{"id":74514,"date":"2025-06-30T15:45:52","date_gmt":"2025-06-30T13:45:52","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=74514"},"modified":"2025-07-02T08:45:22","modified_gmt":"2025-07-02T06:45:22","slug":"cleardrop-quand-les-ultrasons-transforment-les-optiques-en-surfaces-autonettoyantes","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/newsletter\/cleardrop-quand-les-ultrasons-transforment-les-optiques-en-surfaces-autonettoyantes.html","title":{"rendered":"Cleardrop : quand les ultrasons transforment les optiques en surfaces autonettoyantes"},"content":{"rendered":"<div  class='flex_column av-37avgsy-0d9504ce59532ccd4a7dbbe9019ea900 av_one_full  avia-builder-el-0  el_before_av_one_full  avia-builder-el-first  first flex_column_div'     ><section  class='av_textblock_section av-mcj3sznm-aae2c58783ee23e882349930f6048864'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/cleardrop.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-74515 aligncenter\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/cleardrop.jpg\" alt=\"\" width=\"350\" height=\"133\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/cleardrop.jpg 350w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/cleardrop-300x114.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/cleardrop-18x7.jpg 18w\" sizes=\"auto, (max-width: 350px) 100vw, 350px\" \/><\/a><\/p>\n<\/div><\/section><\/div>\n<div  class='flex_column av-2jpe6vm-26161ff44249b0a3503a5636ce04d089 av_one_full  avia-builder-el-2  el_after_av_one_full  el_before_av_one_fourth  first flex_column_div  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mcj3uy6t-360262317894c738119f6d8a3f3468b8\">\n#top .av-special-heading.av-mcj3uy6t-360262317894c738119f6d8a3f3468b8{\npadding-bottom:10px;\ncolor:#3966c6;\n}\nbody .av-special-heading.av-mcj3uy6t-360262317894c738119f6d8a3f3468b8 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mcj3uy6t-360262317894c738119f6d8a3f3468b8 .special-heading-inner-border{\nborder-color:#3966c6;\n}\n.av-special-heading.av-mcj3uy6t-360262317894c738119f6d8a3f3468b8 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mcj3uy6t-360262317894c738119f6d8a3f3468b8 av-special-heading-h1 custom-color-heading  avia-builder-el-3  avia-builder-el-no-sibling'><h1 class='av-special-heading-tag'  itemprop=\"headline\"  >Cleardrop : quand les ultrasons transforment les optiques en surfaces autonettoyantes<\/h1><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><\/div>\n<div  class='flex_column av-w84ppu-828ed77ce224812119062ab5b38fe2ee av_one_fourth  avia-builder-el-4  el_after_av_one_full  el_before_av_three_fifth  first flex_column_div  column-top-margin'     ><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1xnrdhu-d4540d284667c04639aab158c79f3c20\">\n.flex_column.av-1xnrdhu-d4540d284667c04639aab158c79f3c20{\nborder-radius:15px 15px 15px 15px;\n}\n<\/style>\n<div  class='flex_column av-1xnrdhu-d4540d284667c04639aab158c79f3c20 av_three_fifth  avia-builder-el-5  el_after_av_one_fourth  el_before_av_one_half  flex_column_div  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1qd2xea-618116798e9668e28d25419607c43464\">\n#top .av_textblock_section.av-1qd2xea-618116798e9668e28d25419607c43464 .avia_textblock{\nfont-size:15px;\ncolor:#177ce8;\ntext-align:justify;\n}\n<\/style>\n<section  class='av_textblock_section av-1qd2xea-618116798e9668e28d25419607c43464'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock custom-quote invalid-custom-class-found position relative font-style italic padding em em margin em invalid-custom-class-found background-color f9f9f9 border-left px solid ccc font-size em color invalid-custom-class-found invalid-custom-class-found custom-quotebefore invalid-custom-class-found content invalid-custom-class-found font-size em position absolute top px left px color ccc line-height invalid-custom-class-found font-family Georgia serif invalid-custom-class-found av_inherit_color'  itemprop=\"text\" ><p><strong><span style=\"color: #999999;\">\u00ab Maintenir une visibilit\u00e9 parfaite quelles que soient les conditions m\u00e9t\u00e9orologiques est indispensable pour de nombreuses applications allant des cam\u00e9ras de surveillance, aux syst\u00e8mes autonomes tels que les drones ou encore les panneaux solaires qui peuvent perdre jusqu\u2019\u00e0 50% de leur rendement lorsqu\u2019ils ne sont pas nettoy\u00e9s r\u00e9guli\u00e8rement. Pour r\u00e9pondre \u00e0 ce d\u00e9fi, VISION, une spin-off de l\u2019IEMN, a d\u00e9velopp\u00e9<\/span><\/strong><strong><span style=\"color: #999999;\">\u00a0une technologie int\u00e9gr\u00e9e de nettoyage de surfaces optiques bas\u00e9e sur des ondes ultrasonores de surface.