Applied Prismatic and Reflective Optics

Vanderwerf, Dennis F.

doi:10.1117/3.867634

Cited by 16 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In order to reduce the multi-shadow effect, the luminance uniformity of the emitting surface should be higher than 73.5% [13]. In order to improve luminance uniformity, many different diffuser designs and working principles have been proposed [14][15][16][17]. Based on past research studies, we develop a double sided structural diffuser sheet to extend the emitting area of the LED as shown in Fig.…”

Section: Diffuser Sheet Design For Preventing Multi-shadow Effectsmentioning

confidence: 99%

Design and demonstration of high efficiency anti-glare LED luminaires for indoor lighting

Chiang¹,

Hsu²,

Pan³

2014

Opt. Express

View full text Add to dashboard Cite

An anti-glare luminaire design is proposed to reduce the effect of glare and the multi-shadow while preserving high optical efficiency, high illumination uniformity and low unified glare rating (UGR). Comparison to the traditional direct light emitting diode (LED) luminaire in optical simulations showed an enhancement of the illumination uniformity from 64.9% to 80.0%. The optical efficiency was 79.5%, and the UGR value was controlled under 18.8. For the actual measurement, the finished product had an illumination uniformity of 77.0%, optical efficiency of 76.0%, UGR value of 19.0, and efficacy of 81.4 lm/w. Through this design, the lighting performance was greatly enhanced.

show abstract

Section: Diffuser Sheet Design For Preventing Multi-shadow Effectsmentioning

confidence: 99%

Design and demonstration of high efficiency anti-glare LED luminaires for indoor lighting

Chiang¹,

Hsu²,

Pan³

2014

Opt. Express

View full text Add to dashboard Cite

show abstract

“…In particular, the nonimaging Fresnel lenses are designed with the objective of concentrating light rather than forming an image, in addition to maximize the amount (energy) and quality (flux uniformity) of solar radiation, see for example the references. [1][2][3][4][5][6][7][8][9][10] An Aspheric Fresnel-type lens (for short AFL) consists of a series of adjacent microprisms designed to vary the angle of refraction by programming the angles of the flat surfaces of each of the prisms, either to collimate or focus incident light. 11,12 AFL have important properties since they reduce the thickness of the lens and less material is used in its construction producing lighter designs.…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of aspheric Fresnel-type lenses for solar energy by using a 3D printer

Jiménez-Rodríguez,

Avendaño-Alejo,

Ponce-Hernández

et al. 2024

Optical Fabrication and Testing VIII

View full text Add to dashboard Cite

Traditionally, the Fresnel-type lens design often assumes thin lenses, since lenses of finite thickness cannot be completely described in analytical terms, then a numerical solution has to be found. We implement an exact ray trace considering a plane wavefront incident by reducing as much as possible the area of light concentration, while increasing the concentration ratio of energy. In such a way that we have mathematically determined a function to compute groove angles, to refract a bundle of rays from each planar echelon, which are propagated into a predetermined area of energy collection. In addition, we can evaluate the performance of the Fresnel-type lens design for a solar collector. Thus, an analytical formula to calculate the optical efficiency is obtained, in terms of the geometrical losses widely studied for nonimaging systems, such as blocking losses. Finally, the proposed aspherical Fresnel lens design is fabricated using a commercial 3D printer and subsequently polishing the surface for better performance. In this fashion we could test the performance of the manufactured prototype.

show abstract

“…In this work we will implement this knowledge for the design of the classical type of LFR which considers exclusively a single linear absorber. [5][6][7][8][9] Traditionally, the nature of the mathematics used in the design of Fresnel systems sometimes does not allow to provide an analytical formulation to describe the reflecting surface. Therefore, numerical solutions may be called for.…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of a linear Fresnel-type reflector for solar concentration based on caustic surfaces by reflection

Jiménez-Rodríguez,

Avendaño-Alejo,

Román-Hernández

et al. 2023

Advances in Solar Energy: Heliostat Systems Design, Implementation, and Operation

View full text Add to dashboard Cite

We have designed a Linear Fresnel-type Reflector (LFR) to reduce the area of light concentration based on the caustic surfaces produced by reflection. The LFR is designed by a set of planar mirrors, which appropriately have slopes in such a way that input energy can be focused at predefined absorber area. Also, losses due to riser steps were obtained from a geometrical point of view, to reduce and reconfigure the LFR shape in order to facilitate its manufacture. Finally, a LFR prototype will be fabricated on a single aluminum sheet where their grooves will be molded through CNC machine.

show abstract

Applied Prismatic and Reflective Optics

Cited by 16 publications

References 0 publications

Design and demonstration of high efficiency anti-glare LED luminaires for indoor lighting

Design and demonstration of high efficiency anti-glare LED luminaires for indoor lighting

Design and fabrication of aspheric Fresnel-type lenses for solar energy by using a 3D printer

Design and fabrication of a linear Fresnel-type reflector for solar concentration based on caustic surfaces by reflection

Contact Info

Product

Resources

About