Fiber optic triangulation gage

Details Fiber optic triangulation gage Fiber optic triangulation gage

1989-05-18

1990-07-24

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 2, 356 4, 356376, G01C 300, G01C 500

Patent

active

049431579

ABSTRACT:
Methods and apparatus for determining the curvature of a surface by use of multiple discrete triangulation sensors are described. Robustness in the face of an extreme manufacturing environment is achieved by placing a triangulation light source and a detector at a remote, environmentally controlled location. Light is relayed from the remote source to each sensor head by a single mode optical fiber, which then projects a spot onto the surface under consideration. An image of the spot is formed in each sensor head, and is relayed back to the remote detector by a coherent bundle of fibers. Range to the surface at each sensor head is inferred by the position of each image as relayed by the coherent bundles, while curvature of the surface is determined by comparing ranges as measured at each sensor head. The optics contained in each sensor head are adapted to work well with specular, diffuse, opaque or transparent surfaces.

REFERENCES:
patent: 3792928 (1974-02-01), Poilleux
patent: 4201475 (1980-05-01), Bodlaj
patent: 4373804 (1983-02-01), Pryor et al.
patent: 4453083 (1984-06-01), Bohlander et al.
patent: 4645917 (1987-02-01), Penney et al.
patent: 4647209 (1987-03-01), Neukomm et al.
patent: 4766323 (1988-08-01), Franklin et al.
patent: 4789243 (1988-12-01), Mathur

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