Data-matrix codes (DMC) are well known for part identification and traceability, but for measurement? Well that idea had me scratching my head, but according to “Data-matrix positioning systems” (MachineDesign.com, September 9th, 2010,) Pepperl & Fuchs have figured out a way to do just that.
As I understand it, the approach is to print a series of unique DMCs on a long, long strip. A camera is set up on a sliding carriage with a field of view sufficient to view six of the codes. Each code denotes a position and by interpolating between the codes the camera system can work out its location to a very high degree of accuracy.
Applications? Well I wonder about alongside railroad tracks or highways, or perhaps on very large machine tools. In fact anyway there are long travel distances this idea might have some mileage.
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2 comments:
positioning with barcode is old technology, I guess 2D code is just an extension. One example: https://www.mysick.com/saqqara/get.aspx?id=im0010453
Sorry, wrong link: http://www.leuze.com/products/log/bps01_en.html
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