公开(公告)号：US5038110A

公开(公告)日：1991-08-06

申请号：US371509

申请日：1989-06-26

申请人： Hans Braun ,  Uwe Kessler

发明人： Hans Braun ,  Uwe Kessler

IPC分类号： G01P3/80 ,  G01D5/22 ,  G01D5/24

CPC分类号： G01D5/2405

摘要： A capacitive difference sensor includes two sensor electrodes, each of which lies opposite a transmitting electrode fed by an electrical AC voltage source. A circuit arrangment connected to the two sensor electrodes for signal recovery generates a differential signal which corresponds to the difference between the displacement currents induced in the two sensor electrodes. The circuit arrangement includes a series resonance circuit comprising a coil and a capacitor, the resonance frequency of the series resonance circuit corresponding to the frequency of the AC voltage source. The two sensor electrodes are coupled via a transformer in opposite senses to the series resonance circuit and the differential signal is tapped off at the tap of the series resistance circuit formed by the connecting point between the coil and the capacitor.

摘要翻译： 电容差分传感器包括两个传感器电极，每个传感器电极与由AC电压源馈送的发射电极相对。 连接到用于信号恢复的两个传感器电极的电路布置产生对应于在两个传感器电极中感应的位移电流之间的差的差分信号。 电路装置包括串联谐振电路，其包括线圈和电容器，串联谐振电路的谐振频率对应于AC电压源的频率。 两个传感器电极通过变压器以相反的方式耦合到串联谐振电路，并且差分信号在由线圈和电容器之间的连接点形成的串联电阻电路的抽头处被分接。