Luminance spreading freeform lens arrays with accurate intensity control

Desnijder, Karel; Ryckaert, Wouter; Hanselaer, Peter; Meuret, Youri

doi:10.1364/oe.27.032994

Cited by 18 publications

(4 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, to realize Probeam lighting, it is necessary to design lenses in front of the (small sized) LED sources to generate the appropriate light distribution. 23,40,41 Although the Probeam concept seems to have some important advantages with respect to visibility and contrast, there are also some practical limitations. In Probeam luminaires, the light intensity is distributed over a narrow solid angle, as can be observed in Figure 6 (left).…”

Section: Discussionmentioning

confidence: 99%

An asymmetric road lighting concept: Probeam

Spieringhs,

Smet,

Heynderickx

et al. 2024

Lighting Research & Technology

View full text Add to dashboard Cite

An asymmetric road lighting concept known as Probeam is investigated in this study for energy efficiency, contrast and visibility of vertical objects and road markings in highway lighting. Calculations based on road lighting standards, road surface and markings reflection characteristics and typical Dutch highway geometry, reveal that Probeam lighting improves the average visibility of objects and road markings over symmetrical lighting, however, with a 14% increase in luminous flux as per current road lighting standards. This increase in luminous flux is attributed to the symmetrical lighting’s advantage in specular road surface reflection, leading to a reduction in the Counterbeam lobe size in the light intensity distribution when designed to meet the current road luminance requirement. Notably, by designing the Probeam luminaire to match symmetrical lighting’s average visibility of vertical objects, for removing the road luminance requirement and dimming the luminaire, energy consumption is reduced by 52%. Halving the Probeam luminaire’s mounting height leads to an impressive 82% energy savings. The study highlights the possibility of a balance in energy use and road safety using the Probeam concept, considering advancements in road luminaires and retroreflective materials. Due to glare, the relevance of the proposed Probeam concept is restricted to one-directional traffic on highways.

show abstract

Section: Discussionmentioning

confidence: 99%

An asymmetric road lighting concept: Probeam

Spieringhs,

Smet,

Heynderickx

et al. 2024

Lighting Research & Technology

View full text Add to dashboard Cite

show abstract

“…Thereby, they provide better results than numerical optimization methods [38], especially if the systems are complex. A great variety of design methods are known, for example ray mapping [39][40][41][42][43][44][45][46], forming surfaces using Cartesian ovals [47], the simultaneous multiple surface method in 2D [48] and 3D [38,49] or the tailored freeform design method proposed by Ries and Muschaweck [50]. Nowadays ray mapping approach, i.e., the combination of energy mapping in conjunction with geometrical surface construction, is in the focus of illumination research [39][40][41][42][43][44][45][46].…”

Section: Optic Design Methodsmentioning

confidence: 99%

Monolitic Hybrid Transmitter-Receiver Lens for Rotary On-Axis Communications

et al. 2020

View full text Add to dashboard Cite

High-speed rotary communication links exhibit high complexity and require challenging assembly tolerances. This article investigates the use of optical wireless communications (OWC) for on-axis rotary communication scenarios. First, OWC is compared with other state-of-the-art technologies. Different realization approaches for bidirectional, full-duplex links are discussed. For the most promising approach, a monolithic hybrid transmitter-receiver lens is designed by ray mapping methodology. Ray tracing simulations are used to study the alignment-depended receiver power level and to determine the effect of optical crosstalk. Over a distance of 12.5 m m , the lens achieves an optical power level at the receiver of − 16.2 dBm to − 8.7 dBm even for misalignments up to 3 m m .

show abstract

“…Since the emitter of an EEL is extremely small, therefore, when designing freeform beam-shaping lenses, it can be considered as a point source in the far field of the emitter. The zero-étendue design methods of freeform beam-shaping optics, which rely on ideal source assumption, include ray mapping method [11][12][13][14][15][16][17][18], Monge-Ampère (MA) equation method [19][20][21][22][23][24][25][26], and supporting quadric method [27][28][29][30][31][32]. Although the effectiveness of the current zeroétendue algorithms was verified in LED and collimated laser beam shaping, in which the input beam profile is rotationally symmetric about the optical axis or the aspect ratio of the input beam profile is relatively small.…”

Section: Introductionmentioning

confidence: 99%