In this paper, we introduce a newly developed semi-analytical model to predict the TFM amplitude sensitivity map for both non-directional and directional flaws. For complicated acoustic paths which involve multiple interface interactions and wave-mode conversions, a knowledge of the Acoustic Region of Influence (AROI) enables an inspector to refine the scan plan to maximize the signal-to-noise ratio of the resultant TFM image and increase the probability of flaw detection. The accuracy of this new acoustic model was tested and validated by experiments using test blocks that contain side-drilled holes and flat-bottom holes. Results from the validation experiments show good agreement between the empirical TFM amplitude maps and theoretical AROI maps. The results also indicate that the model can be used to guide the selection of the optimal TFM inspection mode.
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