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This paper deals with the initial results of the work aimed at the application of non-intrusive optical methods to the monitoring of the salt efflorescence formation mechanism on stone material. A new laser method based on the correlation of two subsequent images has been used. Local modification of the optically rough profile of a scattering surface produces a change in the corresponding part of its speckle image. A measure of local correlation is dervied from the digital difference of speckle patterns. The 2D map of speckle correlation reveals important aspects of the efflorescence mechanism.

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Authors: REALINI M, Politecnico di Milano, Centro CNR "Gino Bozza" (IT);TONIOLO L, Politecnico di Milano, Centro CNR "Gino Bozza" (IT);ZANETTA P, JRC Ispra (IT);ALBRECHT D, JRC Ispra (IT);FACCHINI M, JRC Ispra (IT)
Bibliographic Reference: Paper presented: III International Symposium on the Conservation of Monuments in the Mediterranean Basin, Venezia (IT), June 22-25, 1994
Availability: Available from (1) as Paper EN 38170 ORA
Record Number: 199410391 / Last updated on: 1994-11-28
Original language: en
Available languages: en