Rotary Encoder Incremental Encoder Sensor
Rotary encoder is the sensor which could convert the shaft mechanical displacement to digital or pulse signals. On the incremental encoder disc， there are many square holes equally spaced. The rotary encoder could output the pulse signal through the electrical part reading the holes on disc.
Encoder Incremental Optical Sensor
Encoder can be divided into absolute encoder and incremental encoder. Incremental encoder is relatively easier in realizing its function than absolute encoder. Its cost is lower than absolute encoder. The measuring range of incremental optical encoder is one turn(360 degree). After 360 degree, it will start from 0 again. Optical sensor has higher accuracy than magnetic encoder. The optical glass can provide the accurate position feedback.