{"id":405104,"date":"2022-11-15T11:51:41","date_gmt":"2022-11-15T10:51:41","guid":{"rendered":"https:\/\/www.eenewseurope.com\/?p=405104"},"modified":"2022-11-15T23:41:19","modified_gmt":"2022-11-15T22:41:19","slug":"les-micro-miroirs-mems-aiguisent-la-vue-du-lidar-automobile","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/les-micro-miroirs-mems-aiguisent-la-vue-du-lidar-automobile\/","title":{"rendered":"Les micro-miroirs MEMS aiguisent la vue du Lidar automobile"},"content":{"rendered":"<p><strong>Des micro-miroirs MEMS pour Lidar automobile visant \u00e0 d\u00e9tecter un pneu automobile (15 cm de haut) \u00e0 100 m\u00e8tres de distance\u00a0: c&rsquo;est le r\u00e9sultat obtenu par le CEA-Leti dans le cadre du projet europ\u00e9en Vizta. Il a donn\u00e9 lieu \u00e0 trois brevets.<\/strong><\/p>\n<p>Les micro-miroirs MEMS d\u2019un Lidar automobile sont des composants miniaturis\u00e9s (2 mm de diam\u00e8tre) mais strat\u00e9giques : ils r\u00e9fl\u00e9chissent le faisceau laser et gr\u00e2ce \u00e0 leurs mouvements de haut en bas et de droite \u00e0 gauche, l\u2019orientent pour balayer une sc\u00e8ne. Les v\u00e9hicules, pi\u00e9tons, obstacles peuvent ainsi \u00eatre d\u00e9tect\u00e9s.<\/p>\n<h3>Des micro-miroirs moins co\u00fbteux, un Lidar \u00e0 plus longue port\u00e9e<\/h3>\n<p>Les innovations d\u00e9velopp\u00e9es par le Leti et couvertes par trois brevets augmentent la port\u00e9e et la s\u00e9curit\u00e9 du Lidar, r\u00e9duisent la consommation et diminuent le co\u00fbt de fabrication.\u00a0Pour d\u00e9placer les micro-miroirs, les chercheurs ont remplac\u00e9 les traditionnelles solutions (\u00e9lectrostatique ou \u00e9lectromagn\u00e9tique) par des actionneurs pi\u00e9zo-\u00e9lectriques \u00e0 base de PZT. Ces derniers ne n\u00e9cessitent qu\u2019une tension de polarisation de 20 V, contre 150 V pour un miroir \u00e9lectrostatique, et ne requi\u00e8rent pas d\u2019aimants volumineux comme pour un miroir \u00e9lectromagn\u00e9tique.\u00a0<\/p>\n<h3>Fabrication collective par proc\u00e9d\u00e9s d\u2019int\u00e9gration \u00e0 tr\u00e8s grande \u00e9chelle (VLSI) compatibles CMOS<\/h3>\n<p>De plus, ces micro-miroirs ont \u00e9t\u00e9 con\u00e7us pour fonctionner \u00e0 1550 nm afin de limiter le risque oculaire, et supportent un faisceau laser incident de haute puissance, n\u00e9cessaire pour des applications Lidar longue port\u00e9e.\u00a0 Pour ce faire, le mat\u00e9riau r\u00e9flecteur, classiquement r\u00e9alis\u00e9 en or, laisse place \u00e0 des couches de Bragg d\u00e9pos\u00e9es sur silicium, avec un double avantage. Primo, elles sont 4 fois moins absorbantes et s\u2019\u00e9chauffent donc moins sous l\u2019effet du laser, ce qui permet d\u2019augmenter la puissance incidente. Deuxio ces couches peuvent \u00eatre r\u00e9alis\u00e9es avec des proc\u00e9d\u00e9s collectifs compatibles CMOS, \u00e0 moindre co\u00fbt.\u00a0<\/p>\n<h3>D\u00e9j\u00e0 des tests industriels<\/h3>\n<p>Enfin, pour renforcer la s\u00e9curit\u00e9 oculaire des pi\u00e9tons, les chercheurs ont ajout\u00e9 une fonction d\u2019autodiagnostic : le laser s\u2019\u00e9teint quand le miroir n\u2019est plus en mouvement.\u00a0Les travaux men\u00e9s dans le cadre de Vizta comprennent \u00e9galement un banc optique de caract\u00e9risation, un packaging et une interface \u00e9lectronique de pilotage d\u00e9di\u00e9es. Les miroirs ont \u00e9t\u00e9 int\u00e9gr\u00e9s dans le syst\u00e8me Lidar 3D d\u2019un partenaire industriel ; leur compatibilit\u00e9 avec l\u2019application vis\u00e9e a \u00e9t\u00e9 valid\u00e9e. \u00c0 terme, l\u2019\u00e9lectronique de contr\u00f4le du miroir \u00e9voluera pour scanner ou pointer plus finement une zone sp\u00e9cifique de la sc\u00e8ne.<\/p>\n<p><a href=\"https:\/\/www.leti-cea.fr\/cea-tech\/leti\">CEA Leti<\/a><\/p>\n<p><a href=\"https:\/\/www.vizta-ecsel.eu\/\">En savoir plus sur Vizra<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Des micro-miroirs MEMS pour Lidar automobile visant \u00e0 d\u00e9tecter un pneu automobile (15 cm de haut) \u00e0 100 m\u00e8tres de distance\u00a0: c&rsquo;est le r\u00e9sultat obtenu par le CEA-Leti dans le cadre du projet europ\u00e9en Vizta. Il a donn\u00e9 lieu \u00e0 trois brevets. Les micro-miroirs MEMS d\u2019un Lidar automobile sont des composants miniaturis\u00e9s (2 mm de [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":405216,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[1640,2215,2224],"domains":[47],"ppma_author":[2223],"class_list":["post-405104","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","tag-automobile","tag-lidar-fr","tag-mems-fr","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Les micro-miroirs MEMS aiguisent la vue du Lidar automobile ...<\/title>\n<meta name=\"description\" content=\"Des micro-miroirs MEMS pour Lidar automobile visant \u00e0 d\u00e9tecter un pneu automobile (15 cm de haut) \u00e0 100 m\u00e8tres de distance\u00a0: c&rsquo;est le r\u00e9sultat...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ecinews.fr\/fr\/wp-json\/wp\/v2\/posts\/405104\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les micro-miroirs MEMS aiguisent la vue du Lidar automobile\" \/>\n<meta property=\"og:description\" content=\"Des micro-miroirs MEMS pour Lidar automobile visant \u00e0 d\u00e9tecter un pneu automobile (15 cm de haut) \u00e0 100 m\u00e8tres de distance\u00a0: c&rsquo;est le r\u00e9sultat obtenu par le CEA-Leti dans le cadre du projet europ\u00e9en Vizta. 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