Method and apparatus for measuring a three-dimensional curved su

Details Method and apparatus for measuring a three-dimensional curved su Method and apparatus for measuring a three-dimensional curved su

1998-02-07

1992-04-07

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

250550, 250560, G01B 1124, G02B 2742

Patent

active

051022230

ABSTRACT:
A method and apparatus for measuring a three-dimensional curved surface shape based on a new measuring principle that a surface of an object to be measured is coded with information relating to a slit light which is used as a medium and moved or rotated at a constant speed. The manner in which a linear reflected pattern of the slit light is moved over the surface of the object to be measured is picked up by a television camera to form a composite image in which a value of each of picture elements in the image is represented by information relating to the slit light, e.g., a position, time or projection angle of the slit light at an instant that the slit light passes through one of positions on the object surface corresponding to that picture element. Then, a difference in value between each corresponding picture elements of the composite image and another composite image formed similarly with respect to a reference plane is determined to measure a three-dimensional curve surface shape of the object to be measured.

REFERENCES:
patent: 4158507 (1979-06-01), Himmel
patent: 4641972 (1987-02-01), Halioua et al.
patent: 4657394 (1987-04-01), Halioua
patent: 4687326 (1987-08-01), Corby, Jr.
patent: 4794262 (1988-12-01), Sato et al.
patent: 4794550 (1988-12-01), Greivenkamp, Jr.
patent: 4874955 (1989-10-01), Uesugi et al.
"Method and Its Instrumentation for 3-D Shape Measurement", Electronical Information Communication Institute, Oct. 1988 (Araki et al. )

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