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US 4,900,923 AGranted
Reflectance measuring apparatus including a cylinder-shaped light conducting device between the measuring aperture and the specimen
AssigneeCarl-Zeiss-Stiftung
InventorHermann Gerlinger
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Abstract
The invention is directed to a reflectance measuring apparatus having a predetermined aperture for the receiving optic. A light-conducting device arranged between the measuring aperture and the specimen enlarges the effective measuring surface of the latter so that even specimens having a large surface structure can be measured without difficulty.
Claims15
A reflectance measuring apparatus for measuring a specimen, the apparatus comprising:
- a structure defining a measuring aperture having a center;
- light source means for illuminating the specimen from which light radiation is reflected;
- receiver means for detecting the radiation reflected from the specimen within a predetermined aperture;
- a light-conducting device having a first longitudinal end placed on said measuring aperture and a second longitudinal end facing the specimen;
- said light-conducting device having a configuration which is at least approximately cylinder-shaped and defining a longitudinal axis perpendicular to the area of said measuring aperture so as to extend through the center thereof;
- and,
- said light-conducting device having a diameter and a length selected so as to not significantly change said predetermined aperture and so as to cause said second longitudinal end to define an enlarged measuring aperture for the specimen.
4 more elements
Dependencies are inferred from the claim text.