[Case Study] Comparison of Scanning Accuracy between 3D Laser Scanners and X-ray CT Devices

basic information

When comparing the dimensional results calculated from the data of a three-dimensional measuring machine, a 3D laser scanner, and an X-ray CT device, it was found that the measurements calculated from the scan data of the 3D laser scanner were closest to those of the three-dimensional measuring machine. Although the angle deviation was slightly larger, the length was generally within an error of ±0.01mm. The X-ray CT device produced overall worse results compared to the 3D laser scanner, but it did not exhibit significant distortion and can be considered to be at a satisfactory level for reverse engineering data. The 3D laser scanner, which yielded good results in this verification, struggles with glossy samples, internal shapes, recessed areas, and sharp corners. On the other hand, the X-ray CT device can simultaneously acquire shape data from both the exterior and interior, but in composite material samples like resin and metal, it may not accurately capture shape data due to noise interference. Thus, there is no universal method for acquiring shape data, and it is necessary to select the appropriate method based on the material and shape of the sample targeted for reverse engineering, the required precision, and how the data will be utilized.

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Applications/Examples of results

The equipment and software used are as follows: ■ 3D Laser Scanner (Nikon: MMDx50) ■ X-ray CT Scanner (Nikon: XT H 225 ST) ■ CNC Coordinate Measuring Machine (Mitutoyo: CRYSTA Apex S9168) ■ 3D Modeling Software for Reverse Engineering (3D Systems: Geomagic Design X) ■ 3D CAD Software (Dassault Systèmes: SOLIDWORKS)