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Invariant Worst-Case Interception of Indications during Nondestructive Testing Scanning

There is a need during nondestructive testing scanning to be assured that the smallest detectable discontinuity will generate the same response regardless of the initial scan position. In this Back to Basics, the requirements to assure a consistent discontinuity response in terms of beam size, discontinuity size and beam overlap during the scan are presented. The approach is to set the scanning overlap so that the largest possible response from a discontinuity is the same as the smallest possible response.

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