A scanner might be used onsite. A travelling case is convenient for its transportation. A scanning place should be warm, non-dusty, without direct sunlight or other illumination and with the stable 220 V supply.
Of course, scanning time depends on an object itself. If scanning simple objects on the turning table, it is possible to achieve the effectiveness of 1 object in 5 min. A car is being scanned in a full-time working day. Scanned data processing: reconstruction of a unified STL surface, hole covering and other operations take additional time.
A person, who operates a scanner, very often himself processes obtained data as well. In this case the user acts effectively: he/ she neither scans needless material nor omits required sections. Thus, it is better, if a 3d scanner operator either has experience of working with programs of processing scanned data / CAD packages or he/she is easily trained.
A scan area is the space area, which is seen by a scanner. If a scan area is changed, it is necessary to change cameras’ positions, to use a calibration field and lenses that correspond to a selected area. A scan area should be chosen so that an object would fit well in it. Very big objects are being scanned in a maximal scan area by portions.
A scanner generates many triangles. For the standard model with 1.3 MP cameras it can be obtained of up to 2.6 million triangles in one fragment. If 20 such fragments are processed, a big quantity of data is being obtained. However after reconstructing a unified STL data surface, data quantity decreases due to removal of overlapped sections. By means of the simplification function it is possible to decrease a triangle quantity even more and, as a rule of fact, to obtain their any quantity.
Matting is necessary for very glaring, transparent or black objects. As examples of such objects might be a steel spoon, glasses, and a black monitor body. Matting is being done by a thin layer of titanium oxide from an aerosol can. The formed coating looks like flour or talc. It is easily removed from smooth surfaces by a wet napkin. It is being removed from slots and small pores more difficultly. In such case an ultrasonic pan might be used.
A photogrammetric system is used to scan big objects by portions through application of markers. In this case marker coordinates are measured by the photogrammetric system with high precision. This practically eliminates errors of matching separate sections of 3-d scanning.
Operating system: Windows XP SP2, Windows 7 and 8 - 32bit, 64bit.
Processor: no weaker than Intel Pentium Dual Core 2 GHz
Video controller: NVidia is preferred; a controller shall have an output for 2-nd monitor
Ram memory: not less than 2 GB
Other: 3 free USB-ports
Our scanner is designed to scan immovable objects. Any move during scanning, which takes several seconds, distorts 3d data. This makes the process of scanning humans complicated and scanning animals impossible.
Main purpose of our 3d scanner is reverse engineering. It is not a tool to control precision. There are no metrological certificates for it. We calibrate scanner accuracy under conditions of an office with observing a methodology of calibration and scanning. Calibration errors don’t exceed the declared ones, but there are many factors that might affect scan accuracy at customer’s site (see details in the article “3D scanning accuracy”). Therefore, our scanner might be used as a device of auxiliary measurement, when main controlled points have been checked by such certified instruments as CMMs.
Markers are ordinary disks printed on adhesive paper. They might be produced even at home: just print the file with marker images on a home printer and cut the page in strips. Each strip after removal of a protecting film is being torn manually in separate markers that are being attached to an object.
Our scanner can scan objects of sizes approximately between 10 – 10000 mm. Depending on object size, a scanner is being adjusted to one of scan areas. The objects, which can’t get into a scan area, are being scanned by portions. A photogrammetric system should be used for objects of dimensions above 1500 mm.