T-SCAN: Measuring Principle


A visible laser beam (670 nm, laser class 2), which is linearily orientated by a polygon mirror, captures the surface of the object to be measured with high scanning frequency. Using the triangulation principle, the measurement distance is calculated from the position on the object surface where the incident laserlight is reflected back to the receiving optics. The exact spatial position of the scanner in all 6 degrees of freedom (6D: three spatial coordinates and three tilting angles) is determined by an optical tracking system which identifies at least three of the 29 infrared markers that are positioned on the scanner.

By moving the scanner, the object surface is completely captured. The measured 3D coordinates are displayed on the monitor in real-time. A pilotbeam and LED´s on the back side of the scanner are used to guarantee the optimum distance during the scanner movement over the object surface.