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Dr. Schenk Laser Galvo Optical Components Siemens A&D RSF Linear Encoder |  |
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US $199.99 | 28d 11h 20m |
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Optical Encoder
What is an Optical Encoder?
I have this device from US Digital on it that was left in my store and i was wondering what it does.
An optical encoder measures how far something has moved, optically. It does this by looking at a pattern of alternating black-and-white, and counting number of transitions.
Optical encoders come in two varieties: regular and quadrature phase. A regular encoder uses a simple pattern of black-white. It can count number of transitions, but cannot tell the direction of motion
In contrast, quadrature phase uses two staggered patterns, so that the system can tell which way the thing is turning. This can either be done explicitly with two patterns, or implicitly by using one pattern, but appropriately spaced sensors.
In addition, optical encoders can use one of two types of sensors: reflective and break-beam. Break-beam tend to be more accurate, but require precise mechanical alignment, sometimes hard to achieve in hobbyist projects:
In contrast, a reflective sensor just consists of an LED next to a matched photosensor (photodiode or phototransistor).
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Dr. Schenk Laser Galvo Optical Components Siemens A&D RSF Linear Encoder | |
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US $199.99 | 28d 11h 20m |
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DIY DC Motor with Optical Encoder
the code used to reduce the error due to ambiguity in reading of a binary optical encoder ____ code?
Gray code,...
REf..
http://www.patentstorm.us/patents/6005727-description.html
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