Method and apparatus for measuring surface flatness

Details Method and apparatus for measuring surface flatness Method and apparatus for measuring surface flatness

1990-01-23

1992-10-06

Lall, Parshotam S.

Boots, shoes, and leggings

364550, 356371, 356237, 73104, G01N 1908, G01B 1130

Patent

active

051538440

ABSTRACT:
This invention relates to a method and apparatus for determining the flatness or planarity of a surface and, specifically, to a method and apparatus for determining the flatness or planarity of a surface using a computerized optics technique.

REFERENCES:
patent: 3439988 (1969-04-01), Breske
patent: 3885875 (1975-05-01), Rosenfeld et al.
patent: 4468120 (1984-08-01), Tanimoto et al.
patent: 4627733 (1986-12-01), Wada
patent: 4629319 (1986-12-01), Clarke et al.
patent: 4790660 (1988-12-01), Ito et al.
patent: 4805124 (1989-02-01), Krufka
patent: 4853777 (1989-08-01), Hupp
patent: 4859062 (1989-08-01), Thurn et al.
"Laser Guage Qualifies Class A Surfaces," published in Plastics World, Feb., 1988, on p. 92, discloses a surface analyzer available from Ashland Chemical Co., of Columbus Ohio.

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