Results 21 to 30 of about 32,036 (281)
Achromatic polymer-dispersed liquid crystal lens with diffractive–refractive hybrid structure
Materials Research Express, 2023 The focal length of liquid crystal Fresnel lens is electrically controllable, but the disadvantage is the chromatic aberration is obvious. In this paper, the electrically controlled zoom characteristics of liquid crystal lens and the basic theory of ...
Binming Liang, Jing An, Xin Su
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A Swimming Goggles Optical Design by Fresnel Lenses
Engineering Proceedings, 2023 Currently, many swimming goggle lenses use optical plates to maintain zero refractive power in air and water. However, people’s widespread use of 3C products has increased myopia significantly, so lenses have a demand for refractive power.
Feng-Ming Yeh +6 more
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Panoramic optical and near-infrared SETI instrument: prototype design and testing [PDF]
, 2018 The Pulsed All-sky Near-infrared Optical Search for ExtraTerrestrial Intelligence (PANOSETI) is an instrument program that aims to search for fast transient signals (nano-second to seconds) of artificial or astrophysical origin.
Antonio, Franklin +14 more
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Chocolate Terahertz Fresnel Lens
Photonics Letters of Poland, 2020 Recent enormous development of 3D printing techniques gave the possibility of precise manufacturing of designed optical structures. This paper presents designing, manufacturing and the results obtained for chocolate Fresnel lens. Chocolate, similarly to wax, can be melted and used in the 3D printed form to create a terahertz (THz) optical element ...
Mateusz Surma +3 more
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Pinhole Zone Plate Lens for Ultrasound Focusing
Sensors, 2017 The focusing capabilities of a pinhole zone plate lens are presented and compared with those of a conventional Fresnel zone plate lens. The focusing properties are examined both experimentally and numerically.
Constanza Rubio +5 more
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A novel achromatic Fresnel lens for high concentrating photovoltaic systems [PDF]
, 2016 In this paper we present a novel manufacturing method to produce achromatic Fresnel lenses for photovoltaic application. These achromatic lenses are capable of reaching a concentration factor three times higher than that attained by a conventional ...
Antón Hernández, Ignacio +4 more
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Multispectral Imaging with Fresnel Lens
, 2023 This paper presents a Multispectral imaging (MSI) approach that combines the use of a diffractive optical element, and a deep learning algorithm for spectral reconstruction. Traditional MSI techniques often face challenges such as high costs, compromised spatial or spectral resolution, or prolonged acquisition times. In contrast, our methodology uses a
Cohen, Khen, Kay, Tuval
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Secondary focusable and uniform convergence microprism in concentrating photovoltaic module [PDF]
E3S Web of Conferences, 2022 Low tracking accuracy of trackers, structure vibration by winds, and lens deformation by temperature lead to non-vertical incident irradiation of Fresnel lens, which necessitates a secondary concentrator in actual engineering application of concentrating
Guo Limin +5 more
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Приборы и методы измерений, 2023 For widely used LED sources there is a sharp decrease in the illumination of the working plane from the center to the edge. The purpose of this study was to analyze the effectiveness of Fresnel lenses usage as a fairly simple and technological element to
P. S. Bogdan +4 more
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Achromatic Fresnel Lens with Improved Efficiency for PV Systems
International Journal of Photoenergy, 2014 This work is aimed to design and evaluate different achromatic Fresnel lens solutions capable of operating as concentrators aimed at photovoltaic cells systems. Throughout this study, the theoretical parametric design of the achromatic lens will be shown
Mario González Montes +4 more
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