An encoder is a device that translates mechanical motion into electronic signal used for position feedback.
Encoder can be categorized in to Absolute Encoder and Incremental Encoder
Absolute Encoder -
Absolute encoder provides specific location information.
Incremental encoder provides distance traveled and direction information.
How encoder works?
Optical incremental encoders are the most commonly used encoder.A disc or grating moves between a light source and a detector. When light passes through the transparent areas of the grating and mask an output is seen from the detector.
This output signal can be sinusoidal or square wave.
Applications of Encoders
Ball screw positioning