Components found in incremental encoders are also present in absolute Encoders. They incorporate a photodetector and LED light source, however an absolute encoder makes use of a disc with concentric circle patterns rather than one with uniformly spaced lines. In absolute encoders, the photo detector and the encoder disc are separated by a fixed mask. An absolute encoder outputs a signal in digital bits, each of which represents a distinct position. The light that the photodetector detects as the disc rotates creates the bit arrangement. The obtained light configuration is converted into grey code. Each slot thus has a distinct bit arrangement.
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