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optical
An optical potentiometer does not have mechanically contacting parts to detect movement. An LED and a light sensor are used to sense the rotation of the shaft. The light beam generated by the LED passes through a slit that spins with the shaft; a light sensor then gauges the light passing through the slit to determine the movement of the shaft. The contactless mechanism has no wear or abrasion, which gives it long life and shock resistance characteristics.
PTM Published on: 2018-02-07