Results 31 to 40 of about 32,036 (281)

Researches on the development of an optical system for improving the efficiency of photovoltaic panels [PDF]

E3S Web of Conferences, 2020
The paper aims to create a unit using Fresnel lenses. This module consist of an arrangement of planar-convex Fresnel lenses, made of methyl polymethacrylate, mounted in a hexagonal raster and bent to form a dome for collecting and amplifying solar ...
Rizescu Dana, Rizescu Ciprian Ion, Alionte Cristian Gabriel   +2 more
doaj   +1 more source

Panoramic optical and near-infrared SETI instrument: optical and structural design concepts [PDF]

, 2018
We propose a novel instrument design to greatly expand the current optical and near-infrared SETI search parameter space by monitoring the entire observable sky during all observable time.
Ackermann, Angel, Bunner, Chambers, Davis, Davis, Ellingson, Fujii, Howard, Law, Maire, Maire, Mészáros, Oosterloo, Petigura, Wright, Wright   +16 more
core   +2 more sources

Detection of ultra-high energy cosmic ray showers with a single-pixel fluorescence telescope [PDF]

, 2015
We present a concept for large-area, low-cost detection of ultra-high energy cosmic rays (UHECRs) with a Fluorescence detector Array of Single-pixel Telescopes (FAST), addressing the requirements for the next generation of UHECR experiments.
Bertaina, M., Casolino, M., Dawson, B., Fujii, T., Horvath, P., Hrabovsky, M., Jiang, J., Malacari, M., Mandat, D., Matalon, A., Matthews, J. N., Motloch, P., Palatka, M., Pech, M., Privitera, P., Schovanek, P., Takizawa, Y., Thomas, S. B., Travnicek, P., Yamazaki, K.   +19 more
core   +2 more sources

Design of Novel Compound Fresnel Lens for High-Performance Photovoltaic Concentrator

International Journal of Photoenergy, 2012
We present a new design of compound Fresnel-R concentrator which is composed of two lenses: a primary lens (Fresnel lens) that works by total internal reflection at outer sawteeth but refraction at inner sawteeth, and a ringed secondary lens that works ...
Lei Jing, Hua Liu, Huifu Zhao, Zhenwu Lu, Hongsheng Wu, He Wang, Jialin Xu   +6 more
doaj   +1 more source

A Fresnel lenses based concentrated PV system in a greenhouse [PDF]

, 2011
The scope of this investigation is the development and testing of a new type of greenhouse with an integrated linear Fresnel lens, receiver module and an innovative system for tracking to exploit all direct radiation in a solar energy system.
Gieling, T.H., Janssen, H.J.J., Sonneveld, P.J., Swinkels, G.L.A.M., Tuijl, B.A.J., van   +4 more
core   +2 more sources

Fresnel reflections in inverse freeform lens design

Journal of the Optical Society of America A, 2022
In this paper we propose a method to design a freeform lens including the effect of Fresnel reflections on the transmitted intensity. This method is elaborated for a lens with one freeform surface shaping a far-field target from a point source or collimated input beam.
A. H. van Roosmalen, M. J. H. Anthonissen, W. L. IJzerman, J. H. M. ten Thije Boonkkamp   +3 more
openaire   +3 more sources

LED Uniform Illumination Using Double Linear Fresnel Lenses for Energy Saving

Energies, 2017
We present a linear Fresnel lens design for light-emitting diode (LED) uniform illumination applications. The LED source is an array of LEDs. An array of collimating lens is applied to collimate output from the LED array.
Ngoc Hai Vu, Thanh Tuan Pham, Seoyong Shin   +2 more
doaj   +1 more source

Daylighting System Based on Novel Design of Linear Fresnel lens

Buildings, 2017
In this paper, we present a design and optical simulation of a daylighting system using a novel design of linear Fresnel lens, which is constructed based on the conservation of optical path length and edge ray theorem. The linear Fresnel lens can achieve
Thanh Tuan Pham, Ngoc Hai Vu, Seoyong Shin   +2 more
doaj   +1 more source

Rapid Fabrication of Continuous Surface Fresnel Microlens Array by Femtosecond Laser Focal Field Engineering

Micromachines, 2020
Femtosecond laser direct writing through two-photon polymerization has been widely used in precision fabrication of three-dimensional microstructures but is usually time consuming.
Linyu Yan, Dong Yang, Qihuang Gong, Yan Li   +3 more
doaj   +1 more source

The Effect of Fresnel Lens Focal Point Location on Heat Transfer in Phase Change Material (PCM) Enhanced Dynamic Solar Facade

Environmental and Climate Technologies, 2022
In recent years, the demand for energy-efficient technological solutions in the building sector has risen significantly worldwide. The exploitation of phase change material as a medium for thermal energy storage in building envelopes has increased due to
Narbuts Jānis, Blumberga Andra, Zundāns Zigmārs, Freimanis Ritvars, Bāliņš Roberts, Vanaga Ruta   +5 more
doaj   +1 more source