{"id":1839,"date":"2024-07-02T10:44:35","date_gmt":"2024-07-02T08:44:35","guid":{"rendered":"https:\/\/www.fresnel.fr\/wp\/?post_type=hipe&p=1839"},"modified":"2025-01-06T17:10:48","modified_gmt":"2025-01-06T16:10:48","slug":"microwave-tomography","status":"publish","type":"hipe","link":"https:\/\/www.fresnel.fr\/wp\/en\/hipe\/themes\/microwave-tomography\/","title":{"rendered":"Microwave tomography"},"content":{"rendered":"

L\u2019imagerie par diffraction consiste \u00e0 extraire l\u2019information contenue dans un champ \u00e9lectromagn\u00e9tique \u00e0 l\u2019aide d\u2019un algorithme d\u2019inversion afin de retrouver la structure responsable d\u2019un tel ph\u00e9nom\u00e8ne de diffraction.<\/p>\n

Nous \u00e9tudions et proposons diff\u00e9rentes classes d\u2019algorithmes d\u2019inversion\u00a0:
\n– des techniques qualitatives non it\u00e9ratives (r\u00e9tropropagation, tomographie par diffraction [1]<\/a>, DORT\u00a0[2]<\/a>\u00a0, Linear Sampling Method, MUSIC , corr\u00e9lation des champs\u00a0[3]<\/a>, \u2026)
\n– des techniques quantitatives it\u00e9ratives (m\u00e9thodes de Newton en utilisant des \u00e9tats adjoints [4]<\/a>\u00a0[5]<\/a>) avec prise en compte d\u2019information a priori\u00a0:<\/p>\n

– algorithme level-set pour des objets homog\u00e8nes par morceaux [6]<\/a>,
\n– repr\u00e9sentation des inconnues sur des bases de fonctions adapt\u00e9es [7<\/a>,8<\/a>],
\nr\u00e9gularisation,
\n– approche Bay\u00e9sienne prenant en compte le bruit de mesure [9<\/a>,\u00a010<\/a>].<\/p>\n

Gr\u00e2ce \u00e0 ces algorithmes, il est possible de reconstruire des images de sc\u00e8nes \u00e0 partir de champs \u00e9lectromagn\u00e9tiques mesur\u00e9s en espace libre\u00a0[12]<\/a>,\u00a0[4]<\/a>, en milieu stratifi\u00e9\u00a0[3]<\/a>,\u00a0[11]<\/a>, en cavit\u00e9\u00a0[2]<\/a>, [7<\/a>,8<\/a>].<\/p>\n

\"\"<\/p>\n

Contact\u00a0:<\/strong> Am\u00e9lie Litman
\nMots-cl\u00e9s\u00a0:\u00a0<\/strong>Probl\u00e8mes inverses, imagerie par diffraction, imagerie quantitative, contr\u00f4le non-destructif, imagerie \u00e0 partir de mesures<\/p>\n","protected":false},"author":10,"featured_media":2553,"parent":1726,"menu_order":7,"template":"","thematique":[23],"class_list":{"0":"post-1839","1":"hipe","2":"type-hipe","3":"status-publish","4":"has-post-thumbnail","6":"entry"},"acf":[],"lang":"en","translations":{"en":1839,"fr":755},"pll_sync_post":[],"_links":{"self":[{"href":"https:\/\/www.fresnel.fr\/wp\/wp-json\/wp\/v2\/hipe\/1839","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fresnel.fr\/wp\/wp-json\/wp\/v2\/hipe"}],"about":[{"href":"https:\/\/www.fresnel.fr\/wp\/wp-json\/wp\/v2\/types\/hipe"}],"author":[{"embeddable":true,"href":"https:\/\/www.fresnel.fr\/wp\/wp-json\/wp\/v2\/users\/10"}],"version-history":[{"count":0,"href":"https:\/\/www.fresnel.fr\/wp\/wp-json\/wp\/v2\/hipe\/1839\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.fresnel.fr\/wp\/wp-json\/wp\/v2\/hipe\/1726"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.fresnel.fr\/wp\/wp-json\/wp\/v2\/media\/2553"}],"wp:attachment":[{"href":"https:\/\/www.fresnel.fr\/wp\/wp-json\/wp\/v2\/media?parent=1839"}],"wp:term":[{"taxonomy":"thematique","embeddable":true,"href":"https:\/\/www.fresnel.fr\/wp\/wp-json\/wp\/v2\/thematique?post=1839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}