[Case Study] Comparison of Scanning Accuracy between 3D Laser Scanners and X-ray CT Devices
I will introduce a comparison of the scanning accuracy between 3D laser scanners and X-ray CT devices.
When performing reverse engineering, it is necessary to obtain point cloud data of the sample's shape, and the major methods for data acquisition are 3D laser scanning and X-ray CT scanning. Each method has its advantages and disadvantages, but which scanning method offers better accuracy (i.e., higher shape reproducibility)? In this case, we will verify the extent of error and distortion in the scan data from the 3D laser scanner and the X-ray CT scanner based on the dimensions measured by a three-dimensional measuring machine. The procedure is as follows: 【Step 1】 Obtain point cloud data of the sample's shape using a 3D laser scanner. 【Step 2】 Obtain point cloud data of the sample's shape using an X-ray CT scanner. 【Step 3】 Conduct dimensional measurements using a three-dimensional measuring machine. 【Step 4】 Extract dimensional data from the point cloud data in Steps 1 and 2, and compare it with the dimensional data from Step 3.
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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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※The delivery date may vary depending on the content and quantity, so please feel free to contact us.
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)
Company information
To support the digitalization of the development and manufacturing processes in manufacturing, we provide a one-stop service for a series of technical services from "reverse engineering" to "prototyping and processing" to "evaluation and experimentation." To implement new processing technologies and production techniques such as 3D scanning, reverse engineering, 3D printing, and resin molding in actual sites, extensive verification and evaluation are required. By outsourcing these processes to us, we believe it will lead to a more effective use of your management resources. Please take advantage of our technical support services for the development, design, prototyping, and evaluation processes in manufacturing, built on the expertise we have cultivated over 20 years of supporting manufacturing development and contract evaluation services.
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