System for detecting and locating surface discontinuity by a lig

Optics: measuring and testing – By polarized light examination – With light attenuation

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250202, G01B 1124

Patent

active

044139101

ABSTRACT:
The invention relates to a system for detecting and locating surface discontinuity by a light beam; it is more particularly intended for detecting any discontinuity forming a line on this surface, or any discontinuity forming two opposite lines on this surface. In the latter case, this discontinuity may, for example, be the join defined by the opposite edges of two metal sheets to be welded.

REFERENCES:
patent: Re30938 (1982-05-01), Kallen
patent: 2499178 (1950-02-01), Berry et al.
patent: 3518514 (1970-06-01), Moss
patent: 3527953 (1970-09-01), Chitayat
patent: 3609237 (1971-09-01), Gerber
patent: 3881102 (1975-04-01), Willits et al.
Norrie et al., "An Automatic Digital Curve Reader", Jr. Sci. Instrum., 1965, pp. 356-357.

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