A. D'Altorio

Real-Time Holography For Microcrack Detection In Ancient Golden Paintings

An application of real-time holography to detect microcracks in ancient golden paintings is presented. The technique does not require sophisticated laboratory equipment and enables us not only to pinpoint the presence of a crack in embryo, inaccessible by more conventional methods of inspection, but also to monitor its growth in real time, giving, therefore, a valid aid to artworkers for determining the best conditions for the preservation of paintings.

Single-two hologram interferometry: a combined method for dynamic tests on painted wooden statues

It is shown that a combined system, utilizing sandwich real time holography with a CW laser can be used in artwork diagnostics to yield information about the state of conservation and the kinetic behaviour of a painted gesso wood statue, in response to ambient parameter variations (ambient drift). Such testing is an interesting and convenient engineering application of HNDT to artworks.

Sandwich hologram for displacement derivative

Abstract The suitability of sandwich holography for displacement derivative measurement is demonstrated. Holographic carrier fringes are produced by shearing one plate relative to the other in a sandwich pair. Some experimental results are presented.

Double exposure speckle-hologram for strain measurements in frescoes diagnostics

Abstract A simple technique using the characteristics of image-plane holography is suggested for strain measurement and for non-destructive testing. White light reconstruction is used. Some preliminary applications of the method in art conservation are presented.

An automatic measurement method for surface defects

A method for the detection and measurement of surface defects is described: it includes the use of a holographic contouring system and the application of digital image processing and automated computer analysis for quantitative information. Calibration tests on defects of known sizes have been carried out and the possibility of applying the method to studying the state of artwork conservation is examined.

Real And Nonreal Time Holographic Nondestructive Test (HNDT) For Painting Diagnostics

A holographic non destructive test procedure as a diagnostics tool in art conservation and preservation of ancient wooden panel paintings is presented. A brief discussion of the reability of the method is given. Some examples of experimental results are reported; they show that the defects can be detected in real and non real time on laboratory models, at varying depths,through ambient drift.The examination is made combining sandwich holography and real time holography, without any modification of holographic set up.

Holographic Study Of Liquid Diffusion : A New Approach

The suitability of sandwich holography for diffusion coefficient measurement in transparent liquid mixtures is demonstrated. Preliminary results concerning the NaCl-water diffusion system are presented.