摘要
反馈地震计自身的噪声输出决定了它的动态范围下限。反馈地震计的噪声主要由反馈环内有源器件产生。速度传感反馈地震计的环路参数和滤波类型将会影响环内不同位置的噪声输出传递函数。本文分析了4种一阶环路滤波器和零阶环路滤波器对环内噪声传递函数的影响,开环阻尼D1较小的一阶极点高通、一阶零点高通和双一阶环路滤波在抑制前向通道噪声输出方面具有潜力;一阶极点高通在抑制反向通道低端带外噪声输出方面有较好的性能。
Lower limit for dynamic range of feedback seismometer is decided by the noise output of itself. The noise of feedback seismometer causes primarily by active devices in the feedback loop. The loop parameters and filter types of feedback seismometer with a velocity transducer will affect the noise transfer function of different position in the loop. The influence on the noise transfer function in the loop caused by four compared in the paper. Consequently, with high-pass filter, and first-order zero high-pa of numerator and denominator are all nonzer lower SS O, first- open filter and have the order and zero-order loop filters are -circuit damping D1, first-order pole first-order loop filter whose factors potential to restrain the noise output of forward channel. First-order pole high-pass does well in restraining out-of-band noise output on the low side of backward channel.
出处
《地震地磁观测与研究》
2007年第5期43-49,共7页
Seismological and Geomagnetic Observation and Research
关键词
反馈地震计
噪声输出
传递函数
信号调理
feedback seismometer, noise output, transfer function, signal condition
