力平衡反馈技术在石英水平摆倾斜仪中的应用研究

石英水平摆倾斜仪在前兆地震观测中得到了广泛的应用，取得了较好的观测数据，但是仍然存在一些不足，如灵敏度未知、频率特性不理想等.为解决这些问题，本文提出一种基于力平衡反馈技术的石英水平摆倾斜仪设计方法.该方法通过差动式电容换能器检测摆锤的位置信息，将其转换成电信号输出；同时通过电子线路将输出电压信号处理后反馈给摆锤，该反馈电压在摆锤上产生一静电力.根据该设计方法，我们研制了原理样机并进行了测试，结果表明，样机的灵敏度为16801V/（m·s^-2），样机的幅度响应在从DC到5s都是平坦的.

Research of applying force balance feedback technique to the quartz horizontal-pendulum tiltmeter

Quartz horizontal-pendulum tiltmeter has been widely used in earthquake precursory observation, and has got a lot of good observation data. However, it still has some limitations such as that the sensitivity is unknown before on-site installation, the frequency characteristic is not ideal and so on. To conquer these problems, we propose a method of designing quartz horizontal-pendulum tiltmeter based on force balance feedback technique. This method utilizes differential capacitance transducer to detect the pendulum's position and converts it into electric signal for output. It also sends the output signal back to the pendulum via feedback electric circuit. This feedback voltage will produce a force on the pendulum. On basis of the proposed method, we have developed a prototype and tested its performance. The results show that the sensitivity of the prototype is 16801 V/(m·s^-2), and the amplitude response is flat within the frequency range of DC to 5 s.