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Optical Engineering

Compact low-cost unit for photometric testing of automotive headlamps
Author(s): Santiago Royo; Maria Jesus Arranz; Josep Arasa; Michel Cattoen; Thierry M. Bosch
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Paper Abstract

A novel proposal for low-cost photometric testing of automotive headlamps is presented, using a combination of well-known optical metrology principles. Deflectometric measurement techniques and CCD-based photometry permit the precise measurement of the energy distribution and the direction of propagation on a plane close to the headlamp, while simple image-processing techniques permit the far-field photometric distribution on a distant plane to be reconstructed from the near-field data measured. The setup constructed and the main calibrations involved are presented, and results for different headlamp models are shown. The technique may be applied to light sources other than headlamps in order to calculate far-field distributions on any predefined surface of interest from near-field measurements.

Paper Details

Date Published: 1 June 2006
PDF: 8 pages
Opt. Eng. 45(6) 063602 doi: 10.1117/1.2213622
Published in: Optical Engineering Volume 45, Issue 6
Show Author Affiliations
Santiago Royo, Univ. Politècnica de Catalunya (Spain)
Maria Jesus Arranz, Univ. Politècnica de Catalunya (Spain)
Josep Arasa, Univ. Politècnica de Catalunya (Spain)
Michel Cattoen, Institut National Polytechnique de Toulouse (France)
Thierry M. Bosch, Institut National Polytechnique de Toulouse (France)

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