Basler Camera in Car Headlamp Testing
The challenge was to build a stand-alone production and test machine for the automatic adjustment of car headlamps in order to achieve specific color rendition on the upper edge of the light cone. The tester is a fully automated machine with all necessary mechanics and electronics. A machine vision system performs mathematical evaluation of an image projected on a focusing screen. Based on this evaluation, the machine vision system controls stepper motors that adjust the diaphragm of the headlamp to meet the requirements. The machine is used to analyze the image on a projection screen lighted by a car headlamp and for adjusting the headlamp according to the results of the analysis. Several types of headlamps can be tested and/or adjusted. The machine is built from aluminum profiles and cast aluminum parts, and its mechanical concept is open so that other types of headlamps can be tested in the future. The implemented software, which is based on National Instruments LabVIEW(tm) with the NI Vision Development Module, controls both the machine vision task via a Basler scout camera and the mechanics and electronics of the machine. The PC also serves as an operator console.