Micro-Rheology using MultiSpeckle DWS with video camera Application to rheological properties

Microrheology is based on the Diffusing Wave Spectroscopy method that relates the particle dynamics to the speckle field dynamics, and further to the relative visco-elastic moduli G' and G'' with respect to frequency. For the study of the rheological properties we show that the robust measurement of speckle correlation using the inter image distance can bring useful information for industry on viscoelasticity variations over a wide range of frequency without additional parameter. Mots clefs : rheologie, DWS, speckle, micro-rheologie