Preparatory Notes for ASNT NDT Level III Examination - Ultrasonic Testing, UT

The Thompson-Gray Measurement Model, which makes very accurate
predictions of ultrasonic scattering measurements made through liquid-solid
interfaces, does not attempt to model transducer electrical-mechanical
response. The Thompson-Gray Measurement Model approach makes use of
reference data taken with the same transducer(s) to deconvolve electrophysical
characteristics specific to individual transducers. See Section 5.4
Thompson-Gray Measurement Model.
The long term goal in ultrasonic modeling is to incorporate accurate models of
the transducers themselves as well as accurate models of pulser-receivers,
cables, and other components that completely describe any given inspection
setup and allow the accurate prediction of inspection signals.