{"id":10028,"date":"2020-07-21T09:16:44","date_gmt":"2020-07-21T07:16:44","guid":{"rendered":"https:\/\/www.yellowscan.com\/knowledge\/pourquoi-le-lidar-a-t-il-une-longueur-donde-specifique-partie-2\/"},"modified":"2025-05-14T10:55:31","modified_gmt":"2025-05-14T08:55:31","slug":"why-does-lidar-have-a-specific-wavelength-2","status":"publish","type":"ys_knowledge","link":"https:\/\/www.yellowscan.com\/fr\/knowledge\/why-does-lidar-have-a-specific-wavelength-2\/","title":{"rendered":"Pourquoi le LiDAR a-t-il une longueur d’onde sp\u00e9cifique ? Partie 2"},"content":{"rendered":"\t\t
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Autre sp\u00e9cificit\u00e9 de la longueur d’onde LiDAR : l’absorption atmosph\u00e9rique.<\/h3>\n

Un rayon de soleil \u00e9met jusqu’\u00e0 150K lux. C’est comme recevoir la lumi\u00e8re de 15 000 bougies en m\u00eame temps.<\/p>\n

Une image directe ou r\u00e9fl\u00e9chie peut \u00eatre mal interpr\u00e9t\u00e9e par le LiDAR et \u00eatre consid\u00e9r\u00e9e comme un retour laser. Les mol\u00e9cules d’eau pr\u00e9sentes dans l’atmosph\u00e8re absorbent une bonne partie du rayonnement solaire, r\u00e9duisant ainsi les chances que le rayon solaire atteigne le capteur LiDAR.<\/p>\n

Nos syst\u00e8mes LiDAR<\/strong> utilisent des longueurs d’onde<\/strong> sp\u00e9ciales : 903 nm et 905 nm. Comment cela se fait-il ?<\/p>\n

La lumi\u00e8re qui nous parvient du soleil traverse l’atmosph\u00e8re, qui absorbe une partie des radiations. L’eau, constamment pr\u00e9sente dans l’air, absorbe ces radiations. On observe qu’une tr\u00e8s petite partie du rayonnement solaire de 905 nm est pr\u00e9sente dans l’atmosph\u00e8re car elle est principalement absorb\u00e9e par la vapeur d’eau.<\/p>\n

En outre, un filtre \u00e0 bande passante \u00e9troite est plac\u00e9 devant le capteur LiDAR. Ainsi, seule une longueur d’onde s\u00e9lectionn\u00e9e de quelques nanom\u00e8tres autour de la longueur d’onde centrale du filtre peut passer \u00e0 travers celui-ci. En d’autres termes, il filtre toute la lumi\u00e8re du soleil qui pourrait g\u00e9n\u00e9rer des donn\u00e9es erron\u00e9es (c’est-\u00e0-dire du bruit). Cela permet d’optimiser le fait que la lumi\u00e8re captur\u00e9e et enregistr\u00e9e par le LiDAR correspond \u00e0 la lumi\u00e8re qu’il a lui-m\u00eame g\u00e9n\u00e9r\u00e9e.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Sources : NASA (original) ; SVG par Mysid<\/a>. – Vectoris\u00e9 par l’utilisateur:Mysid<\/a> dans Inkscape, image originale de la NASA tir\u00e9e de File:Atmospheric electromagnetic<\/a><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\u00c0 titre d’information compl\u00e9mentaire, vous pouvez lire
\n l’impact de l’efficacit\u00e9 des d\u00e9tecteurs sur la longueur d’onde LiDAR.<\/strong>
\n<\/a><\/div>\n<\/p>\n

N.B. Auteur L\u00e9a Moussi. Le contenu de cet article est prot\u00e9g\u00e9 par le droit d’auteur.<\/em><\/p><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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D\u00e9couvrez nos solutions LiDAR<\/h4>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tEn savoir plus<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"featured_media":2909,"menu_order":290,"template":"","meta":{"_acf_changed":false,"content-type":""},"categories":[29],"class_list":["post-10028","ys_knowledge","type-ys_knowledge","status-publish","has-post-thumbnail","hentry","category-article"],"acf":[],"yoast_head":"\nPourquoi le LiDAR utilise-t-il 903 et 905 nm ?<\/title>\n<meta name=\"description\" content=\"Autre sp\u00e9cificit\u00e9 de la longueur d'onde LiDAR : l'absorption atmosph\u00e9rique. Nos syst\u00e8mes LiDAR utilisent des longueurs d'onde sp\u00e9ciales : 903 nm et 905 nm. 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