Apparatus for the projection of fringe-like light patterns

Details Apparatus for the projection of fringe-like light patterns Apparatus for the projection of fringe-like light patterns

1994-12-12

1997-11-25

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

349 57, 349110, 349142, 356376, G02F 113, G02F 11343, G01B 1124

Patent

active

056917848

ABSTRACT:
An apparatus for the generation of different given fringe-like light patterns in space is disclosed. The light patterns are predominantly used in optical metrology, for the three-dimensional acquisition of the shape of objects. Said light patterns are generated by astigmatic projection of a specially designed mask with sub-areas, the brightness of said sub-areas can be controlled, for example by implementing the mask as a liquid crystal light valve. The sub-areas are controlled in a way that by combination of bright and dark sub-areas, different sub-masks are formed. The astigmatic projection of any sub-mask generates one of the given fringe-like light patterns. In spite of the binary transparency of the sub-masks, continuously varying brightness can be achieved. All necessary sub-areas are located on the same area, interlaced such as in a mosaic work. On this area, any of the required sub-masks can be generated.

REFERENCES:
patent: 3727527 (1973-04-01), Borowski et al.
patent: 5039210 (1991-08-01), Welstead et al.
patent: 5175601 (1992-12-01), Fitts
patent: 5339154 (1994-08-01), Gassler et al.
patent: 5372502 (1994-12-01), Massen et al.
patent: 5581352 (1996-12-01), Zeien

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