摘要
基于检波器的Lippmann式短周期地震计利用内部电路提供的高阻尼,拓展检波器的带宽,使其符合流动地震观测的要求.但这种地震计的温度稳定性差且灵敏度低.针对上述缺点,本文根据传感器性能受温度影响的理论模型和前置放大器的设计原理,提出了一种改进的方法:使用负温度系数的温度补偿网络和一种新型的前置放大器来改善地震计的性能.改进的基于检波器的短周期地震计的传递性能在很大的温度范围内不受温度的影响,具有较高的灵敏度和较低的噪声水平.
The geophone-based Lippmann short period seismometer is a seismic sensor which uses the electronic over damping technique to have a reasonable band for seismology.However,this kind of approach has a strong dependence of temperature and also a bad sensitivity.In this paper,based on the theoretic model of the temperature stability and the over damping preamplifier, a negative temperature coefficient compensating resistance and a newly designed preamplifier are applied to deal with these two problems.After a comparative analysis,our approach can achieve a good stability of temperature and a great instrumental sensitivity.
出处
《地球物理学进展》
CSCD
北大核心
2014年第5期2466-2471,共6页
Progress in Geophysics
基金
军控核查技术项目(513310201)资助
关键词
检波器
短周期地震计
温度稳定性
高灵敏度
geophone
short period seismometer
temperature stability
high sensitivity
