OOTICAL ENCODERS ROTATIONAL POSITION！

Rotational position may be measured with potentiometers, coupled
to a rack and pinion assembly or gear trains to obtain a suitable ratio
of potentiometer revolutions to measured component rotation or
movement. (See Figure 9.05) Potentiometers commonly come in
single turn to as many as 25 turns and fit numerous applications.
But, most rotational measurements, whether they are velocity,
rpm, or position, are best handled with digital encoders. Like linear
encoders, several types have been used over the years including
both contacting (see Figure 9.06) and non-contacting. They contain
a disc (code wheel) or a plate made with alternating opaque and
transparent segments that move between a light source such as
an LED, and a photo-detector. (See Figure 9.07.)

hybrid encoder, non-magnetic encoder, multi-turn encoder, multi-turn combination encoder, draw wire encoder, digital readout, linear scale ,incremental encoder,absolute encoder.

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