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GS15重力仪是静力式螺旋状弹簧重力仪。仪器的检测系统是一种电容换能开环检测系统。我们从1982年开始对GS15(No231)重力仪采用电磁反馈方法进行改装。把原来开环检测系统改为闭环检测系统。并用数字磁带、以不同频率作采样记录。这样,就使该台仪器的摆杆处于零位,即电容电桥的平衡位置。同时在输出端可分别记录重力潮汐信息和叠加在潮汐曲线上反映重力仪摆杆通过平衡位置时的瞬时信息。并将该信号加以专门放大输出。所有信息都同时采用模拟和数字采样记录。 观测试验表明,采用电磁反馈和数字采样记录有如下优点: (1) 提高重力潮汐的观测质量。由于重力仪摆杆处于零位,仪器稳定性增加了。并使记录格值标定准确,且完全线性。仪器灵敏度保持不变。在专门放大的高频输出信息上,可了解噪声的频谱分布,以便构制数字滤波器,以代替该仪器原有100秒的有源滤波器,从而使潮汐相位不致失真。 (2) 利用重力仪摆杆过零位专门放大的高频信息,可开展非潮汐高频信息的研究,探讨地面脉
GS15 Gravimeter is a static spiral spring gravimeter. Instrument detection system is a capacitor to open loop detection system. We started to retrofit the GS15 (No231) gravimeter with electromagnetic feedback since 1982. The original open loop detection system to closed loop detection system. And use digital tapes to sample and record at different frequencies. In this way, the pendulum of the instrument is put in the zero position, that is, the balance position of the capacitor bridge. At the same time, gravitational tide information and instantaneous information superimposed on the tidal curve to reflect the gravitational force pendulum passing the balance position can be separately recorded at the output end. And the signal to a special amplification output. All information uses both analog and digital sample records. Observations show that the use of electromagnetic feedback and digital sampling records the following advantages: (1) to improve the quality of gravity tide observations. As the gravimeter pendulum at zero, the stability of the instrument increased. And make the grid value calibration accurate, and completely linear. Instrument sensitivity remains unchanged. In the specially amplified high-frequency output information, we can understand the spectral distribution of noise in order to construct a digital filter to replace the original 100-second active filter of the instrument so that the tidal phase is not distorted. (2) Using the high-frequency information specially amplified by the gravitational pendulum rod zero crossing, we can carry out the research on the non-tidal high-frequency information to explore the ground veins