Method and system for measuring an inner diameter of a hole form

Details Method and system for measuring an inner diameter of a hole form Method and system for measuring an inner diameter of a hole form

1998-04-15

1999-06-01

Font, Frank G.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

356378, 356386, G01B 1102

Patent

active

059092840

ABSTRACT:
A light beam from a light source is formed into an annular beam and an inner wall of a hole in an object is illuminated with the annular beam. The annular beam reflected from the inner wall of the hole is received as an annular image and a diameter of the annular image is measured, from which an inner diameter of the hole can be determined

REFERENCES:
patent: 3806252 (1974-04-01), Harris et al.
patent: 3873211 (1975-03-01), Watson
patent: 4105925 (1978-08-01), Rossol et al.

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