Impact of the accurateness of bidirectional reflectance distribution function data on the intensity and luminance distributions of a light-emitting diode mixing chamber as obtained by simulations

Audenaert, Jan; Leloup, Frédéric; Giel, Bart Van; Durinck, Guy; Hanselaer, Peter

doi:10.1117/1.oe.52.9.095101

Cited by 7 publications

(9 citation statements)

References 8 publications

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“…Luminous intensity distribution (LID) was simulated, which was validated against the measured data with a near-field goniophotometer. Although a good agreement between the measured and simulated LID was found, the luminance distributions only corresponded when the most accurate BRDF model was applied, indicating that more complex models are needed for evaluation of luminance distributions [7].…”

Section: Open Accessmentioning

confidence: 94%

“…Dong et al [6] applied the simulation technique to design the LED lighting with the uniform irradiance for the proper optical design. Audenaert et al [7] performed the parametric study to assess the impact of important input parameters on the accuracy of the ray tracing simulation results such as the bidirectional reflectance distribution function (BRDF). Luminous intensity distribution (LID) was simulated, which was validated against the measured data with a near-field goniophotometer.…”

Section: Open Accessmentioning

confidence: 99%

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Window Material Daylighting Performance Assessment Algorithm: Comparing Radiosity and Split-Flux Methods

Yoon

Jeong

2014

Energies

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Abstract:Windows are the primary aperture to introduce solar radiation to the interior space of a building. This experiment explores the use of EnergyPlus software for analyzing the illuminance level on the floor of a room with reference to its distance from the window. For this experiment, a double clear glass window has been used. The preliminary modelling in EnergyPlus showed a consistent result with the experimentally monitored data in real time. EnergyPlus has two mainly used daylighting algorithms: DElight method employing radiosity technique and Detailed method employing split-flux technique. Further analysis for illuminance using DElight and Detailed methods showed significant difference in the results. Finally, we compared the algorithms of the two analysis methods in EnergyPlus.

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Section: Open Accessmentioning

confidence: 94%

Section: Open Accessmentioning

confidence: 99%

Window Material Daylighting Performance Assessment Algorithm: Comparing Radiosity and Split-Flux Methods

Yoon

Jeong

2014

Energies

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“…Dong et al [4] applied the simulation technique to design the LED lighting with the uniform irradiance for the proper optical design. Audenaert et al [5] performed the parametric study to assess the impact of important input parameters on the accuracy of the ray tracing simulation results such as the bidirectional reflectance distribution function (BRDF). Luminous intensity distribution (LID) was simulated, which was validated against the measured data with a near-field goniophotometer.…”

Section: Background and Purposementioning

confidence: 99%

Section: Background and Purposementioning

confidence: 99%

Comparative Study of Two Daylighting Analysis Methods with Regard to Window Orientation and Interior Wall Reflectance

Yoon

Manandhar

2014

Energies

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Abstract:The accuracy and speed of the daylighting analysis developed for use in EnergyPlus is better than its predecessors. In EnergyPlus, the detailed method uses the Split-flux algorithm whereas the DElight method uses the Radiosity algorithm. Many existing studies have addressed the two methods, either individually or compared with other daylight analysis methods like Ray tracing but still there is lack of detailed comparative study of these two methods. Our previous studies show that the Split-flux method overestimates the illuminance, especially for the areas away from the window. The Radiosity method has the advantage of accurately predicting this illuminance because of how it deals with the diffuse light. For this study, the EnergyPlus model, which has been calibrated using data measured in a real building in previous studies, has also been used. The calibrated model has a south oriented window only. This model is then used to analyze the interior illuminance inside the room for north, west and east orientation of the window by rotating the model and by changing the wall reflectance of the model with south oriented window. Direct and diffuse component of the illuminance as well as the algorithms have been compared for a detailed analysis.

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“…computer graphics 2-3 , remote sensing [4][5] , appearance characterization [6][7] and lighting design [8][9] . In result, many BRDF and BTDF measuring instruments *Frederic.leloup@kuleuven.be; phone +32 9 265.87.13; fax +32 9 225.62.69; www.lichttechnologie.be have been reported in the literature 10 .…”

Section: Introductionmentioning

confidence: 99%

Rapid determination of the photometric bidirectional scatter distribution function by use of a near-field goniophotometer

Leloup

Ketelaere²,

Audenaert

et al. 2014

SPIE Proceedings

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The bidirectional scatter distribution function (BSDF) characterizes the scattering properties of a material for any angle of illumination or viewing, and offers as such a complete description of the spatial optical characteristics of the surface. An accurate determination of the BSDF is important in many scientific domains, such as computer graphics, architectural and lighting design, and the field of material appearance characterization (e.g. the color and gloss properties).Many BSDF measuring instruments have been reported in the literature. The majority of these instruments are goniometric measurement devices, by use of which the BSDF is determined by scanning all incoming and outgoing light flux directions in sequence. For this, the sample, detector, and/or source perform relative individual movements. In result, the major restriction of this type of instruments constitutes the measurement time, which may run to the order of several hours depending on the accuracy (angular resolution) and the complexity (spectral coverage, absolute measurement capability, etc.) of the reported measurement data. This paper describes the results of a feasibility study, in which an alternative goniometric measurement system is designed, enabling to acquire the photometric BSDF in a full three-dimensional (3D) space, with a high mechanical angular resolution (0.1°) in a time efficient way (about 30 minutes). A near-field goniophotometer, originally intended to measure luminance intensity distributions and luminous fluxes of light sources and luminaires, was converted for this purpose. Besides a discussion of the design and the measurement procedure, test sample measurements are presented to illustrate the versatility of the device.

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Impact of the accurateness of bidirectional reflectance distribution function data on the intensity and luminance distributions of a light-emitting diode mixing chamber as obtained by simulations

Cited by 7 publications

References 8 publications

Window Material Daylighting Performance Assessment Algorithm: Comparing Radiosity and Split-Flux Methods

Window Material Daylighting Performance Assessment Algorithm: Comparing Radiosity and Split-Flux Methods

Comparative Study of Two Daylighting Analysis Methods with Regard to Window Orientation and Interior Wall Reflectance

Rapid determination of the photometric bidirectional scatter distribution function by use of a near-field goniophotometer

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