Method of detecting flaws on the surface of metal

Details Method of detecting flaws on the surface of metal Method of detecting flaws on the surface of metal

1978-09-22

1980-10-14

Corbin, John K.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356446, G01N 2100

Patent

active

042278090

ABSTRACT:
A method of detecting minute flaws on the surface of a metal material is provided, which is constituted by the steps of directing a laser beam onto the surface of the metal material, reflecting a component of the beam directly reflected by the surface of the material by a reflector having a rough surface, and measuring the change in the quantity of light in the beam reflected by said reflector. Alternatively, a component of the laser beam directly reflected by the surface of the material and a component of the laser beam scattered by the metal surface are passed through a semitransparent filter having a rough surface, and the change in the quantity of light in the beam passed through the filter is measured.

REFERENCES:
patent: 3702737 (1972-11-01), Mottier
patent: 3792268 (1974-02-01), Bjerke et al.
patent: 3931525 (1976-01-01), Clarke

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