对称恒定电流激励动态应变测量技术的 分析与应用研究

对称恒定电流激励技术是使用一对匹配的恒定电流源激励只有一个工作应变片的应变测量方法.这项技术提供了非常强的抑制静电噪声拾波干扰的能力,应用于只要求使用2线连接的动态应变测量或应变型传感器这种无抗干扰连接的方式.文章介绍了这种新型动态应变测量技术的特点,并与传统的使用惠斯顿电桥和单端恒定电流源激励的技术进行了比较.此技术还可以提供检测传感器健康状态和连接电缆状态的方法.

Balanced constant current excitation for dynamic strain measurements

The balanced constant excitation is achieved by using a pair of matched constant current sources to excite a single active strain gage.The technique provides enhanced reduction of electrostatic noise pickup and may be employed for dynamic strain measurement applications,where only two wires are required to connect to the transducer.In this paper,the features of balanced constant current excitation are examined and compared against traditional techniques using the Wheatstone bridge or single-ended constant current excitation.A method to verify transducer health and cabling conditions is also presented.