Phase shifting speckle interferometry for dynamic phenomena.
The paper presents an algorithm able to retrieve the phase in speckle interferometry by a single intensity pattern acquired in a deformed state, provided that the integrated speckle field is resolved in the reference condition in terms of mean intensity, modulation amplitude and phase. The proposed approach, called throughout the paper "one-step", can be applied for studying phenomena whose rapid evolution does not allow the application of a standard phase-shifting procedure, which, on the other hand, must be applied at the beginning of the experiment. The approach was proved by an experimental test reported at the end of the paper.
Department of Mechanical Engineering, University of Calabria, Ponte P. Bucci 44C, 87036 Arcavacata di Rende (CS), Italy. bruno@unical.it
Luigi
L
Bruno
Andrea
A
Poggialini
D000465:Algorithms; D003198:Computer Simulation; D007368:Interferometry / Q000379:methods*; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*