Optical Absolute Encoder.！

Absolute encoders have the position corresponding to the output code, usually binary or gray code. From the change of code size can distinguish positive and negative directions and the location of displacement, absolute zero-bit code can also be used to power position memory. Absolute encoders conventional measuring range of 0-360 degrees.
Incremental rotary encoder

Each ring shaft rotation, incremental encoders provide a certain number of pulses. Measured periodically or the pulses per unit time can be used to measure the speed of movement. If it is accumulated in a reference point behind the number of pulses, the calculated value represents the angle of rotation or stroke parameters. 90º phase difference between two-channel encoder output pulses. Rotation sensing signal to make the received pulse of the electronic device receiving the shaft, and therefore can be used to achieve bi-directional positioning control; In addition, the three-channel incremental rotary encoder pulse per revolution is called a zero signal.

Incremental Absolute rotary encoder absolute encoder position of each axis to provide a unique value for the digital encoding. Especially in position control applications, the absolute encoder reduces the computational tasks receiving electronic device, thereby eliminating the need for complicated and expensive input device: And when the machine on the power after a power failure or power, not need to return to the position of the reference point, you can use the current value of the position.

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