In this paper, an experimental instrument design for the measurement of the luminance of the rear license plate lamp was presented. The instrument is based on the photometric principle, which makes it more cost-effective than the commercial luminance meters. At the same time it was not necessary to compromise the accuracy. Luminance measurements have been made on a piece of clean blotting paper with the same dimensions as the license plate and with a minimum diffuse reflection factor of 70 percent. The test requirements for the rear license plate equipped with LED lamps and tungsten filament lamps are defined in the ECE regulation. A photometer head with a two-axis movement stage was constructed for the investigation of the luminance distributions. The photometer can be mounted on the x-y moving stage or an optical bench. The principle of measurement is to form a solid angle of the license plate to be examined by means of the artificial pupil arrays. The light passing through both the artificial pupil arrays and the circular arrays is collected by a scanning photometer head. For the verification of the proposed instrument, the system configuration and the illumination of the space to be occupied by the plate are determined. Thus the illumination of the license plate can be expressed in terms of luminance which is the illumination divided by the solid angle.
A simplicity instrument for the luminance measurement of the rear license plate lamps
Einfaches Instrument für die Messung der Luminanz der hinteren Kennzeichenlampen
2005
7 Seiten, 5 Bilder, 2 Tabellen, 2 Quellen
Conference paper
English
LICENSE PLATE LAMPS (REAR REGISTRATION PLATE LAMPS)
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