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Proceedings Paper

NICOLAU: compact unit for photometric characterization of automotive lighting from near-field measurements
Author(s): Santiago Royo; Maria Jesus Arranz; Josep Arasa; Michel Cattoen; Thierry Bosch
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Paper Abstract

The present works depicts a measurement technique intended to enhance the characterization procedures of the photometric emissions of automotive headlamps, with potential applications to any light source emission, either automotive or non-automotive. A CCD array with a precisely characterized optical system is used for sampling the luminance field of the headlamp just a few centimetres in front of it, by combining deflectometric techniques (yielding the direction of the light beams) and photometric techniques (yielding the energy travelling in each direction). The CCD array scans the measurement plane using a self-developed mechanical unit and electronics, and then image-processing techniques are used for obtaining the photometric behaviour of the headlamp in any given plane, in particular in the plane and positions required by current normative, but also on the road, on traffic signs, etc. An overview of the construction of the system, of the considered principle of measurement, and of the main calibrations performed on the unit is presented. First results concerning relative measurements are presented compared both to reference data from a photometric tunnel and from a plane placed 5m away from the source. Preliminary results for the absolute photometric calibration of the system are also presented for different illumination beams of different headlamps (driving and passing beam).

Paper Details

Date Published: 16 February 2005
PDF: 10 pages
Proc. SPIE 5663, Photonics in the Automobile, (16 February 2005); doi: 10.1117/12.593289
Show Author Affiliations
Santiago Royo, Univ. Politecnica de Catalunya (Spain)
Maria Jesus Arranz, Univ. Politecnica de Catalunya (Spain)
Josep Arasa, Univ. Politecnica de Catalunya (Spain)
Michel Cattoen, Institut National Polytechnique de Toulouse (France)
Thierry Bosch, Institut National Polytechnique de Toulouse (France)

Published in SPIE Proceedings Vol. 5663:
Photonics in the Automobile
Thomas P. Pearsall, Editor(s)

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