{"id":41274,"date":"2024-07-23T08:04:35","date_gmt":"2024-07-23T06:04:35","guid":{"rendered":"https:\/\/www.linseis.com\/determination-des-temperatures-de-conversion-des-echantillons-dacier-a-laide-de-taches-laser\/"},"modified":"2025-08-06T14:25:20","modified_gmt":"2025-08-06T12:25:20","slug":"determination-des-temperatures-de-conversion-des-echantillons-dacier-a-laide-de-taches-laser","status":"publish","type":"post","link":"https:\/\/www.linseis.com\/fr\/actualites\/determination-des-temperatures-de-conversion-des-echantillons-dacier-a-laide-de-taches-laser\/","title":{"rendered":"D\u00e9termination des temp\u00e9ratures de conversion des \u00e9chantillons d&rsquo;acier \u00e0 l&rsquo;aide de taches laser"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"41274\" class=\"elementor elementor-41274 elementor-16629\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9eb8745 e-flex e-con-boxed elementor-invisible e-con e-parent\" data-id=\"9eb8745\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;fadeInUp&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ffaef65 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"ffaef65\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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>La mesure de la variation de longueur en fonction de la temp\u00e9rature peut \u00eatre utilis\u00e9e pour d\u00e9terminer la temp\u00e9rature \u00e0 laquelle une transformation structurelle a lieu dans les \u00e9chantillons d&rsquo;acier.\nAvec la m\u00e9thode des mouchetures laser, la surface de l&rsquo;\u00e9chantillon est \u00e9clair\u00e9e par un laser et observ\u00e9e par le haut \u00e0 l&rsquo;aide d&rsquo;une cam\u00e9ra.\nEn m\u00eame temps, l&rsquo;\u00e9chantillon est chauff\u00e9 \u00e0 l&rsquo;aide d&rsquo;une bobine d&rsquo;induction.\nPour filtrer le rayonnement thermique et la lumi\u00e8re \u00e9mise par l&rsquo;\u00e9chantillon incandescent, un laser bleu est utilis\u00e9 et des filtres appropri\u00e9s sont plac\u00e9s devant la cam\u00e9ra.   <\/p>\n\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-1089cc3 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"1089cc3\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Sch\u00e9ma de l'installation<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-194a95e elementor-invisible elementor-widget elementor-widget-image\" data-id=\"194a95e\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"300\" height=\"268\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Grafik-1-300x268-1.png\" class=\"attachment-2048x2048 size-2048x2048 wp-image-16634\" alt=\"\" \/>\t\t\t\t\t\t\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-d3857b9 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"d3857b9\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Mesure<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cfa7bd8 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"cfa7bd8\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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>Pendant la mesure, l&rsquo;\u00e9chantillon est chauff\u00e9 par induction et, en m\u00eame temps, les miroitements g\u00e9n\u00e9r\u00e9s par le laser sont observ\u00e9s avec la cam\u00e9ra.\nSelon la vitesse de la mesure, il est possible d&rsquo;enregistrer jusqu&rsquo;\u00e0 50 images par seconde. <\/p>\n\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-a9ea203 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"a9ea203\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">L'\u00e9valuation<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f296a60 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"f296a60\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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>L&rsquo;appareil photo g\u00e9n\u00e8re des s\u00e9quences d&rsquo;images de ce type :<\/p>\n\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-590e1d7 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"590e1d7\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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>\u00c9tant donn\u00e9 que les taches sont principalement g\u00e9n\u00e9r\u00e9es par des effets d&rsquo;interf\u00e9rence sur les irr\u00e9gularit\u00e9s de la surface de l&rsquo;\u00e9chantillon, le mouvement des taches sur la surface peut \u00eatre mesur\u00e9 en suivant des zones d\u00e9finies par l&rsquo;utilisateur.<\/p>\n<p>Un algorithme sp\u00e9cial bas\u00e9 sur la corr\u00e9lation crois\u00e9e de deux images cons\u00e9cutives d\u00e9termine le mouvement des zones de l&rsquo;image.<\/p>\n<p>La taille et la position des zones peuvent \u00eatre d\u00e9finies par l&rsquo;utilisateur.\nOutre le suivi de la distance totale des zones, la direction du suivi peut \u00eatre limit\u00e9e \u00e0 la verticale et \u00e0 l&rsquo;horizontale. <\/p>\n\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-721ede4 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"721ede4\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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\t\t\t<img decoding=\"async\" width=\"300\" height=\"162\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Grafik-2-300x162-1.png\" class=\"attachment-medium_large size-medium_large wp-image-16641\" alt=\"\" \/>\t\t\t\t\t\t\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-29c2b60 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"29c2b60\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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>Cela permet de mesurer le comportement anisotrope de l&rsquo;expansion des \u00e9chantillons.