{"id":9901,"date":"2019-01-04T01:38:06","date_gmt":"2019-01-04T01:38:06","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9901"},"modified":"2019-01-14T19:38:35","modified_gmt":"2019-01-14T19:38:35","slug":"pourquoi-utiliser-un-pointeur-laser-en-astronomie","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/01\/04\/pourquoi-utiliser-un-pointeur-laser-en-astronomie\/","title":{"rendered":"Pourquoi utiliser un pointeur laser en astronomie ?"},"content":{"rendered":"<p><strong>Son faisceau vert dirig\u00e9 vers le ciel accompagne d\u00e9sormais les soir\u00e9es astronomiques. Zoom sur le pointeur laser, un outil p\u00e9dagogique mais dangereux.<\/strong><\/p>\n<p>Si vous avez d\u00e9j\u00e0 particip\u00e9 \u00e0 une veill\u00e9e en compagnie d&#8217;astronomes amateurs (par exemple \u00e0 l&#8217;occasion des traditionnelles <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/07\/29\/nuits-etoiles-grande-foule-a-dijon\/\" target=\"_blank\" rel=\"noopener\">Nuits des \u00e9toiles<\/a>), vous avez sans doute vu un animateur utiliser un pointeur laser vert (c&#8217;est la couleur qui a le meilleur indice de persistance r\u00e9tinienne) pour accompagner ses explications. Avec ce petit faisceau parfaitement visible la nuit, il est en effet d\u00e9sormais tr\u00e8s facile de montrer aux novices un astre en particulier ou de simuler la forme d&#8217;une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/11\/14\/la-constellation-orion-surplombe-le-sud-avant-aube\/\" target=\"_blank\" rel=\"noopener\">constellation<\/a> ; un outil p\u00e9dagogique tr\u00e8s appr\u00e9ci\u00e9 par tous ceux qui sensibilisent le public aux beaut\u00e9s du ciel nocturne.<\/p>\n<figure id=\"attachment_9902\" aria-describedby=\"caption-attachment-9902\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/voilactee.jpg\" rel=\"lightbox[9901]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-9902\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/voilactee-450x279.jpg\" alt=\"\" width=\"450\" height=\"279\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/voilactee-450x279.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/voilactee-768x476.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/voilactee-1024x635.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/voilactee.jpg 1450w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-9902\" class=\"wp-caption-text\">Le pointeur laser est un merveilleux outil p\u00e9dagogique pour indiquer une zone du ciel nocturne mais son usage n\u00e9cessite quelques pr\u00e9cautions. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Pour autant le pointeur laser ne doit pas \u00eatre laiss\u00e9 entre toutes les mains en raison de sa dangerosit\u00e9 ; petit rappel concernant la r\u00e9glementation actuelle et les r\u00e8gles de prudence qu&#8217;impose son utilisation.\u00a0<!--more--><\/p>\n<p>Rappelons d&#8217;abord le principe d&#8217;un laser : acronyme de\u00a0l&#8217;anglais <em>Light Amplification by Stimulated Emission of Radiation<\/em>, le laser est un dispositif qui permet aux photons de se propager en phase et non arbitrairement comme c&#8217;est le cas dans une source lumineuse classique. On obtient alors un faisceau lumineux \u00e9troit extr\u00eamement directionnel.<\/p>\n<p>La r\u00e9glementation fran\u00e7aise classe les lasers en cinq cat\u00e9gories :<\/p>\n<ul>\n<li>ceux (sans danger) que l&#8217;on trouve dans les imprimantes ou les lecteurs CD constituent la classe 1<\/li>\n<li>ceux d\u2019une puissance inf\u00e9rieure ou \u00e9gale \u00e0 1 mW dont la longueur d&#8217;onde varie de 400 \u00e0 700 nm sont regroup\u00e9s dans la classe 2<\/li>\n<li>ceux dont la puissance est comprise entre 1 et 5 mW forment la classe 3A<\/li>\n<li>ceux dont la puissance est comprise entre 5 et 500 mW forment la classe 3B<\/li>\n<li>tous ceux qui sont plus puissants constituent la classe 4<\/li>\n<\/ul>\n<p>En raison de la puissance de leur faisceau, les lasers de classe 3B sont les mieux adapt\u00e9s pour montrer les beaut\u00e9s du ciel nocturne ; <strong>selon le d\u00e9cret n\u00b0 2012-1303 du 26 novembre 2012 leur emploi est autoris\u00e9 uniquement dans le cadre d&#8217;une d\u00e9marche scientifique destin\u00e9e \u00e0 am\u00e9liorer les connaissances, ce qui est le cas des animations en astronomie<\/strong>.<\/p>\n<p>Tout animateur \u00e9quip\u00e9 d&#8217;un tel instrument est le seul habilit\u00e9 \u00e0 l&#8217;utiliser ; il ne doit bien entendu jamais diriger le faisceau de son pointeur en direction d&#8217;une personne, d&#8217;un animal, d&#8217;un avion&#8230; ni le laisser en libre acc\u00e8s ; en le tenant avec le bras tendu vers le ciel, il sera certain que personne ne viendra se mettre en danger en coupant le rayon lumineux. Ces quelques r\u00e8gles \u00e9l\u00e9mentaires de prudence respect\u00e9es, il pourra continuer \u00e0 partager sa passion !<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Son faisceau vert dirig\u00e9 vers le ciel accompagne d\u00e9sormais les soir\u00e9es astronomiques. Zoom sur le pointeur laser, un outil p\u00e9dagogique mais dangereux. Si vous avez d\u00e9j\u00e0 particip\u00e9 \u00e0 une veill\u00e9e en compagnie d&#8217;astronomes amateurs (par exemple \u00e0 l&#8217;occasion des traditionnelles Nuits des \u00e9toiles), vous avez sans doute vu un animateur utiliser un pointeur laser vert &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/01\/04\/pourquoi-utiliser-un-pointeur-laser-en-astronomie\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Pourquoi utiliser un pointeur laser en astronomie ?<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":9902,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[2599],"class_list":["post-9901","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-pointeur-laser"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Pourquoi utiliser un pointeur laser en astronomie ?<\/title>\n<meta name=\"description\" content=\"Son faisceau vert dirig\u00e9 vers le ciel accompagne d\u00e9sormais les soir\u00e9es astronomiques. 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