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How Does an Optical Encoder Work?

From Fraba Inc.
 

 
The Optical Encoders typically consist of a rotating and a stationary member. The rotor is usually a metal, glass, or a plastic disc mounted on the encoder shaft. The disc has some kind of optical pattern, which is electronically decoded to generate position information. The rotor disc in absolute optical encoder uses opaque and transparent segments arranged in a gray-code pattern. The stator has corresponding pairs of LEDs and phototransistors arranged so that the LED light shines through the transparent sections of the rotor disc and received by phototransistors on the other side. After the electronic signals are amplified and converted, they are then available for the evaluation of the position. In some applications the encoder shaft makes one revolution for one complete cycle of machine operation (angular rotation of a crankshaft in a punch press or rotary indexing table). Absolute single-turn encoders can provide absolute position values over a 360° range. After one turn the measuring range is completed and it starts over again.
Products & Services
Absolute rotary encoders use optical, mechanical, or magnetic indexing for angular measurement. They do not lose their position after power-down, but instead provide absolute position upon power-up without requiring a home cycle or any shaft rotation. Search by Specification | Learn more about Absolute Rotary Encoders
Product Announcements
Gurley Precision Instruments - Virtual Absolute Technology
Gurley Precision Instruments has developed a unique encoding method that combines the simplicity of an incremental encoder with the reliability of an absolute encoder. (read more)
Gurley Precision Instruments - Low-Cost Model A37: Mini Rotary Absolute Encoder
The model A37 mini encoder is a 12-bit single-turn absolute rotary encoder with opto-electronic technology. These encoders are used in a wide variety of position-sensing applications for the measuring... (read more)
Gurley Precision Instruments - True Absolute Rotary Encoder
GPI improves the resolution of the A19 Low-Cost, True Absolute Rotary Encoder to 15 bits!... (read more)
Excitron Corporation - Optical encoder with index and 800 ppr for motors
Optical rotary encoder mounted on the rear shaft of the motor for our stepper motors. Resolution is 800 pulses per revolutuion with an absolute index that you can use to further automate your... (read more)
Automation and Metrology, Inc. - ECN 1313 By Heidenhain
ECN 1313 Rotary encoder with integral bearing for integration in motors Mounted stator coupling Installation diameter 65 mm Taper shaft... (read more)
Fraba Inc. - Absolute Magnetic Rotary encoder (MCD)
The compact design (36,5 mm diameter) of the new MAGNETOCODE (MCD) absolute encoders makes them suitable for applications with limited installation space and reduces material costs considerably. It is... (read more)
Topics of Interest
The purpose of an encoder is to act as a position feedback device as part of an integrated control system. The encoder is an electro-optomechanical device that attaches to a rotating shaft providing... (Read More)
Brushless Direct Current (BLDC) motors are gaining popularity and larger market acceptance. BLDC motors are used in industries such as Industrial Automation Equipments, Consumer, Medical, Automotive,... (Read More)
On every factory, and on every shop floor, something is rotating and someone wants to monitor it. Enter the optical rotary encoder. Encoders transform mechanical rotary motion into a sequence of... (Read More)
An incremental encoder simply generates pulses proportional to the position. The principle of the incremental measuring system is the scanning of a line pattern on a glass or plastic disc (see Image... (Read More)
In this study, finite element analysis was used to optimize the design of a stator coupling in order to increase its natural frequency. Through design iterations and analysis, it was discovered that... (Read More)
See more product announcements for Absolute Rotary Encoders
ECN 1313 By Heidenhain

ECN 1313 By Heidenhain
Automation and Metrology, Inc.


Rotary Encoders for Common Automation Applications

Rotary Encoders for Common Automation Applications
Heidenhain Corporation


Absolute Magnetic Rotary encoder (MCD)

Absolute Magnetic Rotary encoder (MCD)
Fraba Inc.


11 See more product announcements for Absolute Rotary Encoders