The Understanding of Photoelectric Velocity Disc！

Photoelectric speed encoder or optical speed sensor, it is used to measure the speed of the device. It is divided into single output and dual output two. Single output refers to the rotary encoder output is a set of pulses, and dual output rotary encoder output two 90-degree phase difference of the pulse, not only by these two pulses can measure the speed, you can also determine the direction of rotation

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