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Surface Analysis of Daguerreotypes with the Optical Metrological Technique of Confocal Microscopy

机译：分析分析与共聚焦显微镜光学计量技术的曲调分析

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This paper presents non-perturbing techniques of optical and surface metrology applied to surface studies of daguerreotypes. Daguerreotypes are positive images developed directly on the surface of silvered copper plates. The image is a sub-micron, ultra-fine-structured surface that exceeds the resolving power of the optical microscope for surface examination. Confocal white light microscopy is shown to be a useful technique for examining the three-dimensional (3D) ultra-fine structure of the daguerreotype image. This technique provides quantitative information of surface characteristics using established surface roughness parameters to document the daguerreotype surface. Examination at this level can measure changes due to environmentally induced deterioration and provide comparative data of before and after chemical and physical treatment. Confocal microscopy shows considerable potential in the evaluation and documentation of both daguerreotype condition and treatments performed on the image structure. Confocal microscopy was used in the close examination of the Southworth and Hawes portrait of an unidentified man and it demonstrated the ability to unambiguously identify and quantify surface damage. The daguerreotype of an unidentified woman wearing a bonnet was treated with ammonium hydroxide solution to remove tarnish and surface changes were followed with confocal microscopy.
机译：本文介绍了应用于Daguerreotypes的表面研究的光学和表面计量的非扰动技术。 Daguerreotypes是直接在镀​​银铜板表面上开发的正图像。图像是子微米，超细结构表面，超过光学显微镜的分辨率进行表面检查。共聚焦白光显微镜被证明是用于检查Daguerreotype图像的三维（3D）超细结构的有用技术。该技术提供了使用建立的表面粗糙度参数来记录Daguerreotype表面的表面特征的定量信息。在这种级别的检查可以测量由于环境诱导的劣化而导致的变化，并提供化学和物理治疗前后的比较数据。共聚焦显微镜在图像结构上进行的Daguerreotype病症和治疗的评估和文件中显示出相当大的潜力。共聚焦显微镜被用于Southworth的密切检查，并戴上未认出人的肖像，并证明了明确识别和量化表面损伤的能力。穿着挡板的未识别的女性的Daguerreotype用氢氧化铵溶液治疗，以除去褪色，并用共聚焦显微镜接下来改变。

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