Slide #1.

Incremental Encoders
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Slide #2.

Incremental Encoders • Encoders typically run on +5V, not +24V • Outputs are typ. not 24V compatible either
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Slide #3.

Absolute Encoders • doubling resolution requires adding another photodiode/LED pair • cost is much higher than incremental • does not require seeking to establish reference location
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Slide #4.

hybrid incr/absolute encoders • add more information to index channel to reduce amount of seeking required to find reference position. • interface requires lots of wires (parallel) or a special comm. protocol
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Slide #5.

Potentiometer • A potentiometer (or pot) is a variable resistor wired to obtain a variable DC voltage proportional to position
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Slide #6.

Magnetostrictive Pos. Sensor • Pulse sent down magnetostrictive material • Pulse reflects off position magnet’s field • Position is proportional to trcvd - tsent • Pulse propagates at ~2800 m/s • Resolution is ~.001” with tupdate ~1msec/in.
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Slide #7.

Magnetostrictive Sensor
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