{"id":9966,"date":"2021-02-05T11:51:35","date_gmt":"2021-02-05T10:51:35","guid":{"rendered":"https:\/\/www.yellowscan.com\/knowledge\/quels-sont-les-differents-modeles-de-balayage-des-systemes-lidar\/"},"modified":"2025-05-07T15:17:45","modified_gmt":"2025-05-07T13:17:45","slug":"what-are-the-different-scan-patterns-of-lidar-systems","status":"publish","type":"ys_knowledge","link":"https:\/\/www.yellowscan.com\/fr\/knowledge\/what-are-the-different-scan-patterns-of-lidar-systems\/","title":{"rendered":"Mod\u00e8les de balayage LiDAR : prismes, r\u00e9seaux, miroirs"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"9966\" class=\"elementor elementor-9966 elementor-1339\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7e58697 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7e58697\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-12268d4\" data-id=\"12268d4\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d3c18f4 elementor-widget elementor-widget-text-editor\" data-id=\"d3c18f4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Le saviez-vous ?<\/h2>\n<h4>Les syst\u00e8mes LiDAR pr\u00e9sentent diff\u00e9rents sch\u00e9mas de balayage en fonction de la m\u00e9thode de balayage utilis\u00e9e.<\/h4>\n<p>Vous savez peut-\u00eatre comment <a href=\"https:\/\/www.yellowscan.com\/knowledge\/how-does-lidar-work\/\">fonctionne<\/a> un <a href=\"https:\/\/www.yellowscan.com\/knowledge\/how-does-lidar-work\/\">syst\u00e8me LiDAR<\/a>: il mesure le temps de parcours entre l&rsquo;\u00e9mission d&rsquo;une impulsion laser et la r\u00e9ception du signal r\u00e9fl\u00e9chi par une cible.<\/p>\n<p>Mais vous \u00eates-vous d\u00e9j\u00e0 demand\u00e9 quel type de trajectoire le laser balaie au sol ?<\/p>\n<p>Les scanners laser peuvent \u00eatre rotatifs ou non, et utiliser diff\u00e9rents \u00e9l\u00e9ments de d\u00e9viation optique tels que des prismes, des r\u00e9seaux et des miroirs pour cr\u00e9er des mod\u00e8les de balayage sp\u00e9cifiques.<\/p>\n<p><strong>Le miroir oscillant<\/strong> (figure 1.a)<\/p>\n<p>Des lasers utilisant des miroirs oscillants dirigent les impulsions laser dans deux directions de l&rsquo;andain, cr\u00e9ant un motif dentel\u00e9 sur le sol (figure 2.a). La largeur de la fauch\u00e9e est donn\u00e9e par l&rsquo;angle d&rsquo;inclinaison maximal du miroir. La densit\u00e9 de points obtenue n&rsquo;est pas uniforme car les impulsions laser ont tendance \u00e0 s&rsquo;accumuler sur les bords de la fauch\u00e9e en raison de la d\u00e9c\u00e9l\u00e9ration du miroir.<\/p>\n<p><strong>Le miroir polygonal rotatif<\/strong> (figure 1.b)<\/p>\n<p>Ce syst\u00e8me cr\u00e9e un mod\u00e8le de balayage compos\u00e9 de lignes parall\u00e8les obliques par rapport \u00e0 la direction de la progression de la plate-forme (figure 2.b). Le balayage se fait toujours dans la m\u00eame direction. La fauch\u00e9e d\u00e9pend de la largeur de la face polygonale du miroir.<\/p>\n<p><strong>Le miroir rotatif<\/strong> (figure 1.c)<\/p>\n<p>Avec son axe de rotation colin\u00e9aire \u00e0 la direction du faisceau laser \u00e9mis par la source, le miroir rotatif permet un balayage sur pr\u00e8s de 360\u00b0. Comme dans l&rsquo;exemple pr\u00e9c\u00e9dent, le mod\u00e8le de balayage est compos\u00e9 de lignes parall\u00e8les obliques par rapport \u00e0 la direction du mouvement du syst\u00e8me (figure 2.c). Cette fois, la taille de la fauch\u00e9e d\u00e9pend de la port\u00e9e maximale du syst\u00e8me LiDAR.<\/p>\n<p><strong>Les prismes ou r\u00e9seaux dispersifs<\/strong> (figure 1.d)<\/p>\n<p>Les prismes dispersifs et les r\u00e9seaux dispersifs tournent autour du m\u00eame axe pour g\u00e9n\u00e9rer des motifs de balayage en forme de roses. Par exemple, les prismes de Risley &#8211; \u00e9galement appel\u00e9s prismes en coin &#8211; peuvent produire des cercles (figure 2.d) ou des motifs de balayage en forme de roses (figure 3).<\/p>\n<p>L&rsquo;avantage de ces motifs est qu&rsquo;ils ne se r\u00e9p\u00e8tent pas, de sorte que m\u00eame en situation statique, le taux de couverture augmente avec le temps, ce qui permet de d\u00e9tecter davantage de d\u00e9tails dans le champ de vision du capteur. La taille de la fauch\u00e9e d\u00e9pend de la configuration et de l&rsquo;inclinaison de chaque prisme en coin.<\/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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3d4c392 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3d4c392\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-c6c003f\" data-id=\"c6c003f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-27d6e56 elementor-widget elementor-widget-image\" data-id=\"27d6e56\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"342\" src=\"https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/lasers-1024x342.jpg\" class=\"attachment-large size-large wp-image-1344\" alt=\"\" srcset=\"https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/lasers-1024x342.jpg 1024w, https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/lasers-300x100.jpg 300w, https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/lasers-768x257.jpg 768w, https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/lasers.jpg 1352w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 1 - Diff\u00e9rents m\u00e9canismes de balayage : (a) miroir oscillant ; (b) miroir polygonal rotatif ; (c) miroir rotatif ; (d) prisme \u00e0 coin rotatif ; (e) deux prismes \u00e0 coins rotatifs. Q. P\u00e9ntek, Contribution \u00e0 la g\u00e9n\u00e9ration de cartes couleur 3D d'environnements naturels \u00e0 partir de donn\u00e9es issues d'un syst\u00e8me multi-capteurs pour drone, th\u00e8se de doctorat, 2020.