摘要
在引入电感传感器等效电路的基础上,推导了非理想载波和非理想电感条件下,电感式测微仪幅位移与相位移公式,仿真计算给出了相应的数值曲线。针对传统电感处理电路对输出信号近似处理的缺点,提出用同步A/D与椭圆拟合算法同时提取输出信号幅值与相位的方法。根据幅位移与相位移的特点,在实验基础上提出在电感零点附近采用相位移法识别位移,远离零点位置用幅位移法识别位移的方案。实验证明该方法在不换档或改变放大倍数的情况下,不仅极大地提高了测量精度,同时使测量范围覆盖了传感器的整个线性范围。
The equivalent circuit of inductance sensor is analyzed. Amplitude-displacement and phasedisplacement equations are deduced for non-ideal carrier wave and inductance parameters. Simulation computation shows the corresponding digital curves. Considering that traditional process method is an approximate, a new one is presented to get the amplitude and phase of output signal of sensor simultaneously by simultaneity A/D and ellipse fit arithmetic. According to the characteristics of the amplitude-displacement and phase-displacement curves, the displacements is obtained by phase and amplitude for displacements respectively when sensor is near zero positions and in other positions on basis of experiment. Experiment showed this method can improve precision and range of measurement even if we have no range change.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2005年第12期1248-1252,1285,共6页
Chinese Journal of Scientific Instrument
基金
博士点基金(20020487039)
三峡大学重大科技项目(2003C05)
关键词
电感测微仪
相位移曲线
椭圆拟合
同步A/D
Inductance sensor Phase-displacement curve Ellipse fit Simultaneity A/D
