Automatic vehicle headlamp light distribution testing and video system - has microcomputer-controlled signal analyser and calibration lamp arrangement

摘要

The system for the automatic measurement of the light distribution of a suspended moving vehicle headlamp uses a measurement video camera system for rapid accurate testing. The photometric measurement data are stored digitally for evaluation and documentation. The light-to-dark transition region is also evaluated. A microcomputer (4) controlled video signal analyser (5) locates the light maximum and the light-to-dark transition regions w.r.t two calibration lamps (13) arranged in a reflecting projection wall (12). The positions are transferred to a monitor (2). A controller (22) positions the headlamp (23) in defined measurement orientations by swivelling. Several individual measurement point photoelements (15) in the projection wall are associated with photoelectric boundary values. For light-to-dark transition region evaluation the lines of the video system are perpendicular to the transition boundary zones.