Abstract
The effect of mode conversion on defect detection and size estimation in a billet from the time-of-flight (TOF) profile is evaluated by comparing the results of wave propagation simulations in an elastic wave field and a scalar wave field, in which only longitudinal waves propagate. As a result, the effect of mode conversion appears in the TOF profile Δτ and received waveform. TOF deviation increases when mode conversion is considered compared with considering only longitudinal waves. This tendency compensates the error in the previous experiment and simulation results. The consideration of the shear components will make simulations and defect size estimations more accurate.
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