Method and apparatus for determining physical characteristics of

Details Method and apparatus for determining physical characteristics of Method and apparatus for determining physical characteristics of

1979-02-27

1981-12-15

Dixon, Harold A.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

250223B, 250563, 328112, G01M 2117

Patent

active

043056610

ABSTRACT:
A method of determining physical characteristics of a surface. Light or other electromagnetic radiation is directed onto a first portion of a surface and the reflected radiation is received such as by a photodiode. The radiation is also directed onto at least two further portions of the surface and located on either side of and proximate to the first portion. The radiation reflected by the further portions is also received. The radiation reflected from the first portion is compared with the radiation reflected from the two further portions. The radiation and comparison steps are repeated and the comparisons are used to determine a physical characteristic of the surface, such as the presence of one or more flaws. In another embodiment, light or other electromagnetic radiation is used to determine object dimension, such as bore dimension.

REFERENCES:
patent: 3209157 (1965-09-01), Bruck et al.
patent: 3299271 (1967-01-01), Stites
patent: 3399592 (1968-09-01), Brachvogel et al.
patent: 3409789 (1968-11-01), Cantella
patent: 3551061 (1970-12-01), Glowa
patent: 3637314 (1972-01-01), Groot
patent: 3919531 (1975-11-01), Bobel et al.
patent: 4027982 (1977-06-01), Ohishi
patent: 4042823 (1977-08-01), Decker
patent: 4165277 (1979-08-01), Frewin
"Method of Checking Wall Imperfections", by A. Heinz, Western Electric Tech. Digest No. 19, Jul. 1970, pp. 31, 32.

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