Local correlation of laser speckle applied to the study of salt efflorescence on stone surfaces
A local modification of a rough profile of a scattering surface produces a change in the corresponding part of its speckle image. This effect is employed to monitor the micro-structural changes during ageing of a stone specimen by salt crystallisation cycles. A measure of local correlation is derived from the digital difference of speckle patterns. The 2D map of speckle correlation reveals interesting aspects of the efflorescence mechanism.
Bibliographic Reference: Article: Optics Communications, Vol. 104 (1993) pp. 35-38
Record Number: 199410368 / Last updated on: 1994-11-28
Original language: en
Available languages: en