Reflectance measuring apparatus for making contactless measureme

Details Reflectance measuring apparatus for making contactless measureme Reflectance measuring apparatus for making contactless measureme

1988-01-22

1990-04-24

Rosenberger, Richard A.

Optics: measuring and testing

By monitoring of webs or thread

356446, G01N 2186, G01N 2147

Patent

active

049195352

ABSTRACT:
The invention is directed to a reflectance measuring apparatus for making contactless measurements on structured test objects wherein the measuring result is independent of the distance of the test object within a difference range (d). The illumination arrangement and the measuring arrangement have a common center axis (z) which extends perpendicularly to the surface of the test object. At least the illumination arrangement or the measuring arrangement includes at least three radiation transmitters or three radiation receivers having optical axes arranged on at least one cone (c) concentric with respect to the common center axis (z). Of the set of radiation transmitters and the set of radiation receivers, one of the sets is configured to have a parallel ray bundle with a core area (k) and the other one of the sets is configured to have a bundle having a limited aperture with the area (m) covered by the limited aperture or apertures being smaller than the core area (k) within a distance range (d).

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