| KFD——宽频带大动态反馈地震计的设计和性能 |
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| 引用本文： | 马庆芸,叶林才,冯玉华,郭玲.KFD——宽频带大动态反馈地震计的设计和性能[J].地震学报,1987,9(1):89-100. |
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| 作者姓名： | 马庆芸 叶林才 冯玉华 郭玲 |
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| 作者单位： | 国家地震局地球物理研究所 |
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| 摘 要： | 我们设计了一种便携式的宽频带反馈地震计,并与标准长周期地震计(763)及力平衡式宽频带反馈地震计(STS-1V,STS-1H)作了比较,并在不同干扰环境及工作条件下进行了考验.结果是令人满意的.地震计由一台垂直向和两台水平向组成.其惯性质量为0.8kg,自然机械振动周期为15s(秒),机械品质因素约为50.用一差动电容位移换能器将惯性质量的位移变化转变成电信号,而加于电磁系统的反馈使质量维持在它的平衡位置附近.该仪器在其通带范围内具有平坦的位移频响特性.这由反馈网络决定,它相当于一个具有30s 自然周期的位移传感长周期(LP)地震计加上截止频率为0.03s 的二阶低通滤波器系统.该仪器的动态范围为100dB,阻尼为0.8.设计中着重考虑便携性,安装方便以及对环境干扰的有效屏蔽及低功耗.
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DESIGN AND PERFORMANCE OF THE KFD--WIDEBAND,LARGE DYNAMIC RANGE FEEDBACK SEISMOMETER |
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| Affiliation: | Institute of Geophysics ,State Scismological Bureau |
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| Abstract: | A portable wideband feedback seismometer has been developed and compared with a conventional seismometer (Model Type 763) and force balance type wideband feedback seismometer system (STS-1V, STS-1H). Experiments of environmental disturbance and operating conditions have also been made, with satisfactory results.The seismometer has one vertical component and two horizontal components. Each employs an inertial pendulum of mass 0.8kg which has a natural period of 15 sec. The mechanical Q factor is about 50. Displacements of the mass are detected by a differential capacitive transducer and feedback is applied via an electromagnetic system to maintain the mass stationary with respect to its supports.The overall response, which is defined by the feedback, has a flat response to displacement over the passband. It is identical to that of the displacement sensor of an LP seismometer with a natural period 30 sec and a second order low pass filter with a cutoff at 0.03 sec. The instruments have a dynamic range of 100 dB and damp of 0.8.The main considerations in the design are portability, convenience of installation, efficient .shielding against environmental disturbance and low power consumption. |
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