Measuring systems
Bridge between 3D shape capture and dimensional accuracy testing
Isra Vision is showing a sensor that combines triangulation, stereometry and phase-shifting fringe projection, thus bridging the gap between 3D shape detection and dimensional accuracy inspection.
Thanks to its stereometric design with two cameras, the sensor uses triangulation to map the surface properties of the test object in three dimensions. Depending on the setting, it uses a striped or random pattern for illumination. With fringe projection, a temporal sequence of parallel line patterns with different brightness values is projected onto the object. The cameras record the images of the modulated brightness distributions at the known angle of view (triangulation angle) and pass them on to an algorithm that can calculate the object coordinates from them. By projecting the fringe pattern via a micromirror array, the line patterns can be adapted and executed at high projection speed, according to the manufacturer. By using a sinusoidal pattern for the phase shift, the sensor also only requires around two thirds of the image recordings that would otherwise be necessary when using a conventional gray code pattern. An LED with high luminosity ensures that sufficient light is returned to the cameras.
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