Autofocusing system and method for positioning an interferometri

Details Autofocusing system and method for positioning an interferometri Autofocusing system and method for positioning an interferometri

1995-04-27

1996-08-06

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

2502018, 356399, 356400, G01B 902, G01B 1100

Patent

active

055439152

ABSTRACT:
A two-phase autofocusing system (123,124) automatically and precisely positions an interferometric fringe (113') over a target (25') in an image (111a, 111b, 111c). The autofocusing system (123, 124) can be implemented in an automatic inspection system (90) for contactlessly measuring disparity between two surfaces, such as undercut or protrusion of an optical fiber (26) relative to a surrounding support material (36) at the endface (79) of an optical fiber termination (37). The inspection system (90) measures an offset of the fringe (113') at the target (25') in the image in order to determine the disparity. In structure, the inspection system (90) has a measurement apparatus (91) with an interferometer (98) controlled by a machine vision system (92) for determining the degree of disparity. Further, the machine vision system (92) employs the two-phase autofocusing system (123, 124).

REFERENCES:
patent: 4738507 (1988-04-01), Palmquist
patent: 4738508 (1988-04-01), Palmquist
patent: 4787698 (1988-11-01), Lyons et al.
"Checkmate F5 System Instruction Manual," Oyokoden Lab Co., Ltd. (at least as early as 1991).
"Norland Fiber Interferometer," Norland Products Inc., New Brunswick, NJ (1992).
"ZX-1 Zoom Interferometers," Direct Optical Research Company, Phoenix, AZ (at least as early as Jan. 1995).
"TOPO-3D Quick Tour Manual, " Wyko Corporation, Tucson, AZ., Ltd. (Feb. 1990).

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