Linear transducers！

Most modern potentiometers are extremely linear
and are made with special alloys or precious metal
wipers and conductive plastic resistive elements to
withstand as many as 100 million revolutions. They
are usually part of a voltage divider and provide an
output voltage proportional to displacement, but they
may also drive analog-to-digital converters to feed
microprocessor-based instruments directly. However,
when digital outputs are needed, a more common
practice uses digital encoders that inherently supply
higher accuracy.

absolute encoder, incremental encoder,

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