敏度电流計記录地震仪中,摆与电流計間的耦合系数口σ2不得不做得很大,因之无論在仪器的理論分析或实际測定它的工作常数,都增加了困难。
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| 关 键 词： | 微震仪 电子管放大器 放大倍数 地震仪 拾震器 频率特性 稳定性 地球物理学 放大特性 地震台 |
DESIGN,CONSTRUCTION AND TESTING RESULTS OF THE TYPE-581 SEISMOGRAPH |
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| Hsu SHAO-HSIEN.DESIGN,CONSTRUCTION AND TESTING RESULTS OF THE TYPE-581 SEISMOGRAPH[J].Chinese Journal of Geophysics,1959,8(2):109-122. |
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| Authors: | Hsu SHAO-HSIEN |
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| Institution: | Institute of Geophysics and Meteorology, Academia Sinica |
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| Abstract: | Type-581 Seismograph is a kind of seismograph for recording small local earthquakes. This instrument consists of three parts, namely the pick-up, amplifier and the recording system. The pick-up is a pendulum （horizontal or vertical） of the ordinary electrodynamic type. The amplifier is of the capacity-resistance coupled, push-pull type, and the recording system is a recorder head with stylus writing on smoked paper. The frequency characteristic response curve and phase characteritics are shown in Fig. 12. The stability of the instrument （amplifier） has been given particular attention. Fig. 11 shows the small variation of the indicator magnification V0 of the instrument, during the 9 months of continuous operation at the Station Peking. It is seen that in the first six months, V0 dropped less than 2% monthly. This can easily be corrected by determination of V0 at suitable time intervals. Fig. 13, 14, 16 are reproductions of actual records of the seismographs. Fig. 15, 16d are records by similar instrument using transistors instead of electronic tubes. |
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