双谐振器敏感结构谐振式传感器

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.分析了这样两个谐振器串联的频率特性,指出在谐振器固有频率点上,两个谐振器串联的相移是180°.给出了双谐振器敏感结构谐振式传感器闭环系统的实现方法,同时分析了当两个谐振器的结构参数不一致时,两个谐振器串联的频率特性.分析结果表明,两个结构参数相差不大的谐振器串联仍然可以构成自激闭环.双谐振器敏感结构谐振式传感器的闭环控制系统中去掉了移相环节,避免了由移相环节产生的相位漂移所引入的测量误差,并有效地提高了传感器的Q值. 

Resonant sensor with double resonators

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. The frequency characteristics of the two resonators in series are analyzed. It is found that the phase shift of the two resonators in series is 180° at the resonator′s nature frequency. Based on the frequency characteristics, the closed loop system of a resonant sensor with double resonators is designed. When the structure and size of the two resonators is not uniform, the frequency characteristics of the two resonators in series are also analyzed. When there is a little difference between the two resonators in series, they can also be used in a resonant sensor. In the closed loop control system, the phase shifter need not be used. The measurement error brought by the phase drift is avoided, and the Q factor of the resonant sensor is effectively increased.