Application of Model Assisted Probability of Detection (MAPOD) to a Guided Wave SHM System

Abstract

This paper updates continued development on a study to generate Probability of detection (PoD) and Receiver Operating Characteristic (ROC) curves for a guided wave (GW) Structural Health Monitoring (SHM) system. PoD curves are used to access a detector’s performance as a function of damage size or equivalently the backscattered Energy to Noise Ratio (ENR). ROC curves present statistical representations of the reliability of the method for detecting certain size flaws versus their Probability of False Alarms (PFA). To a large extent, generating meaningful versions of these curves involves multiple repetitions of the same experiments while injecting as much realistic variability as possible. This paper examines the impact of a few key variables such as averaging and distance to flaw and how they can be applied to model assisted PoD