公开(公告)号：US06486680B1

公开(公告)日：2002-11-26

申请号：US09593081

申请日：2000-06-13

申请人： Dennis Keith Mull

发明人： Dennis Keith Mull

IPC分类号： G01R2726

CPC分类号： G01B7/048 ,  B65H7/04 ,  B65H23/0216 ,  B65H2511/514 ,  B65H2515/712 ,  B65H2553/23 ,  B65H2701/131 ,  B65H2220/01 ,  B65H2220/03

摘要： A capacitance measuring circuit having a sensor electrode and a reference electrode that are spaced apart so that a material can be positioned between the two electrodes. A first polarity and a second polarity voltage source are used to charge the sensor electrode and a switch controller controls the charging and discharging of a capacitor by the sensor electrode. The charge on the capacitor after being charged and at least partially discharged by the sensor electrode represents the capacitance between the sensor electrode and the reference electrode. The charge on the capacitor is used to measure the position of the material relative to the sensor and reference electrode. The measuring circuit also has a system parasitic controller to measure and adjust for system parasitic capacitance in the measuring circuit.

摘要翻译： 一种电容测量电路，其具有间隔开的传感器电极和参考电极，使得材料可以位于两个电极之间。 使用第一极性和第二极性电压源来对传感器电极进行充电，并且开关控制器通过传感器电极控制电容器的充电和放电。 电容器被充电并由传感器电极至少部分放电之后的电荷表示传感器电极和参考电极之间的电容。 电容器上的电荷用于测量材料相对于传感器和参比电极的位置。 测量电路还具有系统寄生控制器，用于测量和调整测量电路中的系统寄生电容。