Abstract
This paper presents some of the results of ESPI measurements recently performed on ancient Italian paints on wood at the restoration laboratories of the Opificio delle Pietre Dure (Florence, Italy). A novel portable instrument, sensitive to out-of-plane displacement, has been developed in-house and applied to inspect some paints before and after repair. The ESPI system consists of a lightweight optical head mounted on a tripod, a semiconductor laser source, a PC unit for acquisition and processing of the speckle images, and a monitor for displaying the interferometric fringes in real time. The compactness of the system is based on the use of optical fibres, which allow a considerable reduction of optical elements and adjustments.
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