宽频带地震计数字反馈技术

摘要

The invention of feedback seismometer has a signiifcant meaning in seismometer development. Large dynamic and broadband technology has become the mainstream of contemporary seismic observations. The application of digital technology is the development direction of seismometer. Traditional broadband seismometer with analog feedback technology has high self-noise in the low frequency, and the system is very sensitive to environmental changes, too. So we introduced digital feedback technology to optimize long-period noise of seismometer, and improve system stability. Moreover, this is the ifrst time to achieve program-controlled period of seismometer.%反馈式地震计的出现在地震计发展历史上具有划时代意义，大动态、宽频带已经成为当代地震观测的主流技术，数字技术应用是地震计的发展方向。采用模拟反馈技术的宽频带地震计存在低频段自噪声高及系统受环境影响大等问题。实验结果显示，通过引入数字反馈技术，可以优化地震计的长周期噪声，提高系统稳定性，首次实现程控配置地震计的周期。