{"id":6898,"date":"2024-02-28T12:02:21","date_gmt":"2024-02-28T11:02:21","guid":{"rendered":"http:\/\/www.e-rihs.it\/?page_id=6898"},"modified":"2024-05-07T12:10:59","modified_gmt":"2024-05-07T11:10:59","slug":"dhspi-2","status":"publish","type":"page","link":"https:\/\/www.e-rihs.it\/en\/dhspi-2\/","title":{"rendered":"DHSPI"},"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\/2024\/02\/DHSPI.jpg” title_text=”DHSPI” _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

<\/strong><\/p>\n

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

Digital Holographic Speckle Pattern Interferometer (DHSPI )<\/p>\n

 <\/p>\n

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

La Digital Speckle Pattern Interferometry (DHSPI)\u00a0 \u00e8 una metodologia ottica non distruttiva in grado\u00a0 di identificare, visualizzare e misurare i difetti \u2013 anche non visibili- di una superficie a seguito una sollecitazione. Tale metodologia pu\u00f2 quindi verificare \u00a0\u00a0lo stato di un\u2019opera d\u2019arte \u00a0senza necessit\u00e0 di alcun tipo di contatto ed inoltre pu\u00f2 essere utilizzata per un\u2019azione di monitoraggio, andando a visualizzare le frequenze naturali dell\u2019oggetto in analisi, \u00a0e osservandone le modifiche al variare delle condizioni ambientali.\u00a0\u00a0<\/p>\n

Un\u2019immagine di tipo interferometrico viene ottenuta sovrapponendo su una CCD un fascio laser di riferimento e la radiazione \u00a0retrodiffusa della superficie in esame quando\u00a0 illuminata dalla stessa radiazione laser ad alta coerenza spaziale. Sottoponendo la superficie da analizzare ad una sollecitazione (ad esempio di tipo termico mediante lampade IR) si osserver\u00e0 un\u2019evoluzione delle figure di interferenza, ognuna delle quali, opportunamente filtrata, e analizzata, offrir\u00e0 una misura della deformazione fuori del piano in multipli della met\u00e0 della lunghezza d\u2019onda della radiazione utilizzata. Tale tecnica pu\u00f2 essere utilizzata con successo su opere d\u2019arte\u00a0 sia per misure non distruttive dello stato di conservazione, sia per \u00a0monitoraggio delle stesse. Pu\u00f2 essere utile per un\u2019analisi non invasiva e non a contatto delle superfici mettendo in evidenza la presenza di crepe vuoti e distacchi su affreschi. Pu\u00f2 inoltre \u2013 identificando difetti non ancora visibili- consentire ipotesi nell\u2019evoluzione di problemi presenti guidando gli interventi conservativi.<\/p>\n

 <\/p>\n

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

Il sistema DHSPI messo a disposizione dalla Sede Secondaria di Pozzuoli di CNR- INO utilizza\u00a0 una\u00a0 sistema laser emettente\u00a0 fino a 300mW a 532 nm, con un fascio gaussiano di tipo TEM00 ed una lunghezza di coerenza > 30m.<\/p>\n

Con l\u2019obiettivo standard\u00a0 da 25mm attualmente in uso si possono effettuare misure con un FOV di 30cm alla distanza di 1 metro.<\/p>\n

Il segnale viene raccolto da una CCD con un sensore di 3.6MPx.<\/p>\n

La risoluzione in z della deformazione \u00e8 pari alla met\u00e0 della lunghezza d\u2019onda della radiazione utilizzata, quindi 266nm.<\/p>\n

 <\/p>\n

Referente:<\/p>\n

Alessandra Rocco alessandra.rocco@ino.cnr.it<\/a><\/p>\n

 <\/p>\n

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

<\/strong><\/p>\n

<\/strong><\/p>\n

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

LABORATORIO: CNR-INO NOME STRUMENTO Digital Holographic Speckle Pattern Interferometer (DHSPI )   INFORMAZIONI GENERALI La Digital Speckle Pattern Interferometry (DHSPI)\u00a0 […]<\/p>\n","protected":false},"author":17,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-6898","page","type-page","status-publish","hentry"],"yoast_head":"\nDHSPI | E-RIHS.it<\/title>\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.e-rihs.it\/en\/dhspi-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DHSPI | E-RIHS.it\" \/>\n<meta property=\"og:description\" content=\"LABORATORIO: CNR-INO NOME STRUMENTO Digital 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