PowerPoint Presentation

ENCODERS

PRESENTED BY :Manpreet Singh (1238838)Mehak Ashwani (1238840)Ravinder Singh (1238868)What is an encoder?Anencoderis a sensor of mechanical motion that generates digital signals in response to motion. As an electro-mechanical device, an encoder is able to provide motion control system users with information concerning position, velocity and direction. There are two different types of encoders: linear androtary. A linear encoder responds to motion along a path, while a rotary encoder responds to rotational motion. An encoder is generally categorized by the means of its output. An incremental encoder generates a train of pulses which can be used to determine position and speed. An absolute encoder generates unique bit configurations to track positions directly.Block Diagram for Encoders

Types of Encoders:Incremental linear encoderIncremental rotary encoderAbsolute linear encoderAbsolute rotary encoderIncremental Linear EncoderThis encoder has a transparent scale with an optical grating. The thickness of the grating lines and the gap between them is made equal ,which is in the range of microns. On one side the scale is provided with a light source and condenser lens. On the other side there are light sensitive cells. The resistance of the cells decreases whenever a beam of light falls on them. Thus a pulse is generated each time a beam of light falls on them. Thus a pulse each time a beam of light is intersected by the opaque line. This pulse is fed to the controller, which updates a counter. Incremental rotary encoders are not as accurate as absolute rotary encoders due to the possibility of interference or a misread.

Linear encoder