Local decorrelation of speckle patterns scattered by a surface is used for nondestructive evaluation of the state of conservation of wooden artifacts. Some experiments have been carried out on models with simulated internal flaws and on real, ancient, wooden panel paintings. The setup is very simple and can easily be used by nonoptically skilled operators.
SCHIRRIPA SPAGNOLO, G., Ambrosini, D., Paoletti, D. (1997). Image decorrelation for in situ diagnostics of wooden artifacts. APPLIED OPTICS, 36, 8358-8362 [10.1364/AO.36.008358].