Creaform has three main portable 3D scanners for collecting surface data information. There is the Go!SCAN, the HandySCAN, and the MetraSCAN. All three of these have different ways in which they figure out where they are in 3D space relevant to the geometry being scanned. Last time we looked at the Go!SCAN so this time we will take a dive into the HandySCAN.
The HandySCAN differs quite a bit from how the Go!SCAN works. Where the Go!SCAN uses a white light square projection the HandySCAN uses red laser lines projected out on the surface. There are two flavors for the HandySCAN, the 300 and the 700. The main differences between these is that the 300 projects out two sets of 3 laser lines that form a bunch of crosses in the middle and the 700 projects out 2 sets of, you guessed it, 7 laser lines that make even more cross sections. The HandySCAN 700 also has a bonus mode to project out just one laser line that is helpful for collecting data on a specific area or seeing farther down into holes. The laser lines make the below pattern.
With the fact that the HandySCAN is using thin red laser lines to capture the shape of the surface it can not track any geometry data because it will lose sight of it as soon as it passes out the side of the line thickness. Because of this, the HandySCAN must use the tracking target stickers to triangulate its position relative to the object being scanned. The scanner has little infrared lights on it that light up the Creaform tracking targets, so they are easily recognized. The lasers create a scan area that is 10.8in X 9.8in, that means you will need to have a minimum of 4 tracking targets visible within that area at all times. More targets are useful for being able to not loose reference between targets. It is recommended the space the targets about 4 inches apart.
Also, if the part is too small to be able to add the targets directly to it you can put them on around the part for reference, just don’t move the part in respect to the targets during scanning with the setup.
Once you have your part covered in targets you can start scanning. The best practice is to use the Spider-web technique. To do this start the scan in the center of the part and scan out to one side, then move back to the middle of the part and go out to another side from there. This limits the amount of scan distance stack up that can artificially make your tolerance worse.
The final point is that you can add or remove targets from the part as needed, even after you have started scanning and it will not cause any issues. So if you find a section of the part where the scanner is loosing track of its position because there are not enough targets, you can just pause the scan, add a few more target stickers, and resume the scan where you left off.
Applications Engineer, 3D Printing and 3D Scanning
Computer Aided Technology, LLC