Electronic Interpolation Errors
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High-precision and resolution motion control relies critically on the precision and resolution of positional measurements achievable from the encoders. These factors are in turn limited by the technology behind the manufacturing of encoders. To date, the scale grating on linear optical encoders can be manufactured to less than 4 μm in pitch, but clearly, further reduction in pitch is greatly constrained by physical considerations in the manufacturing processes. This implies an optical resolution of 1 μm is currently achievable after a fourfold interpolation. Analog interpolation using soft techniques will provide an interesting possibility to improve further on the encoder resolution, by processing the analog encoder signals online to yield the small intermediate positions.
KeywordsInterpolation Method Sinusoidal Signal Interpolation Error Binary Pulse Servo Controller
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