Grooved surface defect detection apparatus

Details Grooved surface defect detection apparatus Grooved surface defect detection apparatus

1984-04-13

1986-12-30

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356369, 250562, G01N 2189

Patent

active

046325468

ABSTRACT:
A fault detecting apparatus for flat articles generates a line of light on the article which is imaged onto a photoreceiver via an optical system having cylindrical imaging characteristics. For use with an article 11 having light diffracting characteristics the line of light 12 is arranged substantially at right angles to the structure 13 which causes the light diffraction. The optical system 14 having cylindrical imaging characteristics detects, apart from the zero order at least also the first diffraction order of the light leaving the article. The light of the first diffraction order is also imaged onto its own photoreceiver (FIG. 1).

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patent: 4352564 (1982-10-01), Roach
patent: 4395122 (1983-07-01), Southgate et al.

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