Absolute encoder disk！

As opposed to the simple, single track
system of an incremental encoder, an
absolute encoder disk features several
concentric tracks, each consisting of a
pattern of transparent and opaque
segments. These independent tracks
provide a unique combination of
absolute values for each position. The

word track sensors to plus or minus
one count. In all other codes, such as
Binary or Binary Coded Decimal
(BCD), several bits are required to
change state between adjacent words.

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