Results 261 to 270 of about 655,925 (308)

Acoustic Tweezers Based on Linear Fresnel Lens with Air Cavities for Large Volume Particle Trapping

IEEE/LEOS International Conference on Optical MEMS, 2019
This paper reports a novel acoustic tweezers with multi-foci linear Fresnel lens that was designed to create a large Bessel beam zone for contactless, non-invasive object trapping in liquid. The tweezers was built on a 1-mm-thick lead zirconate titanate (
Yongkui Tang, E. S. Kim
semanticscholar   +1 more source

Recursive fresnel lens

This research introduces a novel optical framework that extends the Fresnel lens concept into a fractal, golden-ratio-based geometry, capable of producing multi-depth focusing and artificial lensing effects without gravitational or conventional refractive means.
openaire   +1 more source

60 GHz planar fresnel zone lens

2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2015
In this paper, we present the design guidelines of a planar Fresnel zone lens, where each zone has a certain permittivity. The different permittivities are realized by perforating a dielectric of higher permittivity. We designed a lens that adds 13 dB of gain to a patch antenna.
Xiaozhou Wang, Michael Jenning, Dirk Plettemeier   +2 more
openaire   +1 more source

Fresnel lens on new photosensitive material

SPIE Proceedings, 2005
In this work we describe a lithographic technique for fabrication of Fresnel lenses. This technique is achieved using a photo mask and Norland Optical Adhesive No. 65. The main characteristics of this lens are his low cost and its flexibility due to the material. Some experimental results are shown.
M. Ortiz-Gutierrez, M. A. Salgado-Verduzco, A. Olivares-Perez, J. L. Juarez-Perez, M. Perez-Cortes, J. C. Ibarra-Torres, J. Castro-Ramos   +6 more
openaire   +1 more source

Ultralight inflatable fresnel lens solar concentrators

AIP Conference Proceedings, 1998
Since 1986, ENTECH and NASA Lewis have been developing refractive solar concentrators for space applications. These Fresnel lens concentrators can be configured as either point-focus dome lenses or line-focus cylindrical lenses. Small point-focus or line-focus lenses can be used to concentrate sunlight onto solar cells in space photovoltaic (PV) arrays.
Mark J. O’Neill, Michael F. Piszczor
openaire   +1 more source

Experimental investigation of a bubbling humidification-dehumidification desalination system directly heated by cylindrical Fresnel lens solar concentrator

, 2021
Xiao Jianwei, Hongfei Zheng, Rihui Jin, Shen Liang, Ge Wang, Xinglong Ma   +5 more
semanticscholar   +1 more source

Color-corrected Fresnel lens for solar concentration

Optics Letters, 1980
A new linear convex Fresnel lens with its groove side down is described. The design philosophy is similar to that of the highly concentrating two-focal Fresnel lens but includes a correction for chromatic aberration. A solar-concentration ratio as high as 80 is achieved. For wide-acceptance angles, the concentration nears the theoretical maximum.
openaire   +2 more sources

A new designed linear Fresnel lens solar concentrator based on spectral splitting for passive cooling of solar cells

, 2021
Soroush Kiyaee, Y. Saboohi, A. Moshfegh
semanticscholar   +1 more source

Study on design and performance enhancement of Fresnel lens solar concentrator

Materials Today: Proceedings, 2021
Chetan Y. Bachhav, P. D. Sonawwanay
semanticscholar   +1 more source

Process for designing a freeform Fresnel lens

Optical Engineering, 2010
This paper describes a process for designing a faceted freeform Fresnel lens. Where a traditional Fresnel lens uses a profile revolved around a central axis, a freeform Fresnel lens uses individual triangular or trapezoidal facets that comprise a freeform surface. This type of lens combines the capability of a freeform surface with the benefits of a
openaire   +1 more source