The System The measurement principle is triangulation: A laser light line is projected onto a surface and viewed from a direction different to the direction of projection. A variation of surface distance causes a shift of the imaged line at the detector. This means the sensor is scanning the surface profile. This profile clearly indicates the seam geometry or joint position. By incorporating the newest imaging technology we unleashed the power of this robust measuring principle. Electronic imagers with a high dynamic range and readout speed allow the precise evaluation of profiles at varying surface conditions with rates of 200 to over 3000 profiles per second. To generate the processing power for such high image rates a set of highly integrated Gate Arrays has been developed. In combination with industrial PCs an effective and powerful sensor system with interfaces to CNCs, PLCs, robot controllers and plant information systems is available.