\u00bb<\/span><\/strong><\/p>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1pd6hma-8ac581f9eedb750f9a880212e5e1c1b7\">\n@keyframes av_boxShadowEffect_av-1pd6hma-8ac581f9eedb750f9a880212e5e1c1b7-column {\n0%   { box-shadow:  0 0 0 0 #d3d3d3; opacity: 1; }\n100% { box-shadow:  0 0 10px 0 #d3d3d3; opacity: 1; }\n}\n.flex_column.av-1pd6hma-8ac581f9eedb750f9a880212e5e1c1b7{\nbox-shadow: 0 0 10px 0 #d3d3d3;\nborder-width:2px;\nborder-color:#eaeaea;\nborder-style:solid;\nborder-radius:15px 15px 15px 15px;\npadding:15px 15px 15px 15px;\n}\n<\/style>\n<div  class='flex_column av-1pd6hma-8ac581f9eedb750f9a880212e5e1c1b7 av_one_half  avia-builder-el-7  el_after_av_three_fifth  el_before_av_one_half  first flex_column_div shadow-not-animated'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mcj4lrwd-6dcaf8623e0b93537aff7473b4effbdb\">\n#top .av_textblock_section.av-mcj4lrwd-6dcaf8623e0b93537aff7473b4effbdb .avia_textblock{\ntext-align:justify;\n}\n<\/style>\n<section  class='av_textblock_section av-mcj4lrwd-6dcaf8623e0b93537aff7473b4effbdb'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p>La technologie Cleardrop, d\u00e9velopp\u00e9e et brevet\u00e9e dans le cadre d\u2019un partenariat entre la startup VISION et les chercheurs de l\u2019IEMN, repose sur l\u2019utilisation d\u2019ondes acoustiques de surface pour nettoyer tous types de pollutions (gouttes, particules solides, neige, givre, boue) pr\u00e9sentes sur des surfaces optiques.<\/p>\n<p>Physiquement, des \u00ab nano-tremblements \u00bb de terre sont g\u00e9n\u00e9r\u00e9s par des actionneurs pi\u00e9zo\u00e9lectriques \u00e0 la surface d\u2019un substrat. Ces vibrations, appel\u00e9es ondes de Rayleigh, sont de tr\u00e8s faible amplitude (de l\u2019ordre du picom\u00e8tre ou du nanom\u00e8tre) et de fr\u00e9quence tr\u00e8s \u00e9lev\u00e9e (plusieurs millions de vibrations par seconde), ce qui les rend invisibles \u00e0 l\u2019oeil nu. Leur \u00e9nergie reste localis\u00e9e \u00e0 la surface, ce qui permet une transmission tr\u00e8s efficace aux inclusions liquides ou solides pr\u00e9sentes. Dans le cas des inclusions liquides, les ondes se propagent \u00e0 l\u2019int\u00e9rieur de la goutte selon un angle d\u00e9termin\u00e9 par la loi de Snell-Descartes.<\/p>\n<p>Ce rayonnement g\u00e9n\u00e8re (i) un \u00e9coulement interne appel\u00e9 \u00ab streaming \u00bb, et (ii) une force dite\u00ab force de radiation acoustique \u00bb, qui contribuent ensemble \u00e0 d\u00e9former asym\u00e9triquement la goutte et \u00e0 induire son d\u00e9placement dans le sens de propagation de l\u2019onde. Dans le cas des particules solides, celles-ci sont acc\u00e9l\u00e9r\u00e9es par la d\u00e9formation elliptique de la surface, provoquant des sauts des particules dans le sens oppos\u00e9 \u00e0 la propagation de l\u2019onde.<\/p>\n<p>Les particules solides se d\u00e9placent donc dans le sens inverse de la propagation des ondes. Il est ainsi possible, gr\u00e2ce \u00e0 ces m\u00e9canismes, de nettoyer tout type d\u2019inclusion pr\u00e9sente sur une surface optique en moins d\u2019une seconde. Le travail de la soci\u00e9t\u00e9 Cleardrop r\u00e9alis\u00e9 a consist\u00e9 \u00e0 rendre cette technologie, initialement d\u00e9velopp\u00e9e en laboratoire sur des substrats pi\u00e9zo\u00e9lectriques, fonctionnelle sur tout type de surface optique.<\/p>\n<p><a href=\"https:\/\/clearsolar.tech\/\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-74553\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/solar.jpg\" alt=\"\" width=\"200\" height=\"62\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/solar.jpg 449w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/solar-300x94.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/solar-18x6.jpg 18w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/a><a href=\"https:\/\/cleardrop.tech\/\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-74551 alignnone\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/cleardrop-1.jpg\" alt=\"\" width=\"210\" height=\"80\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/cleardrop-1.jpg 350w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/cleardrop-1-300x114.