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首页> 外文期刊>Microchemical Journal: Devoted to the Application of Microtechniques in all Branches of Science >Visible-induced luminescence imaging: A user-friendly method based on a system of interchangeable and tunable LED light sources
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Visible-induced luminescence imaging: A user-friendly method based on a system of interchangeable and tunable LED light sources

机译：可见光致发光成像：一种基于用户友好的方法，基于可互换和可调式LED光源系统

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摘要

Imaging techniques represent an unavoidable analytical tool for the non-invasive investigation of cultural heritage objects providing useful information for the identification and distribution of materials on the investigated surface. In particular, photo-induced luminescence imaging can give important indications as to the distribution of organic (binders, resins, dyes and lakes) and inorganic (Egyptian blue, Han blue, Han purple, zinc oxide, cadmium based pigments) constituting materials. Recently the use of LEDs, generating a narrow emission band in the Visible range, has been introduced opening up a new perspective in the detection of inorganic luminescent pigments. In this work we propose a user-friendly tool for luminescence acquisition based on the use of a custom made interchangeable and tunable LED light source system, that allows us to select both the power and the wavelength of the excitation light. The study involved the analysis of panel painting replicas prepared applying several pigments and lakes commonly used by artists in different historical periods. The luminescence images were recorded by a high sensitivity CCD camera and a Vidicon camera in the Visible and NIR range, under three excitation narrow bands (red LEDs at 630 nm; green LEDs at 517 nm and blue LEDs at 465 nm). The reliability of the developed experimental setup has been validated by spectrofluorimetric measurements. A very high correspondence between imaging and spectral response has been found concerning emission band position, emission intensity and excitation wavelength effect. Furthermore, the NIR luminescence of a modern yellow pigment, nickel titanate, has been for the first time documented. The defined methodology has been applied to the study of works of art of different historical periods where it has been proved to successfully detect luminescent inorganic and organic pigments, whose presence has been confirmed also by elemental analyses and spectrofluorimetry. (C) 2015 Elsevier B.V. All rights reserved.
机译：成像技术代表了对文化遗产对象进行非侵入式调查的不可避免的分析工具，可提供有用的信息来识别和分配被调查表面上的材料。特别地，光致发光成像可以对构成有机材料（粘合剂，树脂，染料和色淀）和无机材料（埃及蓝，汉蓝，汉紫，氧化锌，镉基颜料）的分布提供重要指示。最近，已经引入了在可见光范围内产生窄发射带的LED的使用，从而为检测无机发光颜料开辟了新的视野。在这项工作中，我们基于使用定制的可互换和可调谐LED光源系统，提出了一种用于获取荧光的用户友好工具，该工具使我们能够选择激发光的功率和波长。这项研究包括分析使用不同历史时期艺术家常用的几种颜料和湖泊制备的板画复制品。在三个激发窄带下（630 nm的红色LED; 517 nm的绿色LED和465 nm的蓝色LED），通过高灵敏度CCD相机和Vidicon相机在可见光和近红外范围内记录发光图像。已开发的实验装置的可靠性已通过荧光光谱法测量验证。已经发现在成像和光谱响应之间关于发射带位置，发射强度和激发波长效应有非常高的对应关系。此外，首次记录了现代黄色颜料钛酸镍的NIR发光。定义的方法已用于研究不同历史时期的艺术品，已被证明可成功检测发光的无机和有机颜料，并且其存在也已通过元素分析和荧光光谱法得以证实。 （C）2015 Elsevier B.V.保留所有权利。

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