Abstract：Based on the principle of grating pair modulation, a method of self-adaptive filtering in the light of incremental optical electrical encoder subdivision based on the models establishment of physical optics and geometrical optics is described.It also analyzed the reason why the photoelectric signals output for Moiré fringe are uncertain,remaining the original baseband signals by self-adaptive filtering high frequency signals.The result of self-adaptive filtering is equivalent to a narrowband band pass filter whose center frequency is original baseband and the pass band will change accordingly the original baseband with random variation.Experiments showed that application of this self-adaptive filtering technology can filter all the high frequency in the main count signal except original baseband so that the output waveform of Moiré fringe photoelectric signals are close to the standard sine wave and the signal distortion is reduced by a factor of 8.
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2012, Vol. 33 
