QI Yong-yue, ZHAO Mei-rong, LIN Yu-chi. High accuracy system of laser interferometer fringe division[J]. 2006, (8): 43-45+48. DOI: 10.13873/j.1000-97872006.08.015.
高精度激光干涉条纹细分系统
摘要
在激光干涉测量中
通常以相位差为90°的两路信号进行辨向计数和细分
而在这两路信号中普遍存在着非正交误差、不等幅误差和直流电平漂移误差
这些误差的存在严重地影响了测量结果的精度。因此
设计了以C8051F单片机为核心的电路补偿模块
采用以Heydem ann模型为基础的误差修正方法
对以上3种误差进行了动态补偿
进而实现了纳米级精度的位移测量。
Abstract
Usually a couple of quadrature signals are used to discerning direction count and subdivision in laser interferometry system.There are quadrature phase shift error
unequal amplitude error and zero offsets error in the two quadraturt signals.The measuring accuracy is influenced by the three errors.Taking microchip computer C8051F as the core of a compensation mode
the three errors are compensated by Heydemann model.Nano degree of accuracy result displacement measurement is realized.