3d laser scanning is a technology which enables us to capture the actual shape and size of physical objects by creating “point clouds” of data from the surface of the object. This point is used to reconstruct the shape of the object. It is a technology which came in to practical applications since 1998. This technology is now being used as the Standard way to make accurate measurements. The main advantage of it is that the measurement will be very accurate even in tough environmental conditions.
A device which is used for 3d scanning is known as a 3d scanner, it is similar to a camera, and the difference is that the camera captures the image in its field of view while the 3d scanner captures the distance information about the surface in its field of view. The image produced by the scanner can be used to predict the distance to a surface from each point in the picture.
s can be divided in to two, contact and non-contact scanners. As the name suggests the contact scanners requires physical contact with the object to be scanned while the non-contact doesn’t.
Laser scanning works in different steps, first the scanner needs to be placed above the object which is to be scanned, while the laser probe scans the object sensor cameras continuously record the changing distance and shape of the laser line in three dimensions (XYZ) as it sweeps along the object until the image appears in the “point clouds” completely.
After that the huge” point cloud” data files are created, they are registered and merged into one three-dimensional representation of the object and post-processed with various software packages suitable for a specific application. If the data is to be used for inspection, the scanned object can be compared to the designer’s CAD nominal data.
The result of this comparison process is delivered in the form of a “color map deviation report,” in PDF format, which pictorially describes the differences between the scan data and the CAD data. Laser scanning is the fastest, most accurate, and automated way to acquire 3D digital data for reverse engineering.
Again, using specialized software, the point cloud data is used to create a 3D CAD model of the part’s geometry. The CAD model enables the precise reproduction of the scanned object, or the object can be modified in the CAD model to correct imperfections.
GKS can provide a surface model or the more complex solid model, whichever results are needed for the application.
One of the main advantages of it is that 3D laser scanners measure fine details and capture free-form shapes to quickly generate highly accurate point clouds.
3D laser scanning is ideally suited to the measurement and inspection of contoured surfaces and complex geometries which require massive amounts of data for their accurate description and where doing this is impractical with the use of traditional measurement methods or a touch probe
Some of its main uses are
- Hazard surveying
- Change Detection
- Structural As-built