Optical absolute encoder！

Absolute encoder is the direct output of the digital sensor, in its circular code disc along the radial number of concentric code channel, each track by the light transmission and opaque sectors of the phase, the adjacent code channel fan The number of zones is a double relationship. The number of code channels on a code disc is the number of bits of its binary number. On one side of the code disc is a light source, and the other side has a light sensitive element for each code path. When the code disc is in a different position , The photosensitive element according to whether or not to convert the light level corresponding to the level signal to form a binary number. This encoder is characterized by not to counter, anywhere in the shaft can be read out a fixed position and the corresponding digital code. Obviously, the more code, the higher the resolution, for a binary resolution with N-bit encoder, the code must have N code channel.
Absolute encoders use natural binary or cyclic binary (Gray code) for photoelectric conversion. Absolute encoders differ from incremental encoders in that they are light-transmissive, opaque line patterns on discs. Absolute encoders can have a number of encodings that detect the absolute position based on the code read from the encoder. The design of the code can be used binary code, cyclic code, twos complement and so on

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