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Discomfort glare under automotive conditions – spectral behavior and mechanisms

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

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.

Item Type: Conference or Workshop Item
Erschienen: 2011
Creators: Bodrogi, Peter Zsolt and Wolf, Nicolai and Khanh, Tran Quoc
Title: Discomfort glare under automotive conditions – spectral behavior and mechanisms
Language: English
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.

Title of Book: 9th International Symposium on Automotive Lighting
Volume: 9
Place of Publication: Darmstadt
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Light Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology
Event Title: International Symposium on Automotive Lighting
Event Location: Darmstadt
Event Dates: September 2011
Date Deposited: 19 Jan 2012 13:05
Official URL: http://www.emk.tu-darmstadt.de/lt/forschung/publikationen/20...
Alternative keywords:
Alternative keywordsLanguage
Discomfort glare, spectral behaviourEnglish
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