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/cleardrop-1-18x7.jpg 18w\" sizes=\"auto, (max-width: 210px) 100vw, 210px\" \/><\/a><\/p>\n<p style=\"text-align: left;\">Contact: <a href=\"mailto:michael.baudoin@univ-lille.fr\" target=\"_blank\" rel=\"noopener\">michael.baudoin@univ-lille.fr<\/a><\/p>\n<\/div><\/section><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-11bv302-6d7541f368c51f1b62ae3082675709b4\">\n@keyframes av_boxShadowEffect_av-11bv302-6d7541f368c51f1b62ae3082675709b4-column {\n0%   { box-shadow:  0 0 0 0 #d6d6d6; opacity: 1; }\n100% { box-shadow:  0 0 10px 0 #d6d6d6; opacity: 1; }\n}\n.flex_column.av-11bv302-6d7541f368c51f1b62ae3082675709b4{\nbox-shadow: 0 0 10px 0 #d6d6d6;\nborder-radius:15px 15px 15px 15px;\npadding:15px 15px 15px 15px;\n}\n<\/style>\n<div  class='flex_column av-11bv302-6d7541f368c51f1b62ae3082675709b4 av_one_half  avia-builder-el-9  el_after_av_one_half  el_before_av_hr  flex_column_div shadow-not-animated'     ><section  class='av_textblock_section av-23li5u-ed136d8240baffe481b0e2bd16958955'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/CleardropV2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-74523 aligncenter\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/CleardropV2.jpg\" alt=\"\" width=\"439\" height=\"426\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/CleardropV2.jpg 439w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/CleardropV2-300x291.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/CleardropV2-12x12.jpg 12w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/CleardropV2-36x36.jpg 36w\" sizes=\"auto, (max-width: 439px) 100vw, 439px\" \/><\/a><\/p>\n<\/div><\/section><\/div><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-18maygi-4342869e34285f08f49eb7e3c3aebac7\">\n#top .hr.av-18maygi-4342869e34285f08f49eb7e3c3aebac7{\nmargin-top:30px;\nmargin-bottom:30px;\n}\n.hr.av-18maygi-4342869e34285f08f49eb7e3c3aebac7 .hr-inner{\nwidth:350px;\nborder-color:#358be8;\nmax-width:45%;\n}\n<\/style>\n<div  class='hr av-18maygi-4342869e34285f08f49eb7e3c3aebac7 hr-custom  avia-builder-el-11  el_after_av_one_half  el_before_av_one_full  hr-center hr-icon-yes'><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><span class='av-seperator-icon' aria-hidden='true' data-av_icon='\ue823' data-av_iconfont='entypo-fontello'><\/span><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<div  class='flex_column av-j1k3f6-99ef2a7d1b2f0ed3db384ae1e6fc2278 av_one_full  avia-builder-el-12  el_after_av_hr  avia-builder-el-last  first flex_column_div'     ><section  class='av_textblock_section av-mcj5kw9x-9b157cb2c2fa8e91b7474c4c51e5ee9e'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><span style=\"text-decoration: underline;\">R\u00e9f\u00e9rences pour la physique<\/span> :<\/p>\n<p style=\"text-align: left;\">[1] N. Chastrette, M. Baudoin, P. Brunet, L. Royon, R. Wunenburger, Elucidating the oscillation instability of sessile drops triggered by surface acoustic waves, Phys. Rev. Fluids, 7: 124201 (2022)<br \/>\n[2] A. Bussoni\u00e8re, M. Baudoin, P. Brunet and O. Bou Matar, Dynamics of sessile and pendant drop excited by surface acoustic waves: gravity effects and correlation between oscillatory and translational motions, Phys. Rev. E, 93: 053106 (2016)<br \/>\n[3] M. Baudoin, P. Brunet, O. Bou-Matar, E. Herth, Low power sessile droplet actuation via modulated surface acoustic waves, Appl. Phys. Lett., 100: 154102 (2012)<br \/>\n[5] P. Brunet, M. Baudoin, O. Bou Matar, F. Zoueshtiagh, Droplet displacement and oscillations induced by ultrasonic surface acoustic waves: a quantitative study, Phys. Rev. E, 81: 026315 (2010)<\/p>\n<\/div><\/section><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[297],"tags":[],"class_list":["post-74514","post","type-post","status-publish","format-standard","hentry","category-newsletter"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/74514","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=74514"}],"version-history":[{"count":35,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/74514\/revisions"}],"predecessor-version":[{"id":76470,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/74514\/revisions\/76470"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=74514"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=74514"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=74514"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}