Light-reflecting analytical device
AssigneeNCR Corporation
InventorJohn Franklin Hanny
Life of this patent
Estimating the term…
Abstract
A device is disclosed for spectral analysis of light reflected from liquid crystal materials. The device includes a light source, a liquid crystal material stage, and a scattered light receiving screen. In operation, the liquid crystal material stage and the scattered light receiving screen are submerged in a liquid having an index of refraction greater than about 1.2.
Claims10
A cholesteric liquid crystal testing device comprising a light absorbing mounting surface for receiving a film comprising cholesteric liquid crystal material, a light source directed to the mounting surface and adjustable to vary the angle of light incident on the mounting surface between about 20.degree. and about 70.degree., and a light reflecting surface located substantially perpendicular to the mounting surface to intercept light directed from the light source and scattered in a spectral hue from a film comprising cholesteric liquid crystals located on said mounting surface.
A process for testing the spectral response of a temperature sensitive, light scattering, cholesteric liquid crystal material comprising the steps of:
- (a) placing a film comprising the cholesteric liquid crystal material on a light absorbing mounting surface;
- (b) immersing the so-placed film in a fluid having an index of refraction between about 1.2 and 1.5;
- (c) directing a white light source into the fluid and onto the film at an angle of about 20.degree. to 70.degree. with a normal to the film;
- (d) intercepting at least a portion of the light reflected and scattered from the film onto a light reflecting surface located perpendicular to the mounting surface and immersed in the fluid.
Dependencies are inferred from the claim text.