SCREEN PHOTOMETRY

Goniophotometry allows the measurement of high contrast distributions like headlamp low beam, rear lamps or other high dynamic distributions and has a very slow mismatch factor. But the measurement is slow and takes minutes up to hours for a complete distribution. Digital image processing is fast and provides a distribution in high resolution in few seconds. The solution for the customer is a combination of the speed and possibilities of digital image processing with the contrast and accuracy of a goniophotometer.

The thesis shall give an overview of the currently existing measurement techniques for the determination of luminous intensity distributions. The main focus is to show for which measurement object which measurement technique is applicable. Where overlaps can be found, i.e. several measurement techniques can be used for the same object and vice versa, and where separation is necessary. Similarities and differences between the measurement techniques and the resulting advantages and disadvantages for the measurement of concrete objects will be discussed.

Es wird ein Messsystem vorgestellt, mit dessen Hilfe die Ausstrahlcharakteristik von Scheinwerfern mit einer ortsaufgelösten Leuchtdichte- und einer Mehrkanalspektralmessung bestimmt werden kann. Ausgehend von diesem Messsystem werden die Möglichkeiten der Erfassung von Farbabweichungen und anderen charakteristischen Merkmalen von Scheinwerfersystemen dargestellt. Im Besonderen wird dabei auf die Erfassung und Auswertung der Daten ein gegangen.