Showing papers by "Domenica Paoletti published in 1996"
TL;DR: The interferometric techniques complement other methods of nondestructive testing used in artwork diagnostics but are not yet sufficient to give an optimal response to the many problems of the restoration field.
Abstract: Publisher Summary This chapter surveys different interferometric methods and their application to nondestructive artwork testing. The chapter analyzes the holographic methods used for artwork diagnostics and considers some optical arrangements. A measuring instrument should visualize micro deformation and/or displacement, perform real-time analysis, operate under field conditions, and require a minimum of adjustments. These requirements can be fulfilled with electronic speckle pattern interferometry (ESPI), a technique used as an industrial inspection tool. The interferometric techniques complement other methods of nondestructive testing used in artwork diagnostics but are not yet sufficient to give an optimal response to the many problems of the restoration field. A more effective collaboration with conservation scientists and restorers in the future might play an important role in familiarization with various problems of conservation and yield to the development of portable, inexpensive and easy to use instruments.
42 citations
TL;DR: The interdisciplinary nature of the proposed technique is outlined by emphasizing its connections with electronics, digital image processing and numerical analysis and an extensive simulation of the procedure and preliminary experimental results are presented.
Abstract: In this paper the application of DSPI to diffusion evaluation in liquid binary mixtures is discussed. The interdisciplinary nature of the proposed technique is outlined by emphasizing its connections with electronics, digital image processing and numerical analysis. An extensive simulation of the procedure and preliminary experimental results are presented. On analyse la methode DSPI pour l'etude experimentale de la diffusion dans les melanges liquides binaires. La nature interdisciplinaire de la methode qu'on propose est montree en mettant en evidence ses liasons avec l'electronique, les processus digitaux d'image et l'analyse numerique. On presente une etendue simulation de la methode et les premiers resultats experimentaux.
20 citations
TL;DR: In this paper, a digital angular speckle correlation method for rough surface diagnostic is developed; the system has the important attributes of on-line real-time measurement, simplicity and flexibility.
17 citations
TL;DR: In this article, a laser speckle technique is proposed for the study of diffusion in transparent liquid mixtures, where the diffusion constants can be deduced by a simple manipulation of the specckle patterns recorded during the diffusion process.
Abstract: A laser speckle technique is proposed for the study of diffusion in transparent liquid mixtures. The diffusion constants may be deduced by a simple manipulation of the speckle patterns recorded during the diffusion process. The proposed method, checked with the LiBr-water system, gives reasonable agreement with existing data.
16 citations
TL;DR: In this paper, a digital speckle system that allows the study of efflorescence mechanisms on stone samples and, at the same time, the measurement of the damage due to salt crystals accumulated inside the material is presented.
Abstract: Salt weathering affects rocks, building stones, mortars, bricks and paintings. The aim of this paper is to present a digital speckle system that allows the study of efflorescence mechanisms on stone samples and, at the same time, the measurement of the damage due to salt crystals accumulated inside the material. Some tests have been performed on quarry samples with characteristics similar to those of some ancient artifacts of L'Aquila, submitted to accelerated salt crystallisation (NaCl) cycles; preliminary experiments have been effected.
3 citations
23 Aug 1996
TL;DR: In this article, a non contacting, full field, variable sensitivity optical method is proposed for an experimental analysis of the local amplitude vibration of a diffuse surface based on sinusoidal fringe projection interferometer just developed for contour map.
Abstract: A new non contacting, full field, variable sensitivity optical method is proposed for an experimental analysis of the local amplitude vibration of a diffuse surface. It is based on sinusoidal fringe projection interferometer just developed for contour map. Linear sinusoidal fringes, which are formed by the interference of two wave fronts emitted from the output of a fiber coupler, are projected on the object surface. The visibility of these fringes is modulated by a function of local amplitude of vibration; thus loci of constant vibrational amplitude can be directly observed as regions of high or low fringe visibility in the image of the surface. A brief analysis of the technique and some preliminary experimental tests are presented.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.