Its compact and light design facilitates transport and use during the measurement processes.
The 3D data acquisition process is carried out by using the technique called structured white light triangulation. A series of black and white luminous stripes are projected on the component surface. The 3D information is obtained by analysing the deformation the projected lines suffer when they reflect on the object surface. Two cameras integrated in the measurement probe capture the images in which the component and the deformation of the luminous stripes can be observed. This projection and image acquisition process is carried out in a few seconds. With these images we obtain a 3D point cloud of the object’s surface.
In order to obtain the complete geometry of a component, it is usually necessary to take measurements from different angles and positions. All measurements must be referenced to a global coordinate system. This is called the capture process. In addition to having the necessary tools for the 3D visualisation of the digitalised results in real-time, STT’s scanner allows for the use of different capture strategies that are distributed in different modules.
- Automatic transformation of the coordinate system based on geometric elements and ‘best-fit’ algorithms.
- Automatic capture of the different angles based on geometric elements.
- Automatic capture through the projection of marks.
The results can be exported in different formats (OBJ, STL, custom ASCII files) and are totally compatible with other point cloud treatment software.
In its basic configuration the software includes the capture by means of geometric marks. The user must stick a number of adhesive circular or spherical marks that are used as a reference on the component. With this capture strategy you can automatically digitalise components of a size similar to the measurement volume used.
Adhesive circular marks are placed on the component to be measured and are used as references. The photogrammetry system measures the centres of the circles with great precision up to 15 µm/m. During the measurement process the system is capable of recognising the same centres and automatically positioning the point clouds acquired with respect to them with great precision. You thus have a measurement system capable of completely digitalising large objects, such as a car for example, with a high density of points and an error of less than 0.15mm.
Finally, there can be some situations where structured light scanners are not the best solution. For example, small places or where access space is limited. For those situations, STT offers high-precision laser scanners adapted to the specific need of each project.