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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 detector-based Lippmann-type short-period seismometer uses the high damping provided by the internal circuit to expand the bandwidth of the detector to meet the requirements of the mobile seismic observation. However, the seismometer has poor temperature stability and low sensitivity. In view of the above shortcomings, In this paper, an improved method is proposed based on the theoretical model of the temperature dependence of the sensor performance and the design principle of the preamplifier: the temperature compensation network with a negative temperature coefficient and a new type of preamplifier are used to improve the performance of the seismometer. The transmission performance of the geophone-based short-period seismometer is unaffected by temperature over a wide temperature range, with high sensitivity and low noise level.