Apparatus for separating specular from diffuse radiation

Details Apparatus for separating specular from diffuse radiation Apparatus for separating specular from diffuse radiation

1988-11-10

1989-08-29

Evans, F. L.

Optics: measuring and testing

Of light reflection

356237, 356446, G01N 2147, G01N 2155, G01N 2188

Patent

active

048611646

ABSTRACT:
An 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.

REFERENCES:
patent: 4629319 (1986-12-01), Clarke et al.
patent: 4664516 (1987-05-01), Coppa et al.

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