{"id":3138,"date":"2020-12-17T12:07:49","date_gmt":"2020-12-17T11:07:49","guid":{"rendered":"http:\/\/www.e-rihs.it\/?page_id=3138"},"modified":"2024-05-07T12:29:34","modified_gmt":"2024-05-07T11:29:34","slug":"optical-coherence-tomography-2","status":"publish","type":"page","link":"https:\/\/www.e-rihs.it\/en\/optical-coherence-tomography-2\/","title":{"rendered":"Optical Coherence Tomography"},"content":{"rendered":"

[et_pb_section fb_built=”1″ _builder_version=”4.7.7″ _module_preset=”default”][et_pb_row column_structure=”2_5,3_5″ _builder_version=”4.7.7″ _module_preset=”default” hover_enabled=”0″ sticky_enabled=”0″][et_pb_column type=”2_5″ _builder_version=”4.7.7″ _module_preset=”default”][et_pb_image src=”http:\/\/www.e-rihs.it\/wp-content\/uploads\/2022\/03\/OCT.jpg” title_text=”OCT” _builder_version=”4.7.7″ _module_preset=”default”][\/et_pb_image][\/et_pb_column][et_pb_column type=”3_5″ _builder_version=”4.7.7″ _module_preset=”default”][et_pb_text _builder_version=”4.7.7″ _module_preset=”default”]<\/p>\n

LABORATORIO: CNR INO<\/strong><\/p>\n

 <\/p>\n

NOME STRUMENTO<\/strong><\/p>\n

Strumento FD-OCT;\u00a0strumento TD-OCT<\/p>\n

 <\/p>\n

INFORMAZIONI GENERALI<\/strong><\/p>\n

La tomografia ottica coerente (OCT), tipicamente impiegata in campo biomedicale, \u00e8 una tecnica interferometrica che fornisce sezioni stratigrafiche ad alta risoluzione di oggetti diffondenti o semi-trasparenti. Essa fa uso di una sorgente con emissione nel visibile o nel vicino infrarosso, la cui larghezza spettrale determina la risoluzione in profondit\u00e0. Nel campo della diagnostica dei dipinti, l\u2019OCT ha trovato valida applicazione nella misura in profondit\u00e0 di stratificazioni di materiali pittorici in modo completamente non-invasivo. Tale analisi si rivela particolarmente utile per il monitoraggio e la documentazione di variazioni di spessore micrometriche durante interventi di restauro come la pulitura, che prevede la rimozione selettiva di patine deteriorate o depositi (vernici, ossalati, ridipinture) presenti sulle superfici pittoriche. La visualizzazione di stratificazioni mediante OCT pu\u00f2 tuttavia essere ostacolata in presenza di interfacce altamente diffondenti, che impediscono la propagazione in profondit\u00e0 della radiazione incidente. Allo scopo di superare tale limite, la tecnica OCT \u00e8 stata accoppiata alla microscopia confocale a scansione, consentendo cos\u00ec di focalizzare il fascio incidente sull\u2019interfaccia di interesse (anche all\u2019interno del materiale) e massimizzare il segnale retro-diffuso.<\/p>\n

 <\/p>\n

DETTAGLI TECNICI<\/strong><\/p>\n

La capacit\u00e0 della radiazione di penetrare la materia dipende sia dalle propriet\u00e0 di quest\u2019ultima (composizione chimica, spessore, \u2026) sia dalla lunghezza d\u2019onda della radiazione utilizzata. A tale proposito, CNR-INO mette a disposizione due dispositivi per OCT, operanti rispettivamente a 1300 nm (dominio della frequenza, FD-OCT) e 1550 nm (dominio del tempo in modalit\u00e0 confocale, confocal TD-OCT). L\u2019output degli strumenti \u00e8 un set di immagini stratigrafiche del campione, anche dette immagini tomografiche, che costituiscono il cosiddetto tumocube<\/em>. Esso pu\u00f2 essere analizzato secondo una qualsiasi sezione (xz, yz, xy<\/em>). Lo strumento FD-OCT consente di acquisire volumi di dimensione massima 10 mm \u00d7 10 mm \u00d7 3.5 mm con una risoluzione laterale di 13 micron e assiale (in profondit\u00e0) di 5.5 micron in aria. Lo strumento TD-OCT, invece, volumi di dimensione massima 25 mm \u00d7 25 mm \u00d7 1 mm con una risoluzione laterale di circa 2.5 micron e assiale di circa 10 micron in aria. I valori della risoluzione assiale sono dati per funzionamento in aria e sono, dunque, da dividere per l\u2019indice di rifrazione della sostanza attraversata.<\/p>\n

A seconda delle caratteristiche dell\u2019opera da analizzare, viene utilizzato l\u2019uno o l\u2019altro dei due sistemi.<\/p>\n

 <\/p>\n

Referente:
Raffaella Fontana raffaella.fontana@ino.cnr.it<\/a><\/p>\n

 <\/p>\n

Scarica la scheda completa<\/a><\/p>\n

 <\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"

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