How can the disc angle rotation be measured? ！

With this encoder, the displacement is obtained by counting the number of times that transitions occur between logical values "0" and "1". This allows the transformation of physical quantities by converting the angular displacement variations into electrical type signal output that is translated into logical values by suitable electronics. The counting of the number of transitions that occur in the (reflective / opaque and nonreflective / transparent) disc sectors is related to the concept of resolution.

The resolution may be defined as the smallest change in a quantity under measurement that causes a noticeable change in the corresponding outcome. In this case, the resolution of the disc corresponds to its minimum angular encodervariation that causes a transition at the logical output level. As there are nine 0 to 1 transitions in a complete rotation of the disk in Figure 3, its resolution is: 360° / 9 = 40°. So the 40° value matches the period of the blue wave shown in Figure 4.

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