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Design of Experiments for Validating Probability of Detection Capability of NDT Systems and for Qualification of Inspectors

The capability of a testing system is established by application of various methodologies to determine the probability of detection (POD). One accepted metric of an adequate testing system is that there is 95% confidence that the POD is greater than 90% (90/95 POD). Design of experiments for validating probability of detection (DOEPOD) capability of nondestructive testing systems is a diagnostic tool providing detailed analysis of POD test data, guidance on establishing data distribution requirements and resolving test issues. DOEPOD demands utilization of observation of occurrences. The DOEPOD capability has been developed to provide an efficient and accurate methodology that yields observed POD and confidence limits for both hit/miss or signal amplitude testing. DOEPOD does not assume prescribed POD logarithmic or similar functions with assumed adequacy over a wide range of discontinuity sizes and testing system technologies, so multiparameter curve fitting or model optimization approaches to generate a POD curve are not required. DOEPOD applications for supporting inspector qualifications are discussed.

References
Department of Defense, MIL-HDBK-5H: Metallic Materials and Elements for Aerospace Vehicle Structures, US Department of Defense, 1998. Department of Defense, MIL-HDBK-1823: Nondestructive Evaluation System Reliability Assessment, US Department of Defense, 1999. Generazio, E.R., “Directed Design of Experiments for Validating Probability of Detection Capability of NDE Systems (DOEPOD),” Review of Progress in Quantitative Nondestructive Evaluation, D.O. Thompson and D.E. Chimenti, eds., Melville, New York, AIP, Vol. 27B, 2008, pp. 1693– 1700. Generazio, E.R., NASA LAR-17565-1 patent disclosure, National Aeronautics and Space Administration, 2009. Hald, A., Statistical Theory with Engineering Applications, New York, Wiley, 1952. NASA, MSFC-STD-1249: Standard NDE Guidelines and Requirements for Fracture Control Programs, National Aeronautics and Space Administration, 1985. NASA, NASA-STD-5009: Nondestructive Evaluation Requirements for Fracture Critical Metallic Components, National Aeronautics and Space Administration, 2008 Rummel, Ward D., “Recommended Practice for Demonstration of Nondestructive (NDE) Reliability on Aircraft Production Parts,” Materials Evaluation, Vol. 40, 1982, pp. 922–932. Rummel, Ward D. and George A. Matzkanin, NTIAC DB-97-02: Nondestructive Evaluation (NDE) Capabilities Data Book, third edition, NTIAC, 1997, Yee, B.G.W., F.H. Chang, J.C. Couchman and G.H. Lemon, NASA-CR- 134991: Assessment of NDE Reliability Data, National Aeronautics and Space Administration, 1976.
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