Showing papers by "Domenica Paoletti published in 2002"
TL;DR: In this article, the Talbot effect with a Ronchi grating is applied to measurement of shift, and it is shown that by using a measurement procedure based on the Fourier transform, a cosine grating can be replaced by a Ronchis grating.
Abstract: In this study the Talbot effect with a Ronchi grating is applied to measurement of shift. It is shown that by using a measurement procedure based on the Fourier transform a cosine grating can be replaced by a Ronchi grating. Two different methods for data reduction and some experimental results are given.
58 citations
TL;DR: In this article, a digital laser speckle decorrelation method is proposed for the study of diffusion in transparent liquid mixtures and the diffusion constants may be deduced by a simple manipulation of the speckles decorrelation patterns recorded during the diffusion process.
15 citations
TL;DR: In this article, a digital white-light speckle system was proposed for measurements in free convection, and its application to free convective flows in liquids was presented and analyzed.
6 citations
19 Jun 2002
TL;DR: In this article, a portable electro-optic system was used to evaluate the state of conservation of ancient mosaics in laboratory and in situ, using ESPI and local speckle correlation techniques.
Abstract: Electronic Speckle Pattern Interferometry (ESPI) is a well-known tool in cultural heritage diagnostics. It can also reveal cracks and debonding of tiles in ancient mosaics of roman and medieval age. This paper describes a portable electro-optic system (it integrates the ESPI and local speckle correlation techniques) as a diagnostic tool to evaluate the state of conservation of ancient mosaic. Some experiments are been carried out on real, ancient, mosaics in laboratory and in situ.
2 citations
22 May 2002
TL;DR: In this article, an Electronic Speckle Pattern Interferometry (ESPI) technique is proposed for studying vibration of piezoceramic/nickel circular laminated plates.
Abstract: Today, the vibration analysis of laminated structures represents an important field in engineering metrology. To perform non-invasive vibration measurements in industrial environments, optical methods are a preferable choice. Electronic Speckle Pattern Interferometry is a method, which permits full field and non-contacting displacement or deformation measurements. The experimental measurement of the resonant frequencies for the piezoceramic material is generally performed by impedance analysis. In this work, Electronic Speckle Pattern Interferometry (ESPI) technique is proposed for studying vibration of piezoceramic/nickel circular laminated plates. The circular membrane is a composite made of a nickel alloy disk with thickness 0. 1 mm and diameter 32 mm, to which a piezoceramic disk, with the same thickness and a smaller diameter (24 mm) is bonded. The time average frame subtraction technique is improved by subtracting two Bessel fringe patterns at two different amplitude levels. A brief analysis of the techniques and some preliminary experimental tests are presented.
1 citations