نتایج جستجو برای: fresnel lenses

تعداد نتایج: 15913  

Journal: :IOP Conference Series: Materials Science and Engineering 2016

2011
T. A. Elwi H. M. Al-Rizzo

Fresnel lenses are low-cost optical elements used for focusing sunlight to solar panels to ensure operation under highflux density. However, the conventional Fresnel lens has a relatively high material usage and hence contributes to additional efficiency degradation. Moreover, traditional design of Fresnel lenses introduces additional prismatic facets, due to deviations in manufacturing, which ...

2015
Yi-Cheng Chen Hung-Wei Chiang

The goal of this presented study was to determine the optimum parameters of secondary optical elements (SOEs) for concentrated photovoltaic (CPV) units with flat Fresnel lenses. Three types of SOEs are under consideration in the design process, including kaleidoscope with equal optical path design (KOD), kaleidoscope with flat top surface (KFTS), and open-truncated tetrahedral pyramid with spec...

2014
Brian Foley

Solar cookers are aimed at reducing pollution and desertification in the developing world. However, they are often disregarded as they do not give users the ability to cook after daylight hours. The Wilson solar cooker is a solar cooker designed to address this problem by converting solar energy and storing that energy as heat in the form of molten salt (lithium nitrate). This thesis involved r...

Journal: :Quantum Information & Computation 2009
Erik W. Streed Benjamin G. Norton Justin J. Chapman David Kielpinski

Efficient ion-photon coupling is an important component for large-scale ion-trap quantum computing. We propose that arrays of phase Fresnel lenses (PFLs) are a favorable optical coupling technology to match with multi-zone ion traps. Both are scalable technologies based on conventional micro-fabrication techniques. The large numerical apertures (NAs) possible with PFLs can reduce the readout ti...

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