Patent ID: 7489820

Claim:
Method for measuring the geometry and surface evenness of one side of a first moving metal strip and for measuring the geometry and surface evenness of one side of a second moving metal strip comprising: providing a moving first metal strip having a surface to be measured; providing a light source and a transparency between said light source and said surface of said first metal strip; producing a pattern on the surface of the first metal strip to be measured using said light source, wherein said light source produces a first pattern on the surface of the first metal strip with the aid of said transparency, viewing the pattern on said surface of said first metal strip with a camera; determining the geometry and surface evenness of said surface of said first metal strip; providing a moving second metal strip having a surface to be measured; providing said light source and said transparency between said light source and said surface of said second metal strip; producing a pattern on the surface of the second metal strip to be measured using said light source, wherein said light source produces a second pattern on the surface of the second metal strip with the aid of said transparency viewing the pattern on said surface of said second metal strip with a camera; and determining the geometry and surface evenness of said second metal strip.