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Optimet scanners’ sensor use a technique called "Conoscopic Holography" to measure the distance between the sensor and the object being scanned. As opposed to other methods of 3D measurement, Conoscopic Holography allows the laser light to return in the same direction that it was transmitted in. In other words, the light paths are collinear. This means narrow holes, steep angles and other difficult shapes can be measured without a problem.
How it Works
Conoscopic holography exploits a particular type of light interference based on crystal optics. When the light from the laser reflects off the measured object, the sensor recollects this light, polarizes it and puts it through a conoscopic crystal. The output from the crystal forms a diffraction pattern (see below). The frequency of the pattern’s fringes depends solely on the distance between the measured object and the sensor. Thus, one can measure this frequency to reduce the distance of a point on the object.
The best way to scan impressions!
Tooth example:Height 8.41mm, top diameter 4.55mm, bottom diameter 3.35mm, missing scan data can be seen on the lowers walls of the triangulation scan. For incisor shape scans data will be lost from side and bottom walls.