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US 7,742,168 B2Granted
Measuring a surface characteristic
AssigneeSurfoptic Limited
InventorsNick Elton, John Day
Life of this patent
Estimating the term…
Abstract
At least one surface characteristic of a sample, e.g. gloss, refractive index, micro-roughness, macroroughness, colour shift, is determined by illuminating a surface of the sample with a collimated beam of light at an angle to the plane of the surface and using an imaging detector to record an intensity and angular distribution image of the light from the beam reflected from the surface.
Claims33
A method for determining a surface characteristic of a sample, comprising the steps of:
- a) illuminating a surface of the sample with first and second collimated beams of light;
- and;
- b) using an imaging detector to record an intensity angular distribution image of the light from beams reflected from the surface,
- wherein said first and second collimated beams are selected from the group consisting of:
- beams having different incidence angles, beams having different polarization, and beams having different wavelengths.
2 more elements
Dependencies are inferred from the claim text.