Patent ID: 8738307

Claim:
A method for measuring the viscosity of a material in a thin layer at least one measurement temperature Tm, comprising: the formation of a thin layer of said material on a substrate, the impression by molding or etching of a known geometrical pattern in the thin layer, the thin layer being in the solid state at the end of the impression step, a measurement of the initial topography of the impressed pattern over the entire length of the pattern along a determined direction, heating to said measurement temperature Tm for a determined creep time t flu , subsequent cooling to a solidification temperature of the thin layer, measurement of the topography resulting from the crept pattern, and mathematical processing of the topography measurements carried out by a computer processor in order to deduce therefrom a value of viscosity at the measurement temperature, outputting of a value of viscosity at the measurement temperature, wherein the impressed pattern of known geometry is a generally aperiodic pattern.