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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。
We designed a portable broadband feedback seismometer and compared it with a standard long-period seismometer (763) and a force-balanced broadband feedback seismometer (STS-1V, STS-1H) and in different interference environments And working conditions have been tested. The result is satisfactory. The seismometer consists of a vertical and two horizontal to the composition. The inertial mass of 0.8kg, natural mechanical vibration period of 15s (seconds), the mechanical quality factor of about 50. A differential capacitive displacement transducer converts the change in the mass of the inertial mass into an electrical signal and the feedback to the electromagnetic system maintains the mass near its equilibrium position. The instrument has flat displacement frequency response over its passband. This is determined by the feedback network, which is equivalent to a displacement-sensing long-period (LP) seismometer with a natural period of 30s plus a second-order low-pass filter system with a cutoff frequency of 0.03s. The instrument has a dynamic range of 100dB and a damping of 0.8. The design focuses on portability, ease of installation, and effective shielding and low power consumption that interfere with the environment.