提出一种采用双谐振器敏感结构的谐振式传感器，传感器的敏感元件包括两个结构参数一致的谐振器，传感器的闭环控制系统由两个幅度控制器和一个反相器组成。
A new resonant sensor consisting of two resonators of uniform structure and size is presented. The closed loop control system is composed of two amplitude controllers and an inverter.
每个拆卷机上，膜都是包裹在负载单元式卷轴上的，这样就能监测膜的张力，为电自动的闭环张力控制器提供反馈的信号。
At each unwinder the film wraps around a load-cell-mounted roller, which monitors the film tension, providing the feedback signal for electronic automatic closed-loop tension control.
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