Hyperspectral imaging solutions for the non-invasive detection and automated mapping of copper trihydroxychlorides in ancient bronze
Abstract Ancient bronze is subject to complex degradation which can lead, in cases where copper chlorides are present, to a cyclic and self-sustaining degradation process commonly referred to as “bronze disease”. If left untreated, bronze disease can eat away at a bronze object until it is entirely...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2022-09-01
|
| Series: | Heritage Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s40494-022-00765-8 |
| _version_ | 1818064704904364032 |
|---|---|
| author | Florence Liggins Alessandra Vichi Wei Liu Alexander Hogg Sotiria Kogou Jianli Chen Haida Liang |
| author_facet | Florence Liggins Alessandra Vichi Wei Liu Alexander Hogg Sotiria Kogou Jianli Chen Haida Liang |
| author_sort | Florence Liggins |
| collection | DOAJ |
| description | Abstract Ancient bronze is subject to complex degradation which can lead, in cases where copper chlorides are present, to a cyclic and self-sustaining degradation process commonly referred to as “bronze disease”. If left untreated, bronze disease can eat away at a bronze object until it is entirely deteriorated. The presence of copper trihydroxychlorides is indicative that this process is underway and therefore the detection of these corrosion products is necessary in guiding conservation of ancient bronze artefacts. In this paper we present a high spatial/spectral resolution short wave infrared (SWIR) imaging solution for mapping copper trihydroxychlorides in ancient bronze, combining hyperspectral imaging with an in-house developed unsupervised machine learning algorithm for automated spectral clustering. For this work, verification was obtained through use of an in-house developed reference database of typical ancient bronze corrosion products from several archaeological sites, and from collections of the National Museum of China. This paper also explores the suitability, and limitations, of a visible to near-infrared (VNIR) hyperspectral imaging system as a more accessible solution for mapping copper trihydroxychlorides associated with bronze disease. We suggest that our hyperspectral imaging solution can provide a non-invasive, rapid, and high resolution material mapping within and across bronze objects, particularly beneficial for analysing large collections in a museum setting. |
| first_indexed | 2024-12-10T14:40:14Z |
| format | Article |
| id | doaj.art-5edaea90de8246739162d1ff1b905646 |
| institution | Directory Open Access Journal |
| issn | 2050-7445 |
| language | English |
| last_indexed | 2024-12-10T14:40:14Z |
| publishDate | 2022-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Heritage Science |
| spelling | doaj.art-5edaea90de8246739162d1ff1b9056462022-12-22T01:44:42ZengSpringerOpenHeritage Science2050-74452022-09-0110111110.1186/s40494-022-00765-8Hyperspectral imaging solutions for the non-invasive detection and automated mapping of copper trihydroxychlorides in ancient bronzeFlorence Liggins0Alessandra Vichi1Wei Liu2Alexander Hogg3Sotiria Kogou4Jianli Chen5Haida Liang6ISAAC Laboratory, School of Science and Technology, Nottingham Trent UniversityISAAC Laboratory, School of Science and Technology, Nottingham Trent UniversityThe National Museum of ChinaISAAC Laboratory, School of Science and Technology, Nottingham Trent UniversityISAAC Laboratory, School of Science and Technology, Nottingham Trent UniversitySchool of Archaeology and Museology, Peking UniversityISAAC Laboratory, School of Science and Technology, Nottingham Trent UniversityAbstract Ancient bronze is subject to complex degradation which can lead, in cases where copper chlorides are present, to a cyclic and self-sustaining degradation process commonly referred to as “bronze disease”. If left untreated, bronze disease can eat away at a bronze object until it is entirely deteriorated. The presence of copper trihydroxychlorides is indicative that this process is underway and therefore the detection of these corrosion products is necessary in guiding conservation of ancient bronze artefacts. In this paper we present a high spatial/spectral resolution short wave infrared (SWIR) imaging solution for mapping copper trihydroxychlorides in ancient bronze, combining hyperspectral imaging with an in-house developed unsupervised machine learning algorithm for automated spectral clustering. For this work, verification was obtained through use of an in-house developed reference database of typical ancient bronze corrosion products from several archaeological sites, and from collections of the National Museum of China. This paper also explores the suitability, and limitations, of a visible to near-infrared (VNIR) hyperspectral imaging system as a more accessible solution for mapping copper trihydroxychlorides associated with bronze disease. We suggest that our hyperspectral imaging solution can provide a non-invasive, rapid, and high resolution material mapping within and across bronze objects, particularly beneficial for analysing large collections in a museum setting.https://doi.org/10.1186/s40494-022-00765-8Refectance imaging spectroscopyHyperspectral imagingBronze corrosionBronze diseaseAutomated material mapping |
| spellingShingle | Florence Liggins Alessandra Vichi Wei Liu Alexander Hogg Sotiria Kogou Jianli Chen Haida Liang Hyperspectral imaging solutions for the non-invasive detection and automated mapping of copper trihydroxychlorides in ancient bronze Heritage Science Refectance imaging spectroscopy Hyperspectral imaging Bronze corrosion Bronze disease Automated material mapping |
| title | Hyperspectral imaging solutions for the non-invasive detection and automated mapping of copper trihydroxychlorides in ancient bronze |
| title_full | Hyperspectral imaging solutions for the non-invasive detection and automated mapping of copper trihydroxychlorides in ancient bronze |
| title_fullStr | Hyperspectral imaging solutions for the non-invasive detection and automated mapping of copper trihydroxychlorides in ancient bronze |
| title_full_unstemmed | Hyperspectral imaging solutions for the non-invasive detection and automated mapping of copper trihydroxychlorides in ancient bronze |
| title_short | Hyperspectral imaging solutions for the non-invasive detection and automated mapping of copper trihydroxychlorides in ancient bronze |
| title_sort | hyperspectral imaging solutions for the non invasive detection and automated mapping of copper trihydroxychlorides in ancient bronze |
| topic | Refectance imaging spectroscopy Hyperspectral imaging Bronze corrosion Bronze disease Automated material mapping |
| url | https://doi.org/10.1186/s40494-022-00765-8 |
| work_keys_str_mv | AT florenceliggins hyperspectralimagingsolutionsforthenoninvasivedetectionandautomatedmappingofcoppertrihydroxychloridesinancientbronze AT alessandravichi hyperspectralimagingsolutionsforthenoninvasivedetectionandautomatedmappingofcoppertrihydroxychloridesinancientbronze AT weiliu hyperspectralimagingsolutionsforthenoninvasivedetectionandautomatedmappingofcoppertrihydroxychloridesinancientbronze AT alexanderhogg hyperspectralimagingsolutionsforthenoninvasivedetectionandautomatedmappingofcoppertrihydroxychloridesinancientbronze AT sotiriakogou hyperspectralimagingsolutionsforthenoninvasivedetectionandautomatedmappingofcoppertrihydroxychloridesinancientbronze AT jianlichen hyperspectralimagingsolutionsforthenoninvasivedetectionandautomatedmappingofcoppertrihydroxychloridesinancientbronze AT haidaliang hyperspectralimagingsolutionsforthenoninvasivedetectionandautomatedmappingofcoppertrihydroxychloridesinancientbronze |