Patent ID: 6357281
Filing Date: 2002-03-19
Classification: G01N

Abstract:
A method for detecting rheological material properties comprising:harmonically exciting the material with at least one fundamental frequency &ohgr;1, measuring at least one parameter F that is variable in response to the harmonic excitation and is suitable for determining material properties of the material, by recording a time function F(t) of the parameter F, wherein said material properties are parameters of a Taylor series expansion or an analytical presentation of said material property depending on velocity or time, transforming by Fourier transformation the time function F(t) to form a shear spectrum in which said rheological material properties can be detected from the location of the frequency components, the intensity and/or function of the fundamental frequency &ohgr;1, and determining a shear velocity or shear rate function or the ratios of the intensities of the frequency components of the shear spectrum and comparing the result to predetermined limits or a demarcation or simulation criterion to detect a linear or nonlinear response.