Abstract
Studies have been made of the influence of wearplate and coupling layer thickness on the measurement of ultrasonic velocity using commercially available highly damped transducers. The experimental measurements have been made as a function of coupling layer thickness using a pulse superposition method on samples of duraluminum and steel. A significant influence of coupling layer thickness, e, has been observed, particularly in the range 0 < e < λ 2 50 . This effect is strongly dependent on the characteristic impedance of the material being tested. The results obtained could be explained by considering the phase-shift, γ, arising between successive echoes from the reflection on the transducer—bond—sample interfaces. The phase-shift, γ, has been calculated from a model that takes into account the presence of the wearplate of the transducer.
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