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FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

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Transducer<br />

(Pulse-echo mode)<br />

- 103 -<br />

Transducer<br />

Edge shear waves / Converted<br />

Back converted compression wave<br />

shear wave<br />

Fig. 4 Experimental set-up to observe diffracted and converted waves.<br />

Fig. 5 Oscilloscope traces observed with the transducers shown in figure<br />

4. Top: pulse-echo signal from angled transducer - (the first pulse<br />

is parasitic). Bottom: echos from transducer directly above flaw -<br />

the first pulse is a direct reflection from the top surface,<br />

following pulses are reflections of mode-converted wave inside the<br />

plate.

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