METHOD AND DEVICE FOR MEASURING VISCOSITY OF LIQUID CRYSTALS Russian patent published in 2006 - IPC G01N11/04 

FIELD: measuring technique.

SUBSTANCE: method comprises pumping the liquid crystal from one tank to another under the action of the excess pressure through a flat capillary whose walls orient the molecules of the liquid crystal with respect to the direction of the flow, which is different for measuring different values of viscosity, measuring intensity of light passing through the layer of liquid crystal in crossed polaroids, finding the time dependence of the phase lag, determining the characteristic time of the flow from the results obtained, and calculating the viscosity. To obtain four different values of viscosity, the procedure is repeated four times for four different capillaries. The device comprises four flat capillaries with various initial orientations in the basic part of the capillary and homeotropic orientation in the remainder part of the capillary which is used for precise measurements.

EFFECT: enhanced accuracy and reduced sizes.

4 cl, 1 dwg