阶梯电容式水位测量系统的研究

构建了十一阶梯电容式水位测量系统，使阶梯平台与水位线一一对应，每个平台的输出电容量与水位变化保持函数关系．为减小因非线性元件过多而引起的误差，谊构建方案放弃了传统的桥式、双T网络、运算放大等电路，设计并采用了LC谐振电路．经多次实验结果表明，采用阶梯电客式传感器和LC谐振电路，不但能够有效地提高整个系统的灵敏度与稳定性，而且测量结果也比较理想，其与理论值的平均误差为2．3％．

Investigation on Water Level Measuring System of Laddered Capacitor

The paper constructs a system of measuring water levels by the sense of capacitance of eleven terraces. Each of the terraces corresponds with a water level, and the capacitance output by each terrace is the function of water level variations, i. e. the construction shows the stable foundation of the system distinctly. In the process of translating the sensing capacitance into the voltage of the system, the double T net of bridge, the circus of computing and amplifying, etc, are abandoned, and the method of LC resonance is adopted. The experiments results showed that not only improve the sensibility and stability of whole system, but also illuminate that the result of the experiment is perfect. It worth points out to that the average error here is just 2. 3M compared with calculated values.