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Träfflista för sökning "WFRF:(Löfving Björn 1970) "

Search: WFRF:(Löfving Björn 1970)

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1.
  • Billger, Monica, 1961, et al. (author)
  • An assessment method for evaluating colour rendering properties of light sources
  • 2015
  • In: Proceedings of the 28th Session of the CIE, Manchester, United Kingdom, 28 June – 4 July 2015. - 9783902842558 ; Volume 1:part 2, s. 954-963
  • Conference paper (peer-reviewed)abstract
    • Abstract We present an assessment method to evaluate how the spectral power distribution of light influences the perception of colours and small colour differences. Included in the method are several ways to measure properties of reflected light with a spectroradiometer, visual assessments of perceived colours, and a visual performance test that aims at identifying an individual minimum colour contrast visibility threshold. In a first application of the assessment method, we used a colour contrast test chart printed on paper and studied it under the illumination of three LED light sources, halogen light and daylight. We concluded that the visual performance test was effective for reviling visibility thresholds for colour contrasts and that the method has potential for understanding the influence of spectral power distribution on perceived colour and visual performance. The methodology can be useful for optimizing illumination for individual needs.
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  • Hedsten, Karin, 1964, et al. (author)
  • MEMS-based VCSEL beam steering using replicated polymer diffractive lens
  • 2008
  • In: Sensors and Actuators, A: Physical. - : Elsevier BV. - 0924-4247 .- 1873-3069. ; 142:1, s. 336-345
  • Journal article (peer-reviewed)abstract
    • Abstract. This paper describes a fully integrated micro-optical system, in which dynamic angular control of the beam from a VCSEL (vertical cavity surface emitting laser) is realized by laterally moving a collimat¬ing diffractive lens in the light path. The lens is mounted on a translatable silicon stage, which consists of a frame with an opening for the light to traverse the lens and electro-statically driven comb actuators, by which the lateral movement is achieved. Devices implementing both 1D and 2D scanning have been fabricated and evaluated. Integration of the lens onto the translatable silicon stage is done using a newly developed fabrication process based on hot embossing of an amorphous fluorocarbon polymer. This fabrication process relies on a reversed-order protocol, where the structuring of the optical element precedes the silicon microstructuring. Assembly and packaging of the VCSEL-MOEMS system, using LTCC (low temperature cofired ceramic) technique, is also demonstrated. Optical evaluation of the system and beam steering function shows significant beam deflection for a relatively low driving voltage (~70 V).
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  • Jonsson, Kenneth, et al. (author)
  • Traffic compensated luminance estimation
  • 2015
  • Reports (other academic/artistic)abstract
    • Active control of street light sources based on sensor data is desired to meet requirements on traffic safety and environmental protection. In this report, we summarise the results of a research study focusing on some of the fundamental problems occurring when performing real-world sensor measurements for lighting control. In particular, we present results on the impact of traffic and the relationship between sensor angle and measured road surface luminance. Moreover, we present a comparison between different approaches to estimating the veiling luminance in tunnel lighting applications.
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  • Result 1-10 of 21

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