SURFACE DETECTION METHOD FOR STEEL PLATE HAVING RESIN COATING FILM AND SURFACE DETECTION DEVICE FOR SAME

Title:

SURFACE DETECTION METHOD FOR STEEL PLATE HAVING RESIN COATING FILM AND SURFACE DETECTION DEVICE FOR SAME

Document Type and Number:

WIPO Patent Application WO/2011/122185

Kind Code:

A1

Abstract:

The disclosed surface detection method for a steel plate having a resin coating film comprises: a step wherein sheet shaped light which has been linearly polarised at a specified polarisation angle is irradiated on a steel plate at an incidence angle which differs from the Brewster's angle of a coating film by at least a specified angle; and a step wherein linearly polarised light having a polarisation angle of 0 degrees is imaged at a light receiving angle which is staggered by a specified angle relative to the specular reflection angle of the incident light. Thus, the surface of a steel plate can be accurately detected without observing abnormalities on the coating film itself, and without the need to alter the light receiving angle and the incidence angle depending on resin components.

Inventors:

KAZAMA AKIRA (JP)
TANAKA KAORU (JP)
SAKAI JUN (JP)

Application Number:

PCT/JP2011/054266

Publication Date:

October 06, 2011

Filing Date:

February 25, 2011

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
KAZAMA AKIRA (JP)
TANAKA KAORU (JP)
SAKAI JUN (JP)

International Classes:

G01N21/892

Foreign References:

JP2008026060A	2008-02-07
JP2005189113A	2005-07-14
JP2002214150A	2002-07-31
JPH0894542A	1996-04-12
JPH11248642A	1999-09-17
JP2008026060A	2008-02-07
JP2002214150A	2002-07-31

Other References: