外加电压和桥电压对压力传感器零点和灵敏度影响理论分析  

Theoretical Analysis for Influence of the Applied and Bridge Voltage on Null Point and Sensitivity for Pressure Sensors

作　　者：孙以材[1] 范兆书[1] 范志新[2] 

机构地区：[1]河北工业大学电气信息学院,天津300130 [2]河北工业大学文理学院,天津300130

出　　处：《河北工业大学学报》2001年第2期6-11,共6页Journal of Hebei University of Technology

基　　金：国家自然科学基金资助项目!(69672015)

摘　　要：分析了自平衡电桥激励的压力传感器的输出信号U 与桥电Ve 、供电电压 Vcc 及流体压力P 之间的关系，并指出，不仅桥电压而且总激励电压都对零点和灵敏度有影响．在U ~Vcc 、P 的三维空间表达了三者之间典型关系曲线．在零点电压为零的等势面（Vcco）上显示出高的压力灵敏度，而在Vo^Vcc 关系曲线的极小值所在等势面上，压力灵敏度则低得多．建议零点输出的电漂移应作为压力传感器的一个特性指标．：The relationship among output signal , bridge voltage , supp ly voltage , fluid pressure for pressure sensors, which are excited b y a self-balanced bridge, is discussed in detail. It is pointed out th at not only the bridge voltage but also the supply voltage have influe nce on null point and sensitivity for pressure sensors. The typical cu rves among them are expressed in the 3D space of --. A high sensitivit y is displayed in equipotential plane, for which = 0 but much lower sensitivity in the equipotential plane,where the minimum poine for ~ curve is located.It is suggested that electric drift of the mull-poi nt output should be taken as one of specifications for pressure sensor s.

关 键 词：零点输出 电漂移 压力传感器 自平衡电桥 非线性电阻器 灵敏度 桥电压 外加电压 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TH812.5[自动化与计算机技术—控制科学与工程]