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dc.contributor.authorRoyo Royo, Santiago
dc.contributor.authorArranz, María Jesús
dc.contributor.authorArasa, Josep
dc.contributor.authorCattoen, Michel
dc.contributor.authorBosch, Thierry
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Òptica i Optometria
dc.date.accessioned2020-04-16T06:41:03Z
dc.date.available2020-04-16T06:41:03Z
dc.date.issued2006-12-01
dc.identifier.citationRoyo, S. [et al.]. New cost-effective sensor for the characterization of automotive headlamps by measurements in the near field. "Sensors and actuators A. Physical", 1 Desembre 2006, vol. 132, núm. 1, p. 56-62.
dc.identifier.issn0924-4247
dc.identifier.urihttp://hdl.handle.net/2117/183510
dc.description.abstractNowadays, European Normative regarding headlamp validation evaluates the photometric distribution of the source as a series of illumination values measured at a plane placed 25 m away from the light source. An innovative and inexpensive approach to test this photometric distribution is presented. We propose to sample the luminance field at a plane placed a few centimetres in front of the headlamp displacing a CCD camera at an adjustable number of positions. A specific processing of the sequence images allows simultaneously measuring the direction of propagation through deflectometric techniques and the energy of the light beams leaving the source through photometric techniques. Image-processing techniques may then be applied to these data in order to evaluate the photometric distribution in any predefined distant surface. An overview of the unit, of the measurement principle, and of the main calibrations performed is presented along the paper. In particular, the techniques for the calibration of the global constant converting CCD grey level values into photometric units are described and applied to different distributions. Finally, the comparison of computed illumination maps using the unit with reference measurements at photometric tunnels is presented, showing good agreement and demonstrating the validity of the approach.
dc.format.extent7 p.
dc.language.isoeng
dc.publisherElsevier
dc.subjectÀrees temàtiques de la UPC::Ciències de la visió::Òptica física
dc.subject.lcshPhotometry
dc.subject.lcshAutomobile industry and trade
dc.subject.lcshImage processing
dc.subject.otherAutomotive
dc.subject.otherHeadlamps
dc.subject.otherPhotometry
dc.subject.otherNear-field
dc.subject.otherOptical testing
dc.subject.otherCCD
dc.subject.otherLight sources
dc.titleNew cost-effective sensor for the characterization of automotive headlamps by measurements in the near field
dc.typeArticle
dc.subject.lemacFotometria
dc.subject.lemacAutomòbils -- Indústria i comerç
dc.subject.lemacImatges -- Processament
dc.contributor.groupUniversitat Politècnica de Catalunya. GREO - Grup de Recerca en Enginyeria Òptica
dc.identifier.doi10.1016/j.sna.2006.05.032
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/abs/pii/S0924424706003827
dc.rights.accessOpen Access
local.identifier.drac27715045
dc.description.versionPostprint (author's final draft)
local.citation.authorRoyo, S.; Arranz, M.; Arasa, J.; Cattoen, M.; Bosch, T.
local.citation.publicationNameSensors and actuators A. Physical
local.citation.volume132
local.citation.number1
local.citation.startingPage56
local.citation.endingPage62


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