\nL&rsquo;expansion mesur\u00e9e est ind\u00e9pendante de l&rsquo;expansion de la tige de pouss\u00e9e. <br>  Un grand avantage par rapport \u00e0 la mesure LVDT est que la temp\u00e9rature sur la petite surface enregistr\u00e9e par la cam\u00e9ra est distribu\u00e9e de mani\u00e8re beaucoup plus homog\u00e8ne que sur toute la longueur de l&rsquo;\u00e9chantillon.\nLes transitions microstructurelles peuvent donc \u00eatre observ\u00e9es plus clairement qu&rsquo;avec le LVDT. <\/p>\n\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-1ac67eb elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"1ac67eb\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:100}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Comparaison avec la mesure de la tige de pouss\u00e9e<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-64ce74b elementor-invisible elementor-widget elementor-widget-image\" data-id=\"64ce74b\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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\t\t\t<img decoding=\"async\" width=\"300\" height=\"169\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Grafik-3-300x169-1.png\" class=\"attachment-medium_large size-medium_large wp-image-16651\" alt=\"\" \/>\t\t\t\t\t\t\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-2e193bf elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"2e193bf\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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>Cette image montre le signal de mesure du LVDT dans la direction X (noir) et le signal de mesure de la cam\u00e9ra speckles dans la direction Y (bleu).\nLes points de d\u00e9part et d&rsquo;arriv\u00e9e des transitions de phase peuvent \u00eatre observ\u00e9s plus clairement. <\/p>\n\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-7396e18 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"7396e18\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Mesure d'un \u00e9chantillon de traction<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0b7959b elementor-invisible elementor-widget elementor-widget-image\" data-id=\"0b7959b\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"262\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Grafik-4-300x262-1.png\" class=\"attachment-large size-large wp-image-16661\" alt=\"\" \/>\t\t\t\t\t\t\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-c545a36 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"c545a36\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"127\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Messung-2-300x127-1.png\" class=\"attachment-large size-large wp-image-16668\" alt=\"\" \/>\t\t\t\t\t\t\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-5c33d3b elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"5c33d3b\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:250}\" 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>Pour les \u00e9chantillons de traction, la mesure de l&rsquo;expansion peut \u00eatre effectu\u00e9e en d\u00e9finissant plusieurs r\u00e9gions ind\u00e9pendantes.\nIl est possible de suivre ces r\u00e9gions pour mesurer l&rsquo;expansion entre ces points dans la direction axiale. <\/p>\n\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-3ad7e18 elementor-widget elementor-widget-spacer\" data-id=\"3ad7e18\" 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\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>En mesurant le changement de longueur en fonction de la temp\u00e9rature, il est possible de d\u00e9terminer la temp\u00e9rature \u00e0 laquelle une transformation microstructurale a lieu dans les \u00e9chantillons d&rsquo;acier.<\/p>\n","protected":false},"author":3,"featured_media":16624,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[186],"tags":[],"class_list":["post-41274","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.linseis.com\/fr\/wp-json\/wp\/v2\/posts\/41274","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linseis.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linseis.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/fr\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/fr\/wp-json\/wp\/v2\/comments?post=41274"}],"version-history":[{"count":0,"href":"https:\/\/www.linseis.com\/fr\/wp-json\/wp\/v2\/posts\/41274\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/fr\/wp-json\/wp\/v2\/media\/16624"}],"wp:attachment":[{"href":"https:\/\/www.linseis.com\/fr\/wp-json\/wp\/v2\/media?parent=41274"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linseis.com\/fr\/wp-json\/wp\/v2\/categories?post=41274"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linseis.com\/fr\/wp-json\/wp\/v2\/tags?post=41274"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}