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The Absolute Encoder is a sensor that directly outputs digital quantities. There are several concentric code tracks along the radial direction on its circular code disc. Each track is composed of light-transmissive and opaque sectors. The fans of adjacent code channels The number of zones is a double relationship. The number of code channels on the code wheel is the number of binary digits. On one side of the code wheel is the light source, and the other side has a photosensitive element corresponding to each code channel; when the code wheel is in different positions When, each photosensitive element converts a corresponding level signal according to whether it receives light or not, and forms a binary number.