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1874年 L.雷莱第一次描述二个光栅重叠产生的干涉条纹以来,用条纹移动进行测量有过许多偿试。在与第一个条纹相距1/4条纹间距处增加了第二个接收通道,并通过适当的信号处理电
Since L. Leile first described the interference fringes created by the overlapping of two gratings in 1874, there have been many attempts to measure with fringe movement. A second receive channel is added at a quarter stripe distance from the first stripe and with the appropriate signal processing power