Optics for Arts, Architecture, and Archaeology VII最新文献

{"title":"Long-range remote spectroscopy for wall paintings and architectural interiors (Conference Presentation)","authors":"Yu Li, C. Cheung, S. Kogou, Alex Hogg, Florence S. Liggins, Luke Butler, Haida Liang","doi":"10.1117/12.2527614","DOIUrl":"https://doi.org/10.1117/12.2527614","url":null,"abstract":"Material analysis is important to the study of architectural interiors and wall paintings in order to inform the research in history and to monitor the state of conservation. Multimodal spectral analysis is increasingly used in mobile lab campaigns conducted in situ at historical sites. Some challenges specific to the investigation of immovable cultural heritage arise from the inaccessible heights and remoteness of the sites. Therefore, complementary spectroscopic techniques that can be conducted from the ground at a large distance (> 3 m) are required.\u0000\u0000The Imaging and Sensing for Archaeology, Art history and Conservation (ISAAC) Mobile Lab routinely employs remote spectral imaging to record the spectral reflectance in the visible and near infrared of wall paintings at high spatial resolution per pixel. Raman spectroscopy identifies molecular structural fingerprints by observing the spectral shift from the excitation laser wavelength resulting from molecular vibrations. A by-product of Raman spectroscopy is laser induced fluorescence spectroscopy (LIF). Laser-induced breakdown spectroscopy (LIBS) detects characteristic lines for different elements from the plasma created by high power laser pulses. The combination of Raman, LIF, LIBS and spectral reflectance can provide complementary material information about the artworks: molecular structure and elemental composition. Assisted with a computer-controlled telescope mount, small area remote spectroscopic mapping (2D scanning) with Raman and LIF is also achieved to complement long range remote visible and near infrared spectral imaging. \u0000\u0000In this work, we present the developments of a combined long range mobile remote spectroscopy system for working in the range from 3m to 15m, and its recent applications in remote material identifications on wall paintings.","PeriodicalId":169683,"journal":{"name":"Optics for Arts, Architecture, and Archaeology VII","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121148504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simultaneous measurement of refractive index and dispersion using optical coherence tomography for the conservation of plastic sculptures (Conference Presentation)","authors":"Mixon K. Faluweki, Haida Liang, C. Cheung","doi":"10.1117/12.2527612","DOIUrl":"https://doi.org/10.1117/12.2527612","url":null,"abstract":"","PeriodicalId":169683,"journal":{"name":"Optics for Arts, Architecture, and Archaeology VII","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132189998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a hyperspectral imaging setup for the noninvasive identification and mapping of unstable corrosion products in ancient bronze (Conference Presentation)","authors":"A. Vichi, Alex Hogg, Wei Liu, S. Kogou, Haida Liang","doi":"10.1117/12.2527571","DOIUrl":"https://doi.org/10.1117/12.2527571","url":null,"abstract":"Among metal alloys, bronze has been used for millennia to produce many kind of objects, from decorative and religious pieces to sculptures. Although many bronze objects have been well preserved to this day, copper and bronze can be affected by severe degradation involving the formation of copper chloride products, known as “bronze disease” [1]. These chloride products are considered responsible for the rapid decay of bronze, which can ultimately cause the loss of unique and historical artworks. However, copper chlorides constitute only a small fraction of the vast and complex class of corrosion products which can form on historical bronze and copper. It is essential to be able to differentiate between stable from more dangerous unstable corrosion products.\u0000A major challenge of bronze conservation is to non-invasively identify the unstable chloride corrosion throughout the whole artefact. This information is critical for decision-making in conservation process. Different analytical approaches are available to identify these corrosion products. However, most conventional methods require sampling which is not only destructive, but also usually unrepresentative of the object as a whole.\u0000Spectral imaging constitutes a class of non-invasive techniques which have been largely used for the identification and mapping of pigments in paintings [2]. However, it is more challenging to apply spectral imaging to 3D objects.\u0000We have developed a hyperspectral imaging set-up in the visible and near infrared spectral range for 3D objects to rapidly identify and map the corrosion products non-invasively [3]. A preliminary application has been done to study ancient bronze artworks from the National Museum of China. These results are further supported by analysis carried out on selected samples of the same collection with Fibre Optic Reflectance Spectroscopy, Attenuated Total Reflection (ATR)-FTIR spectroscopy, X-rays diffraction, Raman spectroscopy and SEM-EDX.\u0000The possibility of successfully performing hyperspectral imaging for the study of corrosion products would represent a completely novel approach in the analysis of ancient bronze and copper objects. \u0000\u0000[1] Scott, A. D. A Review of Copper Chlorides and Related Salts in Bronze Corrosion and as Painting Pigments. Studies in Conservation, 45: 39-53 (2000)\u0000\u0000[2] Liang, H. Advances in multispectral and hyperspectral imaging for archaeology and art conservation. Applied Physics A, 106 (2), 309-323 (2012)\u0000\u0000[3] Liang, H. et al. Remote hyperspectral imaging with simultaneous 3D texture mapping. Optics for Arts, Architecture, and Archaeology, 10331-25 (2017)","PeriodicalId":169683,"journal":{"name":"Optics for Arts, Architecture, and Archaeology VII","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115512958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methodological considerations regarding the problem