Angle measurements

Details Angle measurements Angle measurements

2011-07-12

2011-07-12

Lauchman, L. G (Department: 2877)

Optics: measuring and testing

Angle measuring or angular axial alignment

C356S152300, C359S619000

Reexamination Certificate

active

07978321

ABSTRACT:
Methods and devices for angle determination, and retroreflecting foils are presented. A retroreflecting foil (1) is arranged at a surface, an angle of which is going to be determined. The retroreflecting foil has a lens surface with a plurality of spherical microlenses (4) and a reflecting surface with a plurality of spherical mirrors (5) of a second main radius of curvature. The lens surface of the retroreflecting foil is illuminated, and transitions between darkness and light in radiation reflected from the retroreflecting foil, either upon changing a relative angle between the retroreflecting foil and the illuminating light or spatial transitions over the surface of the retroreflecting foil, are observed. An angle measure associated with the transitions is determined. The spherical mirrors present preferably at least one inner point (22) of a spherical mirror surface at which reflection according to the second main radius of curvature is prohibited.

REFERENCES:
patent: 1918705 (1933-07-01), Ives
patent: 4082426 (1978-04-01), Brown
patent: 6995836 (2006-02-01), Tondorf et al.
patent: 2007/0058260 (2007-03-01), Steenblik et al.
patent: 95/34006 (1995-12-01), None
patent: 00/34807 (2000-06-01), None
International Search Report dated Nov. 30, 2007, from corresponding PCT application.

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