论文部分内容阅读
研究了一种基于边缘电场效应的双线制电容式水位传感器及其测量电路的软硬件设计.传感器利用一根双芯电线作为敏感单元,能够将水位的高低线性转换为电容量的变化.双芯电线内的两个铜芯分别作为电容式传感器的两个电极.待测的水被绝缘皮隔离在双芯电线的周围.由于两铜芯间的边缘电场的存在,水位的变化会影响两铜芯之间的电容量,因此水位值可通过测量该电容量计算出来.利用测量电路对传感器的测量结果表明:传感器的电容量随水位线性变化,精度为1mm.水位上升时,传感器反应非常灵敏.但水位下降时,传感器的灵敏度略有迟缓.当水位在10秒内从0.9米快速下降到零水位,传感器的响应时间为1分钟.
A two-wire capacitive water-level sensor based on fringing electric field effect and the hardware and software design of the measuring circuit are studied.The sensor uses a dual-core wire as the sensitive unit and can convert the water level linearly into the capacitance change. The two copper cores in the core wire serve as the two electrodes of the capacitive sensor, respectively, and the water to be measured is isolated by the insulation sheath around the double-core wire. Due to the electric field at the edge between the two copper cores, The capacitance between the copper core, so the water level value can be calculated by measuring the capacitance.Using the measuring circuit of the sensor measurement results show that: the sensor capacitance changes linearly with the water level, the accuracy of 1mm. When the water level rises, the sensor reaction is very However, when the water level drops, the sensitivity of the sensor is slightly delayed. When the water level quickly drops from 0.9 meters to zero water level in 10 seconds, the sensor response time is 1 minute.