Error dispersion algorithms to improve angle precision for an encoder
Yuji Matsuzoe · Optical Engineering · 2002
We apply interference fringe scanning algorithms that are used in interference fringe analysis to an optical encoder as angle detection algorithms to disperse the influence of sinusoid wave distortion from the encoder's photodetector. We also evaluate these algorithms using the analytical system and techniques employed to obtain the same output signal as that of the actual encoder. This is accomplished using light intensity image data produced as the light permeates the slit disk of the encoder. As a result, we obtain about twice the angle precision by applying these algorithms to the optical encoder.