Nondestructive testing (NDT) is normally used to sort manufactured parts, that is, to classify them as acceptable (good) or unacceptable (bad). While this is a valuable function for a manufacturer, the ultimate goal should be to eliminate (or at least significantly reduce) the number of bad parts that are produced — that is, monitor the process so that when bad parts are produced, the operator is notified and the process can be fixed. We describe an approach using process compensated resonant testing as a process control tool to provide the required feedback to the operator. Keywords: process control, statistical process control, Mahalanobis

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