Method of detecting flaws on the surface of metal
AssigneeDoryokuro Kakunenryo Kaihatsu Jigyodan
InventorsMasakazu Satoh, Miyuki Igarashi, Shigeo Senoo
Life of this patent
Estimating the term…
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.
Claims6
A method of detecting flaws on the surface of a metal material, comprising:
- directing a laser beam onto the surface of the metal material to be inspected for varying the position of impingement;
- passing the component of the beam which is directly reflected by the surface of the metal material and the component of the beam which is scattered by the surface of the metal material through a semitransparent filter having a rough surface;
- and
- separately measuring the changes in the quantity of light in said components of the reflected beam and the scattered beam and using the changes thus measured for detecting the presence of flaws on the surface of the metal material.
A method of detecting flaw on the surface of a metal material, comprising:
- directing a laser beam onto the surface of the metal material to be inspected for varying the position of impingement;
- reflecting the directly reflected component of the laser beam which is reflected from the surface of the metal material from a reflector having a rough surface;
- and
- measuring the change in the quantity of light in the beam reflected from said reflector and using the changes in the measuring quantities of light for detecting the presence of flaws on the surface of the metal material.
Dependencies are inferred from the claim text.