The sensor OPTIPACT is based on an image correlation method. By comparing two different images the sensor tries to track suited structures within the images. Knowing the pixel size the sensor can calculate the movement in X- and Y-axis. Thereby OPTIPACT is the first sensor for length and velocity measurements in industrial applications capable of measuring in 2 orthogonal axes. To receive reliable measurement results a good structured surface is necessary. Trackable objects can be achieved by having a high-contrast image. This can be generated by a grazing illumination and a rough structured surface (e.g. like sand paper) or by a rough textured surface (e.g. like grained wood, grinded granite or paper with printed patterns). OPTIPACT-S1 is able to measure on these surfaces up to a velocity of 4m/s. Using optics with a higher resolution OPTIPACT can be adapted to less structured surfaces. The related version OPTIPACT-F1 has a velocity range of up to 1m/s. On glossy surfaces an angled mouting will also be helpful to be able to measure on it.