光栅信号自适应调理系统设计

2018-06-15

作者：於得奋，刘晓军，胡卓单位：华中科技大学

摘要：实际光栅干涉位移传感器输出正余弦信号由于光路、电路、环境误差的影响，存在非正交误差、不等幅误差和直流漂移误差，进而影响到位移传感器的计量精度。为了提高传感器的计量精度，本文设计了一种由微处理器、ADC、数字电位器及运算放大电路等构成的光栅信号自适应调理系统，采用硬件电路配合算法来实现光栅信号误差的实时调理。试验证明，该自适应调理系统对光栅信号误差具有较好的调理效果，能够显著改善信号质量，提高传感器的计量精度。

关键词：光栅信号；自适应；数字电位器；信号调理

中图分类号：TG806；TH741文献标志码：A

Design of Adaptive Modulation System for Grating Signal

Yu Defen，Liu Xiaojun，Hu ZhuoAbstract:

The actual grating interference displacement sensor’s cosine signal due to optical path，circuit，environmental error，there are nonorthogonal error，unequal amplitude error and DC drift error，and thus affect the displacement sensor measurement accuracy.In order to improve the measurement accuracy of the sensor，this paper designs a kind of grating signal adaptive conditioning system composed of microprocessor，ADC，digital potentiometer and operation amplifying circuit，which uses hardware circuit with the algorithm to achieve the raster signal error realtime conditioning.Experiments show that the adaptive conditioning system has a good conditioning effect on the grating signal error，which can improve the signal quality and improve the measurement accuracy of the sensor.

Keywords:grating signal；selfadaption；digital potentiometer；signal conditioning