Apparatus for separating specular from diffuse radiation
Patent 4861164 Issued on August 29, 1989. Estimated Expiration Date: 
November 10, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 10, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPanel surface flaw inspection Method of and apparatus for the measurement of the refractive-index profile in monomode optical fibres Patent #: 4664516 InventorAssigneeApplicationNo. 07/271396 filed on 11/10/1988US Classes:356/445, OF LIGHT REFLECTION (E.G., GLASS)356/237.2, Surface condition356/446With diffusionExaminersPrimary: Evans, F. L.Attorney, Agent or FirmInternational ClassesG01N 21/89 (20060101)G01J 1/42 (20060101) G01N 21/88 (20060101) Foreign Application Priority Data1986-09-05 GBAbstractAn optical inspection system for determining various features of, for example, painted surfaces, by analyzing light reflected from the surface in a plurality of ways. In one case the cross sectional diameter of a beam of radiation, which gives information regarding the surface, is measured by passing the beam through a filter means (104) having transmissive and absorptive portions (107,108), the arcuate width at each radial distance from the optical axis (100) being such that there is a predetermined relationship between the diameter of the beam and the amount of radiation passed by the filter. | |
