Optical rotary absolute encoder ！

Unlike an incremental encoder, an absolute encoder does not generate output as pulses but as digital words that identify its position encoders as a static reference point within an absolute coordinate system. As a result, even in the event of power outage, an absolute encoder maintains record of its absolute position. Upon restart, the system can resume motion immediately, without rehoming.

An absolute rotary encoder features a code disc attached to the shaft and fixed mask that allows the system to essentially create a unique binary identifier for each point of travel (linear versions operate analogously,  but for the sake of simplicity, we’ll focus on rotary encoder versions here). As the code disc rotates atop the fixed mask, the system periodically reads out the identifier, outputting it as a multi-bit digital word. The associated controller or drive polls the encoder to capture position data that it can use directly or process into velocity information. 

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