公开(公告)号：US3646372A

公开(公告)日：1972-02-29

申请号：US3646372D

申请日：1967-06-05

Applicant: NORFIN

Inventor： SNELLMAN DONALD L ,  MARSON RICHARD A ,  DAVIS ERNEST D

IPC: H03K17/955 ,  G01N27/00

CPC classification number: H03K17/955 ,  Y10T307/766

Abstract: Series inductance-capacitance circuit is coupled and tuned to resonance with a constant frequency signal source. The circuit includes capacitance sensor plates which sense the passage of double thickness nonconductive sheets and change the reactance of the circuit to produce a voltage change at the input to the circuit. This voltage change is detected and actuates a switch.

Abstract translation: 串联电感 - 电容电路被耦合并调谐到与恒定频率信号源谐振。 该电路包括电容传感器板，其感测双厚度导电片的通过并改变电路的电抗，以在电路的输入端产生电压变化。 此电压变化被检测并启动开关。