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This paper presents some of the results electronic speckle pattern interferometry (ESPI) measurements recently performed on ancient Italian paintings on wood at the restoration laboratories of the Opificio delle Pietre Dure (Florence, Italy). A novel portable instrument, sensitive to out of plane displacement in the range from 0.1 um to 10 um, has been developed in house and applied to inspect some paintings 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.

Additional information

Authors: LUCIA A C, JRC Ispra (IT);ZANETTA P M, JRC Ispra (IT);FACCHINI M, JRC Ispra (IT)
Bibliographic Reference: Article: Optics and Lasers in Engineering
Record Number: 199610041 / Last updated on: 1996-02-16
Original language: en
Available languages: en
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