Optics: measuring and testing – Of light reflection – With diffusion
Patent
1987-07-06
1989-02-21
McGraw, Vincent P.
Optics: measuring and testing
Of light reflection
With diffusion
250227, 356371, G01N 2147, G01B 1130
Patent
active
048060186
ABSTRACT:
An angular reflectance sensor having no moving parts and capable of the essentially simultaneous measurement of the reflectivity of a surface at a plurality of angles. The sensor comprises a quarter pitch graded index lens (78) having first end face (82) and second end face (84) and an optical axis (86). Light is coupled from an optical source (72) to an input position (88) on the first end face. A plurality of detectors are provided, each detector having associated therewith an output position (97-99) on the first end face. Each detector comprises a photodetector (74-76) and a fiber optic cable (94-96) for coupling light from the associated output position to the photodetector. The second end face of the lens is positioned adjacent a surface. Light reflected from the surface at a particular angle is focused by the lens to a particular output position, and thus to a particular photodetector.
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McGraw Vincent P.
The Boeing Company
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