用于容性传感元件的线性交流桥路的自动平衡  

Automatic Balancing of Linear AC Bridge Circuit for Capacitive Sensor Elements

作　　者：王宝珠[1] 温鸣[1] 王艳菊[1] 

机构地区：[1]河北工业大学电气系,天津300130

出　　处：《河北工业大学学报》1997年第1期82-85,共4页Journal of Hebei University of Technology

摘　　要：常规的桥路借助于微调电阻和电容的机械变动来达到平衡．众所周知，在多数情况下是很困难的．而且通常的交流桥路对容性传感元件变化的响应是非线性的．而利用标准运算放大器就可以容易地获得线性的桥路输出．本文推出了一种线性桥路的理论模型，并用实验证明了由理论预测的线性桥路的优良特性；给出了一种用于桥路平衡的自动化方法．Conventional bridge circuits are balanced by means of mechanical changes of trimming capacitances and resistances. It is a well - known fact that this can be very difficult in many situation. Ordinary AC - bridge circuits are nonlinear with respect to changes of the capacitive sensor element. Using some standard operational amplifiers is easy to obtain a linear bridge circuit output. In this article a theoretical model of tile linear bridge circuits is derived. The excellent performance of the linear bridge circuit predicted by theory is verified by practical experiments,an automatic method for bridge circuit balancing is presented.

关 键 词：交流桥路 电桥平衡 容性传感器 线性桥路 

分 类 号：TM131.4[电气工程—电工理论与新技术]