Fresnel lens


Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
click for a larger image
Fresnel lens
Prisms that make up a
Fresnel lens bend and
magnify light rays, creating
a single, concentrated beam
of light.

Fres·nel lens

 (frə-nĕl′)
n.
A thin optical lens consisting of concentric rings of segmental lenses and having a short focal length, used primarily in lighthouses, spotlights, overhead projectors, and the headlights of motor vehicles.

[After Augustin Jean Fresnel.]

Fresnel lens

n
(General Physics) a lens consisting of a number of smaller lenses arranged to give a flat surface of short focal length
[C20: named after Augustin Jean Fresnel (1788–1827), French physicist]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Fresnel lens - lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal lengthFresnel lens - lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length
headlamp, headlight - a powerful light with reflector; attached to the front of an automobile or locomotive
lens, lens system, lense - a transparent optical device used to converge or diverge transmitted light and to form images
searchlight - a light source with reflectors that projects a beam of light in a particular direction
Translations
References in periodicals archive ?
In addition to the 3D beam splitter, the researchers have used nanoimprint lithography to fabricate a Fresnel lens on the end of an optical fiber.
The supplier's Fresnel Lens film is featured on the La Mia Perla fragrance carton, which is described in detail later in this article.
Pyroelectric sensors in combination with a multi-focal fresnel lens have been the best value solution for most applications dealing with motion detection to date; however, this approach is reaching its limitations as devices continue to become smaller and more compact.
Motion detectors containing one PIR sensor, a Fresnel lens with a cone-type beam, and a binary output are very efficient for detecting any type of motion, including human or pet motion.
The fact that it was a Fresnel lens, made out of many concentric rings of glass fit together with a microscopic amount of space between them, meant that a specialist had to be employed to make sure the lenses were workable and accurate.
The Mew Island apparatus, a rare hyper-radial Fresnel lens, will become the latest attraction in the historic district.
Other interesting artifacts that will be on exhibit include the fourth-order Fresnel lens from the Ship Island lighthouse.
The concentrator is a Fresnel lens, a prism-like optics design that was originally developed to increase the intensity of beams emanating from lighthouses.
But for all of the detailed historical description that populates her careful depiction of the Fresnel lens and its production in the 19th century, the book lacks a compelling narrative or even larger context within which this feat can be fully appreciated.
Mr Scott added: "We also had a series of accidents where cars were undertaking us in the blind spot of our trucks - we have installed the Fresnel lens, which stick on the window and can show you the blind spot as you look across.
The aim of this work is to apply this property, placing several feeders around a single Fresnel lens or reflector, to find an experimental configuration similar to the retina in human eyes, where each feeder can provide information from a different angular direction because each feeder is looking at a different area.
Though most people do not know its name, the Fresnel lens is a familiar object, a floppy or solid lens engraved with concentric circles that focus and intensifies light far more than is possible with a metal mirror, and without the great weight of a traditional lens.