Michael K. Crawford, Lauren M. Fair, Katelyn Rovito, Tia Polidori, Rosie Grayburn
{"title":"Thickness Measurements of Clear Coatings on Silver Objects using Fiber Optic Reflectance Spectroscopy","authors":"Michael K. Crawford, Lauren M. Fair, Katelyn Rovito, Tia Polidori, Rosie Grayburn","doi":"10.1080/01971360.2020.1812317","DOIUrl":null,"url":null,"abstract":"ABSTRACT Polymer films have been used extensively to coat heritage metal objects to provide protection against atmospheric oxidation and tarnish. Coating performance is directly proportional to coating thickness, but current methods used to measure coating thickness for quality control during treatment are qualitative at best. This paper demonstrates how fiber optic reflectance spectroscopy (FORS) was used to accurately determine coating thicknesses on a number of nitrocellulose-coated silver objects at Winterthur Museum. FORS appears to be significantly more accurate than other common methods used to measure film thickness, such as magnetic/eddy current techniques, but is limited to transparent or semi-transparent coatings. FORS is a simple, accurate method for measuring the thickness of protective coatings on a wide range of cultural heritage metal objects.","PeriodicalId":17165,"journal":{"name":"Journal of the American Institute for Conservation","volume":"61 1","pages":"71 - 84"},"PeriodicalIF":0.7000,"publicationDate":"2021-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/01971360.2020.1812317","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Institute for Conservation","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1080/01971360.2020.1812317","RegionNum":4,"RegionCategory":"社会学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"0","JCRName":"HUMANITIES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 2
Abstract
ABSTRACT Polymer films have been used extensively to coat heritage metal objects to provide protection against atmospheric oxidation and tarnish. Coating performance is directly proportional to coating thickness, but current methods used to measure coating thickness for quality control during treatment are qualitative at best. This paper demonstrates how fiber optic reflectance spectroscopy (FORS) was used to accurately determine coating thicknesses on a number of nitrocellulose-coated silver objects at Winterthur Museum. FORS appears to be significantly more accurate than other common methods used to measure film thickness, such as magnetic/eddy current techniques, but is limited to transparent or semi-transparent coatings. FORS is a simple, accurate method for measuring the thickness of protective coatings on a wide range of cultural heritage metal objects.
期刊介绍：
The American Institute for Conservation is the largest conservation membership organization in the United States, and counts among its more than 3000 members the majority of professional conservators, conservation educators and conservation scientists worldwide. The Journal of the American Institute for Conservation (JAIC, or the Journal) is the primary vehicle for the publication of peer-reviewed technical studies, research papers, treatment case studies and ethics and standards discussions relating to the broad field of conservation and preservation of historic and cultural works. Subscribers to the JAIC include AIC members, both individuals and institutions, as well as major libraries and universities.
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