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7b90029 elementor-widget elementor-widget-spacer\" data-id=\"7b90029\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-648933c elementor-widget elementor-widget-text-editor\" data-id=\"648933c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.theses.fr\/2020MONTS037\" target=\"_blank\" rel=\"noopener\">Q. P\u00e9ntek, Contribution \u00e0 la g\u00e9n\u00e9ration de cartes couleur 3D d&rsquo;environnements naturels \u00e0 partir de donn\u00e9es issues d&rsquo;un syst\u00e8me multi-capteurs pour drone, th\u00e8se de doctorat, 2020.<\/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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-020f1f8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"020f1f8\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5e85fd0\" data-id=\"5e85fd0\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9844a58 elementor-widget elementor-widget-image\" data-id=\"9844a58\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"720\" src=\"https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/scan_pattern_f-1024x720.png\" class=\"attachment-large size-large wp-image-1342\" alt=\"\" srcset=\"https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/scan_pattern_f-1024x720.png 1024w, https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/scan_pattern_f-300x211.png 300w, https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/scan_pattern_f-768x540.png 768w, https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/scan_pattern_f.png 1446w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 2 - Diff\u00e9rents mod\u00e8les de balayage ; (a) Mod\u00e8le g\u00e9n\u00e9r\u00e9 par un miroir oscillant ; (b) sch\u00e9ma g\u00e9n\u00e9r\u00e9 par un miroir polygonal tournant ; (c) mod\u00e8le g\u00e9n\u00e9r\u00e9 par un miroir rotatif ; (d) mod\u00e8le g\u00e9n\u00e9r\u00e9 par un prisme en coin rotatif.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9171c2b elementor-widget elementor-widget-spacer\" data-id=\"9171c2b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e55637e elementor-widget elementor-widget-text-editor\" data-id=\"e55637e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.theses.fr\/2020MONTS037\" target=\"_blank\" rel=\"noopener\">Q. P\u00e9ntek, Contribution \u00e0 la g\u00e9n\u00e9ration de cartes couleur 3D d&rsquo;environnements naturels \u00e0 partir de donn\u00e9es issues d&rsquo;un syst\u00e8me multi-capteurs pour drone, th\u00e8se de doctorat, 2020.<\/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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f5595e6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f5595e6\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ce9e272\" data-id=\"ce9e272\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0c5e4fd elementor-widget elementor-widget-image\" data-id=\"0c5e4fd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"252\" src=\"https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/livox-1024x252.jpg\" class=\"attachment-large size-large wp-image-1346\" alt=\"\" srcset=\"https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/livox-1024x252.jpg 1024w, https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/livox-300x74.jpg 300w, https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/livox-768x189.jpg 768w, https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/livox-1536x378.jpg 1536w, https:\/\/www.yellowscan.com\/wp-content\/uploads\/2022\/08\/livox.jpg 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 3 - Nuages de points Livox Mid-40 qui s'accumulent au fil du temps. Illustration tir\u00e9e du manuel d'utilisation du fabricant.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4133325 elementor-widget elementor-widget-spacer\" data-id=\"4133325\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9d8704a elementor-widget elementor-widget-text-editor\" data-id=\"9d8704a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/msadowski.github.io\/livox-mid40-review\/\" target=\"_blank\" rel=\"noopener\">M. Sadowski, Livox Mid-40 LiDAR review, msadowski blog, 15 f\u00e9vrier 2019<\/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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3cce9eb elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3cce9eb\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-63eb4c3\" data-id=\"63eb4c3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4a91ea8 elementor-widget elementor-widget-text-editor\" data-id=\"4a91ea8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em>N.B. Auteur L\u00e9a Moussy &#8211; Le contenu de cet article est prot\u00e9g\u00e9 par le droit d&rsquo;auteur.<\/em><\/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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7717ef93 el-cta elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7717ef93\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1a02a44e\" data-id=\"1a02a44e\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-257513fc elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"257513fc\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-20470279\" data-id=\"20470279\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6b9ff0da elementor-widget elementor-widget-text-editor\" data-id=\"6b9ff0da\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4>D\u00e9couvrez nos solutions UAV 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<div class=\"elementor-column 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