bunu gönderme -...

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http://www.laserdesign.com/resources_and_downloads/faq/ t What is 3D Laser Scanning? 3D laser scanning / digitizing is a technology that captures the shape of physical objects digitally. Laser Design’s patented laser scanning technology will decrease your engineering costs, decrease time to market for your products, decrease material waste, and increase your product’s quality. Laser scanning an object is a lot like spray painting an object. The laser projects points or a line of laser light onto a surface as if “spray painting” the object. The density of points can be controlled, either denser or sparser, depending on the speed at which the laser travels over the surface, the same as with spray painting where the slower or longer you spray an area, the thicker (denser) the coverage of pigment. Unlike painting, however, laser points do not stack on top of each other; they are regulated to a specific density for very uniform coverage. And just like when you spray paint a part, the laser light needs to be directed towards the part so it covers all the surfaces that need to be captured. In order to make sure you don’t miss undercuts or otherwise blocked surfaces, you need to rotate the scanner to the specific area, such as inside holes. It is very difficult to spray paint into deep holes and the same is true of a laser scanner. It is unlikely to paint or scan the inside of a part if there is no access to it., however we can digitize hidden areas by casting a temporary splash or back-cast of the area and merge it with the prior scan data. t What are the Main Advantages of Laser Scanning?
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The primary advantages of laser scanning are: • It is non-contact; • It is extremely fast; • It is highly accurate; • It allows complete coverage of the part; • It is very repeatable; • Its Windows-based system makes it easy to use Non-contact scanning allows fragile parts to be measured and makes the coordinate locations especially useful to CAD/CAM systems where splining or surfacing through true surface coordinates is desirable. The laser's high resolution and thinner beam also permit scanning highly detailed objects where mechanical touch probes may be too large or inconsistent (non- repeatable) to accomplish the task. Once true surface coordinates have been collected for an object, a single set of data can be used to generate roughing and finishing tool paths for machining, feed CAD/CAM and analysis software, drive rapid prototyping equipment, and allow "electronic archiving" of physical objects. t How do Laser Design's Laser Scanning Systems Work? Laser Design's Surveyor family of 3D Laser Scanning Systems makes use of a laser sensor that is mounted to a 3 - 6 axis computer controlled positioning system or retrofitted to an existing CMM. We even have a portable model that sits on a camera tripod. An object that is to be scanned is placed on the bed of the digitizer and our Scan Control
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This note was uploaded on 11/24/2009 for the course MAK mak420 taught by Professor Tevfik denir during the Spring '09 term at University of Economics and Technology.

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bunu gönderme -...

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