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Discomfort glare under automotive conditions – spectral behavior and mechanisms

Bodrogi, Peter ; Wolf, Nicolai ; Khanh, Tran Quoc :
Discomfort glare under automotive conditions – spectral behavior and mechanisms.
[Online-Edition: http://www.emk.tu-darmstadt.de/lt/forschung/publikationen/20...]
In: International Symposium on Automotive Lighting, September 2011, Darmstadt. 9th International Symposium on Automotive Lighting Darmstadt
[Konferenz- oder Workshop-Beitrag], (2011)

Offizielle URL: http://www.emk.tu-darmstadt.de/lt/forschung/publikationen/20...

Kurzbeschreibung (Abstract)

A new experimental apparatus was constructed to study the spectral behaviour of discomfort glare and to explore its visual mechanisms. The apparatus includes two quasi-monochromatic optical channels to project quasi-monochromatic and quasi-bichromatic glare stimuli. Observation geometries and luminance levels address the practical application of automotive headlamps. To model oncoming automotive headlamps, a typical angular size of =0.1° was chosen on a typical background luminance of LB=0.1 cd/m2 and at a typical retinal eccentricity of =4.3° to the left of the fixation point where car headlamps tend to appear. The value of  =0° has also been considered for comparison. The de Boer value of 5 (just admissible) was chosen which is relevant for night time traffic and easy to set by the observer by adjusting a neutral density filter wheel. The apparatus consists of two interference filter wheels (10 nm HBW) constituting two optical channels each producing a quasi-monochromatic beam from the two Xenon short arc high-pressure lamps, a beam splitter to unite the two channels to produce a quasi-bichromatic beam. The glare source is a changeable 0.1°-0.5° aperture inside a glare observation booth illuminated by four dimmable white LEDs. The device is calibrated by a spectroradiometer looking into the booth and measuring spectral radiance at a white standard at the position of the subject’s left eye. Discomfort glare results have shown effects of both additive and opponent cone mechanisms. Opponent cone mechanisms e.g. |L-M| cause spectral non-additivity to be predicted by a new discomfort glare model. Due to the mesopic surround, the rod effect cannot be excluded.

Typ des Eintrags: Konferenz- oder Workshop-Beitrag (Keine Angabe)
Erschienen: 2011
Autor(en): Bodrogi, Peter ; Wolf, Nicolai ; Khanh, Tran Quoc
Titel: Discomfort glare under automotive conditions – spectral behavior and mechanisms
Sprache: Englisch
Kurzbeschreibung (Abstract):

A new experimental apparatus was constructed to study the spectral behaviour of discomfort glare and to explore its visual mechanisms. The apparatus includes two quasi-monochromatic optical channels to project quasi-monochromatic and quasi-bichromatic glare stimuli. Observation geometries and luminance levels address the practical application of automotive headlamps. To model oncoming automotive headlamps, a typical angular size of =0.1° was chosen on a typical background luminance of LB=0.1 cd/m2 and at a typical retinal eccentricity of =4.3° to the left of the fixation point where car headlamps tend to appear. The value of  =0° has also been considered for comparison. The de Boer value of 5 (just admissible) was chosen which is relevant for night time traffic and easy to set by the observer by adjusting a neutral density filter wheel. The apparatus consists of two interference filter wheels (10 nm HBW) constituting two optical channels each producing a quasi-monochromatic beam from the two Xenon short arc high-pressure lamps, a beam splitter to unite the two channels to produce a quasi-bichromatic beam. The glare source is a changeable 0.1°-0.5° aperture inside a glare observation booth illuminated by four dimmable white LEDs. The device is calibrated by a spectroradiometer looking into the booth and measuring spectral radiance at a white standard at the position of the subject’s left eye. Discomfort glare results have shown effects of both additive and opponent cone mechanisms. Opponent cone mechanisms e.g. |L-M| cause spectral non-additivity to be predicted by a new discomfort glare model. Due to the mesopic surround, the rod effect cannot be excluded.

Buchtitel: 9th International Symposium on Automotive Lighting
Band: 9
Ort: Darmstadt
Fachbereich(e)/-gebiet(e): Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektromechanische Konstruktionen > Lichttechnik
Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektromechanische Konstruktionen
Fachbereich Elektrotechnik und Informationstechnik
Veranstaltungstitel: International Symposium on Automotive Lighting
Veranstaltungsort: Darmstadt
Veranstaltungsdatum: September 2011
Hinterlegungsdatum: 19 Jan 2012 13:05
Offizielle URL: http://www.emk.tu-darmstadt.de/lt/forschung/publikationen/20...
Schlagworte in weiteren Sprachen:
Einzelne SchlagworteSprache
Discomfort glare, spectral behaviourEnglisch
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