| Records |
| Author |
Gibbons, R.; Terry, T.; Bhagavathula, R.; Meyer, J.; Lewis, A. |
| Title |
Applicability of mesopic factors to the driving task |
Type |
Journal Article |
| Year |
2015 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Research and Technology |
| Volume |
48 |
Issue |
1 |
Pages |
70-82 |
| Keywords |
Lighting; Public Safety; Planning |
| Abstract |
With the advent of light-emitting diode technology being applied to roadway lighting, the spectral power distribution of the light source is becoming much more important. In this experiment, the detection of pedestrians at five adaptation levels under three light sources, high pressure sodium and light emitting diodes of two colour temperatures was measured in realistic roadway scenarios. The results show that while the light source type was not significant, an increase in adaptation luminance increased the detection distance. As the offset of the object to the roadway increased, some spectral effects became more significant; however, this effect was not consistent across all angles of eccentricity. The conclusions from this work indicate that mesopic factors may not be applicable on high-speed roads. |
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1477-1535 |
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LoNNe @ kyba @ |
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1382 |
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Pravettoni, M.; Strepparava, D.; Cereghetti, N.; Klett, S.; Andretta, M.; Steiger, M. |
| Title |
Indoor calibration of Sky Quality Meters: linearity, spectral responsivity and uncertainty analysis |
Type |
Journal Article |
| Year |
2016 |
Publication |
Journal of Quantitative Spectroscopy and Radiative Transfer |
Abbreviated Journal |
Journal of Quantitative Spectroscopy and Radiative Transfer |
| Volume |
181 |
Issue |
in press |
Pages |
74-86 |
| Keywords |
Instrumentation |
| Abstract |
The indoor calibration of brightness sensors requires extremely low values of irradiance in the most accurate and reproducible way. In this work the testing equipment of an ISO 17025 accredited laboratory for electrical testing, qualification and type approval of solar photovoltaic modules was modified in order to test the linearity of the instruments from few mW/cm2 down to fractions of nW/cm2, corresponding to levels of simulated brightness from 6 to 19 mag/arcsec2. Sixteen Sky Quality Meter (SQM) produced by Unihedron, a Canadian manufacturer, were tested, also assessing the impact of the ageing of their protective glasses on the calibration coefficients and the drift of the instruments. The instruments are in operation on measurement points and observatories at different sites and altitudes in Southern Switzerland, within the framework of OASI, the Environmental Observatory of Southern Switzerland. The authors present the results of the calibration campaign: linearity; brightness calibration, with and without protective glasses; transmittance measurement of the glasses; and spectral responsivity of the devices. A detailed uncertainty analysis is also provided, according to the ISO 17025 standard. |
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0022-4073 |
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LoNNe @ kyba @ |
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1399 |
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Warrant, E. |
| Title |
Superior vision in nocturnal insects inspires new night vision technologies |
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Newspaper Article |
| Year |
2016 |
Publication |
SPIE Newsroom |
Abbreviated Journal |
SPIE Newsroom |
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| Keywords |
Vision; Animals; Instrumentation |
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Algorithms that dramatically improve the quality of video sequences captured in very dim light have been developed on the basis of the neural mechanisms in nocturnal insects with excellent visual capabilities. |
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1818-2259 |
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LoNNe @ kyba @; GFZ @ kyba @ |
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1418 |
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Challéat, S.; Lapostolle, D. |
| Title |
Concilier éclairage urbain et environnement nocturne : Les enjeux d’une controverse sociotechnique |
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Journal Article |
| Year |
2014 |
Publication |
Natures Sciences Sociétés |
Abbreviated Journal |
Nat. Sci. Soc. |
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22 |
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4 |
Pages |
317-328 |
| Keywords |
History; Energy; Planning; Regulation; Society |
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La question de l’éclairage urbain nocturne est posée publiquement de manière de plus en plus significative, d’abord aux États-Unis puis en Europe. Cantonnée à l’origine au domaine de l’astronomie, cette question pose problème dans différents secteurs : l’environnement, la santé, l’urbanisme, mais aussi et surtout l’énergie... En croisant une approche sociologique avec une approche géographique, les auteurs font le récit d’une controverse environnementale aboutissant, en France, à l’inscription de la notion de pollution lumineuse dans la loi Grenelle et questionnent sa dimension spatiale. Ils montrent les différentes logiques et interprétations, à l’œuvre autour de la distinction entre « pollution » et « nuisance » lumineuses, qui traversent les scènes de négociation sur les processus de normalisation et la mobilisation d’outils de zonage. |
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French |
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French |
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1240-1307 |
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LoNNe @ kyba @ |
Serial |
1522 |
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| Author |
Bará, S. |
| Title |
Anthropogenic disruption of the night sky darkness in urban and rural areas |
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Journal Article |
| Year |
2016 |
Publication |
Royal Society Open Science |
Abbreviated Journal |
R. Soc. open sci. |
| Volume |
3 |
Issue |
10 |
Pages |
160541 |
| Keywords |
Skyglow |
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The growing emissions of artificial light to the atmosphere are producing, among other effects, a significant increase of the night sky brightness (NSB) above its expected natural values. A permanent sensor network has been deployed in Galicia (northwest of Iberian peninsula) to monitor the anthropogenic disruption of the night sky darkness in a countrywide area. The network is composed of 14 detectors integrated in automated weather stations of MeteoGalicia, the Galician public meteorological agency. Zenithal NSB readings are taken every minute and the results are openly available in real time for researchers, interested stakeholders and the public at large through a dedicated website. The measurements allow one to assess the extent of the loss of the natural night in urban, periurban, transition and dark rural sites, as well as its daily and monthly time courses. Two metrics are introduced here to characterize the disruption of the night darkness across the year: the significant magnitude (m1/3) and the moonlight modulation factor (γ). The significant magnitude shows that in clear and moonless nights the zenithal night sky in the analysed urban settings is typically 14–23 times brighter than expected from a nominal natural dark sky. This factor lies in the range 7–8 in periurban sites, 1.6–2.5 in transition regions and 0.8–1.6 in rural and mountain dark sky places. The presence of clouds in urban areas strongly enhances the amount of scattered light, easily reaching amplification factors in excess of 25, in comparison with the light scattered in the same places under clear sky conditions. The periodic NSB modulation due to the Moon, still clearly visible in transition and rural places, is barely notable at periurban locations and is practically lost at urban sites. |
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2054-5703 |
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no |
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LoNNe @ kyba @ |
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1544 |
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