水管倾斜仪观测频带拓展方法研究
A Method for Expanding the Observation Frequency Band of Water Tube Tiltmeters

现有水管倾斜仪可清晰记录长周期固体潮信息，但由于其固有周期高，对短周期倾斜形变无法响应，易导致震前短临异常信息缺失。通过机械结构优化以降低仪器固有周期，拓展仪器的观测频带；采用更高精度的传感器和放大电路提高仪器信噪比，保证固体潮观测正常；最后通过连续对比观测，分析仪器频带拓宽后的观测数据差异。
Water tube tiltmeters can clearly record information from long-period solid earth tides. However, because its natural period is long, it cannot respond to short-period tilt deformation, leading to the missing of short-term anomalous information. In this paper, the natural period of the instrument was reduced and the observation frequency band was expanded through mechanical structure optimization. Through use of sensors with higher precision and amplifier circuit, the signal-to-noise ratio of the instrument was improved, and normal observation of solid earth tide was ensured. By chitinous contrast observation, the difference in observation data after expansion of the frequency band was analyzed