Method for eliminating influence of vibration over measurement of incremental optical encoder
An optical encoder and incremental technology, which is applied in the direction of measuring devices, instruments, and conversion sensor output, etc., can solve the problems of poor shock resistance of incremental optical encoders, achieve great application value, expand the scope of use, and relax required effect
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[0032] On the basis of the existing incremental optical encoder, the present invention increases the number of photoelectric read heads of the optical encoder to four, and arranges the four photoelectric read heads evenly along the circumference of the indicating circular grating disk, so that each read head Distributed at 90 degrees relative to the center of the circle. The moiré fringe phase at the position of the four read heads is solved by four read heads, AD conversion circuit and phase detection algorithm, and then based on the phase information of the four specific positions, the vibration direction and the vibration direction of the scale circular grating disk are calculated Vibration amplitude, so as to obtain the error term caused by the vibration and reversely substitute it into the expression of the phase change of the moiré fringe caused by the rotation of the optical encoder, so as to eliminate the influence of the vibration.
[0033] The theoretical basis and e...
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