自平衡电桥激励的压力传感器零点输出信号的电漂移特性

本文详细的分析了自平衡电桥激励的压力传感器的输出信号U与桥电压V_e、供电电压V cc及流体压力P之间的关系,并指出,不仅对桥电压而且对总激励电压都存在零点电漂移.在U~V_cc、P的三维空间表达了三者之间典型关系曲线.在U₀|_Vcc0=0的等势面(V_cc0)上显示出高的压力灵敏度,而在U₀/U_cc=0的等势面(≈ 1 2 V_cc0)上,压力灵敏度则低的多.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 Property of Electric Drift of Null Point Output for the Pressure Sensors Excited by a Self- balanced Bridge

The relationship among output signal U,bridge voltage V_e,supply voltage V_cc,fluid pressure P for pressure sensors,which are excited by a self-balanced bridge,is discussed in detail.It is pointed out that electric drift of null point output is always existed not only for the bridge voltage but also for the supply voltage to the whole circuits.The typical curves among them are expressed in the 3D space of U-V_cc-P.A high sensitivity is displayed in Vcc0 equipotential plane,for which U0=0 but much lower sensitivity in the equipotential plane (≈(1/2)V_cc0),for which U₀/V_cc=0.It is suggested that electric drift of the null-point output should be taken as one of specifications for pressure sensors.