How many types of encoders? What is the difference?！

How many types of encoders? What is the difference?

Photoelectric encoder stars incremental encoder and absolute encoder. Incremental divided into rotary and linear encoders.
Incremental and absolute right to say:
Incremental and absolute encoders as their names known, the absolute encoder to the absolute position and incremental encoders is relative positions. Therefore, the incremental encoder every use homing operation must be carried out to find the reference position.
Rotary and linear;
They have different structures, the rotary encoder is a reference grating scale homogeneous glass disk, and the glass rod is linear. Rotary generated between the scanning grating differ from each other by 90 degrees to 90 degrees four sinusoidal current, do these four current signal processing, and finally produce a voltage signal by 90 degrees; and linear encoder is its grating alternating projection or reflection and the relative movement between the reading head generates light by 90 degrees to produce a pulse voltage.

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