The sensor works by means of triangulation. For this purpose the sensor has a projection unit which projects a laser line onto the surface to be measured. This line is reflected and taken up again by a receiving element (PMD chip). Compared to the projection unit, however, the receiving element has a clear angular offset and can therefore detect the height profile.
The measuring range of the sensor is between 150 mm and 300 mm away from the sensor. Due to the perspective of the receiving element, the length of the laser line depends on the distance of the sensor to the target (the closer to the sensor, the shorter the line). Nevertheless, even if the distance between the sensor and the object changes, the proportions of the object remain the same. This means that the contour is measured independently of the distance. This makes the alignment and positioning of the sensor very simple.