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A Method for Determining the Interpolation Error of Grating Signals Without Length Reference

Wang Chunhai;Zhang Guoxiong; Jing Fangsheng (Tianjin University, Tianjin 300072)  
The relation between interpolation error and Lissajou's figure is analyzed for grating signals. It is found that the interpolation error can be evaluated by the roundness of Lissajou's figure. This technique is easily realized by voltage measurements instead of direct calibration which needs length reference of high accuracy. This method is applicable for grating signals with various kinds of errors, as well as other quadrature signals used for interpolation.
【CateGory Index】: TH741.6
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