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.

摘要

聚合物薄膜已广泛用于涂覆传统金属物体，以防止大气氧化和失去光泽。涂层性能与涂层厚度成正比，但目前用于测量涂层厚度以进行处理期间质量控制的方法充其量只是定性的。本文演示了如何使用光纤反射光谱 (FORS) 来准确确定温特图尔博物馆的许多硝酸纤维素涂层银物体上的涂层厚度。FORS 似乎比用于测量薄膜厚度的其他常用方法（例如磁/涡流技术）更准确，但仅限于透明或半透明涂层。FORS 是一个简单的，