The ray data measured by means of modern near-field goniophotometers open up new ways in the development of optical systems. For numerous applications, synthetic models of radiation characteristics are insufficient for realistic optical simulations. The description of the radiation conditions of an object requires to indicate the ray density distribution in all surface points of this object. These data can only be acquired using image-resolving measuring procedures. In the case of the RiGO801 near-field goniophotometers presented in the paper, a measuring camera is moved on a spherical surface around the measuring object by means of a goniometer mechanical system. In doing so, image data are recorded in a well-defined angular grid. Usually, the measuring camera is equipped with a specially adapted V(Lambda) - filter for measuring luminances. Using other suitable filters, it is possible to realize, for example, standard spectral value functions so as to measure multichannel color information during several measuring series. All luminance captures put together make up a four-dimensional data field. The data field measured contains all photometric information of light radiation. Derived quantities such as the luminous flux and the far-field luminance distribution can be calculated from the ray data. Ray data measured describe the real light source, thus making a complex physical model unnecessary. For the simulation of an LED-bicycle headlamp (reflector and cap) the use of ray data records allowed the realization of the system in only two iterations. In the development of new types of lamps (e.g. Hg-free arc lamps) the near-field goniometer makes it possible to realize single, high resolution luminance captures using the LMK2000 luminance measuring software.
Ray data of LEDs and arc lamps
Strahlendaten von LED und Lichtbogenlampen
2005
8 Seiten, 9 Bilder, 6 Quellen
Conference paper
English
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