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How Does an Optical Encoder Produce a Signal?

Posted by London Rhodes on Sep 29, 2021 1:52:06 PM

Optical encoders use a glass disk with a pattern of lines deposited on it, a metal or plastic disk with slots (in a rotary encoder), or a glass or metal strip (in a linear encoder). Light from an LED shines through the disk or strip onto one or more photodetectors, which produce the encoder’s output. An incremental encoder has one or more of these tracks, while an absolute encoder has as many tracks as it has output bits.

Topics: How to Choose An Encoder, Encoder Signals Output, Optical Encoders