Characterization of Distortions Induced by a Flow or an Electric Field in Nematic Films Using Conoscopic Experiments

G. Waton Laboratoire d'Acoustique Moléculaire, Université Louis Pasteur, Institut de Physique, 4, rue Blaise Pascal, 67070, Strasbourg, Cedex, France

A. Ferre Laboratoire d'Acoustique Moléculaire, Université Louis Pasteur, Institut de Physique, 4, rue Blaise Pascal, 67070, Strasbourg, Cedex, France

S. Candau Laboratoire d'Acoustique Moléculaire, Université Louis Pasteur, Institut de Physique, 4, rue Blaise Pascal, 67070, Strasbourg, Cedex, France

J. N. Perbet THOMSON-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. 10, 91401, Orsay, France

M. Hareng THOMSON-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. 10, 91401, Orsay, France

Abstract

Homeotropic nematic films, distorted under either a Poiseuille flow or a destabilizing electric field have been investigated by means of conoscopic experiments. The experimental patterns are compared with those obtained from a computer procedure. This method allows a determination of the ratio k₃₃/α₂ of the Frank bend elastic constant to the Leslie shear torque coefficient.

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Characterization of Distortions Induced by a Flow or an Electric Field in Nematic Films Using Conoscopic Experiments

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Characterization of Distortions Induced by a Flow or an Electric Field in Nematic Films Using Conoscopic Experiments

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