Optics: measuring and testing – Of light reflection
Patent
1989-04-20
1991-05-28
Rosenberger, Richard A.
Optics: measuring and testing
Of light reflection
356429, G01N 2186
Patent
active
050188674
ABSTRACT:
A method and apparatus for the visual inspection of at least partly specularly reflective surfaces, such as metal surfaces, which are in continuous motion, by means of a receiver apparatus (5) and an image-analysis apparatus (6). In order to eliminate from the image produced in the received apparatus (5) the uneven illumination caused by variations in the height and orientation of the surface (4) being inspected, the view angle (30) of the received apparatus is adjusted in such a manner that the length of the image of the source of light, formed by means of a perforated lens (3) in front of the source of light (1) is greater than the diameter of the input pupil of the lens of the received apparatus (5).
REFERENCES:
patent: 4568191 (1986-02-01), Barry
patent: 4756619 (1988-07-01), Gerlinger et al.
Scott, B. A., "Instrument for the Measurement of Specular Reflectivity of Bright Metal Surfaces", Journal of Scientific Instruments, vol. 37, (Nov. 1960), pp. 435-438.
Melsheimer et al., "Portable Visible-Infrared Reflectometer", Rev. Sci. Instrum, vol. 48, No. 4 (Apr. 1977), pp. 482-483.
Rautaruukki Oy
Rosenberger Richard A.
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