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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σ~2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。而且电流計記
1. INTRODUCTION In the observation of local weak earthquakes, it is usually always recorded by high-sensitivity galvanometer recording seismometers using photographic paper photographic methods. However, the use of ammeter recording method has its weaknesses: First of all, the amplification characteristics of the instrument, to a higher magnification, the direction of the wider frequency characteristics to improve, by a variety of technical conditions (such as the strength of the magnet) restrictions . Secondly, in the high-sensitivity ammeter recording seismograph, the coupling coefficient between the pendulum and the ammeter has to be very large, so both in theoretical analysis of the instrument or in the actual measurement of its working constant Increased difficulties. And current meter