提高测量灵敏度及改善非平衡电桥测量线性的一种有效方法的理论分析

A Theoretical Analysis of an Effective Method of Improving the Sensitivity and the Linearity in Measurement with Unbalanced Bridge

在智能测量仪器和测量技术中,多采用非平衡电桥作为前置电路.但非平衡电桥输出是非线性的,且对微弱变化的物理量进行观测也要求线路具有较高的测量灵敏率,“运放”的应用和分段测量法为解决以上问题提供了一条切实可行的有效途径.

In intellingent instrumentation and techniques for measurement,an unbalanced bridge isused for preconditioning circuit in most cases.But the output of unbalanced bridge is nonlin-ear and its sensitivity might not be enough for measuring very small changes of physicalquantity.The application of operational amplifier and segmental measurement technique hasprovided a feasible and effective approach to the solution of the above-mentioned problems.