of apparent versus intrinsic fluorescence properties of historical paint layers (Conference Presentation)","authors":"F. Pottier, A. Michelin, C. Andraud, F. Goubard, B. Lavédrine","doi":"10.1117/12.2527271","DOIUrl":"https://doi.org/10.1117/12.2527271","url":null,"abstract":"","PeriodicalId":169683,"journal":{"name":"Optics for Arts, Architecture, and Archaeology VII","volume":"124 23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132156406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A study on the coloring mechanism of famous ancient Chinese ceramics (Conference Presentation)","authors":"Weidong Li","doi":"10.1117/12.2525650","DOIUrl":"https://doi.org/10.1117/12.2525650","url":null,"abstract":"","PeriodicalId":169683,"journal":{"name":"Optics for Arts, Architecture, and Archaeology VII","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124798035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The study of the degradation of cadmium yellow paints through their photoluminescence emission from trap states (Conference Presentation)","authors":"D. Comelli, M. Ghirardello, G. Valentini, Austin Nevin, D. MacLennan, A. Phenix, C. S. Patterson, H. Khanjian, K. Trentelman, L. Toniolo, A. Burnstock, Markus S. Gross","doi":"10.1117/12.2525582","DOIUrl":"https://doi.org/10.1117/12.2525582","url":null,"abstract":"The industrial developments of the 19th century included the production of a variety of synthetic pigments and dyes, which were often used by artists who were not concerned with their stability over time. Among these pigments, cadmium yellow, based on cadmium sulfide (CdS), was popular with artists beginning in the mid-19th century. This pigment may discolour or darken and/or exhibit loss of adhesion and formation of white globules on the painting surface [1-2]. Its degradation involves photooxidation of CdS and the formation of degradation products (sulfates, oxalates, and carbonates) [1-4].\u0000However, not all historic paints containing cadmium yellow degrade. It appears that CdS paints produced between the late 19th and early 20th centuries are particularly prone to degradation, as has been documented in paintings dating from 1880 to 1920 [4]. Because these paintings have been exposed to different environmental conditions, it has been speculated that the degradation of cadmium yellow may be related to imperfect syntheses, resulting in the formation of a more reactive form of CdS. However, the link between the presence of these reactive pigments and the tendency of the paint to deteriorate is not well understood.\u0000\u0000CdS is a IIb-IVa semiconductor. When excited by light of an appropriate energy, the semiconductor exhibits a characteristic near band edge (NBE) emission, closely related to the CdS energy bandgap, and emission from intra-bandgap trap states (TS) related to crystal defects [5-6]. Even though little considered when dialing with luminescent paints, the TS emission can provide useful information about surface states in nanocrystalline semiconductors [7]. Moving from nanoscience to conservation studies, the detailed investigation of TS emission in CdS paints is proposed here to probe changes in the density and energy of surface defects and ultimately in the surface reactivity of CdS following degradation.\u0000\u0000Photoluminescence imaging, microscopy, and spectroscopy – complemented by other X-ray based spectroscopies and microscopies – have been used to examine historical and modern manufactured CdS-based paints following artificial aging. Lastly we investigated the degradation of cadmium yellow paints in the painting Femme (Epoque des “Demoiselles d’Avignon”) (1907) by Pablo Picasso.\u0000This study found that in degraded CdS paints the TS emission is much higher in intensity (with respect to NBE emission) and shifted to shorter wavelengths with respect to preserved paint layers. This observation indicates a higher density of TS in the degraded paint, which promotes the surface reactivity of CdS particles and the subsequent paint degradation. In general, results indicated that the analysis of TS emission is a highly sensitive method for identifying early signs of degradation in CdS paints.\u0000\u0000[1] Van der Snickt, G. et al., Anal. Chem. 2009, 81 (7): 2600–2610\u0000[2] Mass, J. et al., Analyst 2013, 138: 6032–6043\u0000[3] Anaf, W. et al., Dyes and Pigments 2015, 1","PeriodicalId":169683,"journal":{"name":"Optics for Arts, Architecture, and Archaeology VII","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126346626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Machine learning analysis of illuminated Southeast Asian manuscripts using complementary noninvasive imaging techniques (Conference Presentation)","authors":"Luke Butler, S. Kogou, Yu Li, C. Cheung, Haida Liang, A. T. Gallop, P. Garside, Christina Duffy","doi":"10.1117/12.2527576","DOIUrl":"https://doi.org/10.1117/12.2527576","url":null,"abstract":"The complementary use of X-ray fluorescence (XRF) mapping, spectral imaging, and Raman mapping, allows for the analysis and identification of important artistic materials used in the production and illustration of illuminated manuscripts. This project uses combined non-invasive imaging techniques to analyse 17th – 19th century manuscripts from the British Library’s Southeast Asia Collections so that more can be understood about the adoption and evolution of artistic materials and techniques used in Maritime Southeast Asia. Using multiple different imaging techniques has shown to provide positive results, however, a consequence of this is the collection of large amounts of data, necessitating the automatic and unsupervised analytical techniques used in machine learning. Data collected in-situ at the British Library using macro-XRF mapping, macro-Raman mapping, and Spectral Imaging, will be analysed using a range of machine learning techniques to cluster pixel information representing materials used in southeast Asian manuscripts.","PeriodicalId":169683,"journal":{"name":"Optics for Arts, Architecture, and Archaeology VII","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123897572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}