A Portable Dynamic Laser Speckle System for Sensing Long-Term Changes Caused by Treatments in Painting Conservation
نویسندگان
چکیده
Dynamic laser speckle (DLS) is used as a reliable sensor of activity for all types of materials. Traditional applications are based on high-rate captures (usually greater than 10 frames-per-second, fps). Even for drying processes in conservation treatments, where there is a high level of activity in the first moments after the application and slower activity after some minutes or hours, the process is based on the acquisition of images at a time rate that is the same in moments of high and low activity. In this work, we present an alternative approach to track the drying process of protective layers and other painting conservation processes that take a long time to reduce their levels of activity. We illuminate, using three different wavelength lasers, a temporary protector (cyclododecane) and a varnish, and monitor them using a low fps rate during long-term drying. The results are compared to the traditional method. This work also presents a monitoring method that uses portable equipment. The results present the feasibility of using the portable device and show the improved sensitivity of the dynamic laser speckle when sensing the long-term process for drying cyclododecane and varnish in conservation.
منابع مشابه
Dynamic Laser Speckle Technique Sensing Long- Term Changes Caused by Painting Treatments in Restauration of Paintings
Dynamic laser speckle is applied as a reliable sensor of activity in all sort of material. 1 Traditional applications are based on a time rate that is usually higher than 10 frames-per-second 2 (FPS). Even in drying processes, where there is a high activity in the first moments after the painting 3 and a slow activity after some minutes or hours, the process is based on the acquisition of image...
متن کاملبررسی و شناخت ماهیت دیوارنگارههای بومپارچه به عنوان شیوهای خاص از آرایههای معماری اسلامی ایران
Murals are the main, media of human culture and civilization and the place and its long history in Iranian art is clear. There are specific forms of mural paintings in some Iranian architecture that are different from other usual wall paintings in materials, methods as well as implementation techniques. Unfortunately, these mural paintings are not studied certainly until now. Therefore, further...
متن کاملDynamic Harmonic Analysis of Long Term over Voltages Based on Time Varying Fourier series in Extended Harmonic Domain
Harmonics have become an important issue in modern power systems. The widespread penetration of non-linear loads to emerging power systems has turned power quality analysis into an important operation issue under both steady state and transient conditions. This paper employs an Extended Harmonic Domain (EHD) based framework for dynamic analysis of long term analysis over voltages during the tra...
متن کاملPhotometric Stereo by UV-Induced Fluorescence to Detect Protrusions on Georgia O'Keeffe's Paintings
A significant number of oil paintings produced by Georgia O’Keeffe (1887-1986) show surface protrusions of varying width, up to several hundreds of microns. These protrusions are similar to those described in the art conservation literature as metallic soaps. Since the presence of these protrusions raises questions about the state of conservation and long-term prospects for deterioration of the...
متن کاملChanges in petrophysical properties of the stone surface due to past conservation treatments in archaeological sites of Merida (Spain)
Petrophysical properties, such as porosity, permeability, density or anisotropy determine the alterability of stone surfaces from archaeological sites, and therefore, the future preservation of the material. Others, like superficial roughness or color, may point out changes due to alteration processes, natural or man-induced, for example, by conservation treatments. The application of conservat...
متن کامل