{"id":647,"date":"2024-05-13T09:00:00","date_gmt":"2024-05-13T07:00:00","guid":{"rendered":"https:\/\/arnaud.collignan.net\/blog\/?p=647"},"modified":"2024-05-14T09:57:53","modified_gmt":"2024-05-14T07:57:53","slug":"lentille-de-fresnel","status":"publish","type":"post","link":"https:\/\/arnaud.collignan.net\/blog\/2024\/05\/13\/lentille-de-fresnel\/","title":{"rendered":"Lentille de Fresnel"},"content":{"rendered":"\n<p>La lentille invent\u00e9e par l&#8217;ing\u00e9nieur fran\u00e7ais Augustin Fresnel est un moyen \u00e9l\u00e9gant de renvoyer \u00e0 l&#8217;horizon les rayons d&#8217;un foyer lumineux.<\/p>\n\n\n\n<p>Plut\u00f4t que d&#8217;utiliser une simple lentille plan-convexe, la lentille de Fresnel est compos\u00e9e de plusieurs anneaux concentriques de m\u00eame courbure. Cela permet d&#8217;augmenter la <strong>port\u00e9e <\/strong>du faisceau lumineux, tout en r\u00e9duisant la <strong>taille <\/strong>et le <strong>poids <\/strong>de la lentille.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"540\" height=\"360\" src=\"https:\/\/arnaud.collignan.net\/blog\/wp-content\/uploads\/2024\/05\/lighthouse-lighthouse-augustin-fresnel-1.webp\" alt=\"\" class=\"wp-image-691\" style=\"width:540px;height:auto\" srcset=\"https:\/\/arnaud.collignan.net\/blog\/wp-content\/uploads\/2024\/05\/lighthouse-lighthouse-augustin-fresnel-1.webp 540w, https:\/\/arnaud.collignan.net\/blog\/wp-content\/uploads\/2024\/05\/lighthouse-lighthouse-augustin-fresnel-1-300x200.webp 300w\" sizes=\"auto, (max-width: 540px) 100vw, 540px\" \/><figcaption class=\"wp-element-caption\">(<a href=\"https:\/\/www.boatnews.com\/story\/29002\/augustin-fresnel-and-his-lens-the-father-of-todays-headlights\">source<\/a>)<\/figcaption><\/figure>\n<\/div>\n\n\n<p>L&#8217;application initiale de ces lentilles furent les phares, et la premi\u00e8re lentille de Fresnel f\u00fbt install\u00e9e au sommet du l\u00e9gendaire phare de Cordouan, \u00e0 l&#8217;entr\u00e9e de la Gironde, non loin de <strong>Bordeaux <\/strong>! Personnellement, c&#8217;est lors de la visite de celui-ci que j&#8217;ai d\u00e9couvert cette invention.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La lentille invent\u00e9e par l&#8217;ing\u00e9nieur fran\u00e7ais Augustin Fresnel est un moyen \u00e9l\u00e9gant de renvoyer \u00e0 l&#8217;horizon les rayons d&#8217;un foyer lumineux. Plut\u00f4t que d&#8217;utiliser une&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/arnaud.collignan.net\/blog\/2024\/05\/13\/lentille-de-fresnel\/\">Lire la suite&#8230;<span class=\"screen-reader-text\">Lentille de Fresnel<\/span><\/a><\/div>\n","protected":false},"author":1,"featured_media":694,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[56,114,63],"class_list":["post-647","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-physique","tag-histoire","tag-optique","tag-visite","entry"],"acf":{"auteur_de_limage":"Arnaud C.","url_de_lauteur_de_limage":"https:\/\/arnaud.collignan.net\/","source":"Phare de Courdouan","url_de_la_source":"https:\/\/www.phare-de-cordouan.fr\/","bibliographie":"","url_de_la_bibliographie":""},"_links":{"self":[{"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/posts\/647","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/comments?post=647"}],"version-history":[{"count":3,"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/posts\/647\/revisions"}],"predecessor-version":[{"id":693,"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/posts\/647\/revisions\/693"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/media\/694"}],"wp:attachment":[{"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/media?parent=647"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/categories?post=647"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/arnaud.collignan.net\/blog\/wp-json\/wp\/v2\/tags?post=647"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}