Absolute encoder principle of opreation！

In principle, absolute encoders are
similar to incremental encoders, in that
a rotating disk interrupts a
photodetector to produce an output
signal.
However, absolute encoders are
different in two very important ways:
1. Every position of an absolute
encoder is unique. Unlike an
incremental encoder, where position
is determined by counting pulses
from a zero mark or home base, the
absolute encoder reads a system of
coded tracks to establish position
information. No two positions are
alike.
2. Absolute encoders do not lose
position when power is removed.
Since each position encoder is unique, true
position verification is available as
soon as power is up. It is not
necessary to initialize the system by
returning to home base.

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