An apparatus for measuring an optical anisotropy of an object to be examined, such as a liquid crystal, based on an interaction of an evanescent wave occurring during total reflection of a beam with the object is disclosed. The apparatus includes a transparent member having a curved surface...http://www.google.de/patents/US5838453?utm_source=gb-gplus-sharePatent US5838453 - Apparatus and method for measuring optical anisotropy
