File:Lentille de Fresnel (Musée national de la Marine) (15879053936).jpg

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Summary

Description

Système optique (détail) du phare d'Hourtin en Gironde qui a été en service jusqu'à la décennie 1950

La lentille de Fresnel est une lentille à échelons, composée d'une lentille centrale plan convexe et d'anneaux dioptriques superposés à cet élément et ayant leurs faces intérieures planes. L'ensemble fonctionne comme une lentille de projection de très grandes dimensions, c'est pourquoi ce type de lentille est utilisé pour les phares. Elle transforme les rayons lumineux émis par une source placée en son foyer en faisceau parallèle. (Construction, réglage et essais des instruments d'optique, par M. Lachenaud, Editeur Béranger/Dunod, 1966, Paris)


Site des musées de la Marine (sous-tutelle du ministère de la Défense)

www.musee-marine.fr/
Date
Source Lentille de Fresnel (Musée national de la Marine)
Author Jean-Pierre Dalbéra from Paris, France
Camera location48° 51′ 42.47″ N, 2° 17′ 13.96″ E Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

Licensing

w:en:Creative Commons
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This image was originally posted to Flickr by dalbera at https://www.flickr.com/photos/72746018@N00/15879053936. It was reviewed on 9 December 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

9 December 2014

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inception

28 November 2014

coordinates of the point of view

48°51'42.473"N, 2°17'13.960"E

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current15:04, 9 December 2014Thumbnail for version as of 15:04, 9 December 20141,200 × 1,200 (1.38 MB)Medium69Transferred from Flickr via Flickr2Commons

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