Optical measurement system for articles with varying surface ref

Details Optical measurement system for articles with varying surface ref Optical measurement system for articles with varying surface ref

1993-10-18

1997-04-29

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

Triangulation ranging to a point with one projected beam

356 401, 356375, 451 6, G01C 300, G01B 1114, B24B 4912

Patent

active

056254466

ABSTRACT:
An electro-optical system for high speed measuring of the dimensions of a multiplicity of articles having varying part-to-part surface reflectivity comprises impinging a modulated intensity light beam on each individual article, where the intensity of the beam impinged on the article is varied in response to the image signal from a prior beam impingement. The intensities of image signals from all articles are made comparatively uniform, to improve accuracy. Preferably, light intensity is modulated for each individual article at a speed commensurate with less than 0.004 second pass-by intervals by phase shifting a polarized laser light beam using a Pockel Cell type electro-crystallographic device. The system is particularly useful in grinding the tips of blades of gas turbine engine rotors while the blades are mounted in a spinning rotor.

REFERENCES:
patent: 3679307 (1972-07-01), Zoot et al.
patent: 4326804 (1982-04-01), Mossey
patent: 4501095 (1985-02-01), Drinkuth et al.
patent: 4512115 (1985-04-01), Miller
patent: 4765742 (1988-08-01), Davinson
patent: 4771182 (1988-09-01), Fulkerson
T. Higgins, "There is a lot more to an A-O modulator than meets the eye" Laser Focus World, Jul. 1991, pp. 133-142.
R. Goldstein "Electro-Optic Devices in Review" Lasers and Applications Apr. 1986.
Lasermetrics, Inc. "Technical/and Operation Manual for Transverse Field Electro-Optic Light Modulators" circa 1973.

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