Practical guide to automated metrology 3D scanning with GOM solutions

GOM is a world-known manufacturer of 3D optical scanners, metrology systems, and non-destructive testing solutions. The company produces professional grade equipment of incredible accuracy, used in industry, automotive, aerospace and other industries. Here is a practical guide to automated metrology 3D scanning with GOM solutions.

The capabilities of today’s 3D printers and machining centers are limitless. But work on a part always starts with a 3D model, and engineers have two options for getting the part they want from a blank piece or to print it: develop a model from scratch in 3D modeling software, or take advantage of 3D scanning and get a model of something that already exists so they can edit it and use it.

The purpose of 3D scanners

3D scanners allow you to get a three-dimensional model of an object.  Scanning is often the most convenient and fastest way to get a model, and sometimes it is the only way possible. For example, there is no more reliable way to make a model of any work of art, and if you need a more massive and in-demand example in real life, 3D scanning is used to automate finding defects and controlling the dimensions of parts in the automotive and aviation industries.

Photogrammetry

This method allows us to build models of objects based on a set of photos taken from different angles. The more photos, the more detailed the model. This method is based on a mathematical algorithm, which calculates the position of points in space by estimating their relative position depending on brightness and depth of field in different photos. The best results can be achieved with cameras with fixed focus and if the distance to the object is equal, when the photographer moves in a circle.

It is used extensively in defectoscopy because it provides data on the presence and structure of even the smallest pores, which is important in the production of highly stressed structural elements or complex castings such as the cylinder head of an engine. There are several variations of this method. Triangulation laser scanners measure the displacement of a reflected beam that has passed through a special lens, while time-of-flight laser scanners construct the topography of a scanned part based on changes in the return delay of the reflected laser pulse. Its distortion on the object, which is read by a special camera, allows you to get a very precise idea of its shape.

Laser scanning

This is a slower but in some cases more accurate way to get information about an object. It is used extensively in defectoscopy because it gives information about the presence and structure of even the smallest pores which is important in the production of heavily loaded structural elements or complex castings such as the cylinder head of an engine. There are several variations of this method. 

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