Detection of ultra-fine surface irregularities on large measuring objects

Initial situation:

In many companies manual inspection of large metal surfaces is still in use, even though the precision of this method is restricted: Flatness irregularities on large surfaces cannot be identified by human eye; the same is valid for height deviations smaller than 500µ over a width of 2 – 3 m. Quality requirements for industrial metal plates however have increased, particularly with respect to homogenous flatness, thickness and absence of surface irregularities. These requirements by conventional manual measuring methods cannot be met.

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