Title:
SURFACE INSPECTION METHOD FOR METAL MATERIAL, SURFACE INSPECTION APPARATUS FOR METAL MATERIAL, AND METAL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2023/166898
Kind Code:
A1
Abstract:
A surface inspection method for a metal material according to the present invention is a surface inspection method for a metal material of optically detecting a surface defect of the metal material, the surface inspection method including: an irradiation step for irradiating a surface of a metal material with light; an image-capturing step for capturing images of reflected light from the surface of the metal material by the light irradiated in the irradiation step in two or more different wavelength bands to acquire a plurality of images; and a detection step for detecting a surface defect existing on the surface of the metal material from information of relative signal strength between the plurality of images obtained at the same position on the surface of the metal material in the image-capturing step.
Inventors:
NIIZUMA YUYA (JP)
ONO HIROAKI (JP)
ONO HIROAKI (JP)
Application Number:
PCT/JP2023/003026
Publication Date:
September 07, 2023
Filing Date:
January 31, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
G01N21/892
Domestic Patent References:
| WO2013012106A1 | 2013-01-24 |
Foreign References:
| JP2010266430A | 2010-11-25 | |||
| JPH04113260A | 1992-04-14 | |||
| JP2018036175A | 2018-03-08 | |||
| JP2011191252A | 2011-09-29 | |||
| JPH11337502A | 1999-12-10 | |||
| JPH0431753A | 1992-02-03 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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