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FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

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PLANE OF<br />

CRACK<br />

100<br />

20 40 60 60<br />

SAW Frequency (MHz)<br />

1OO<br />

Fig. 4. The detectability of surface cracks in silicon<br />

nitride by leaky Rayleigh waves as the function of frequency.<br />

EXPERIMENTAL<br />

(KNOOPCRACK)<br />

40<br />

60<br />

80<br />

I00<br />

I40<br />

THEORETICAL •<br />

20<br />

160 ISO' ANGLE OF<br />

INCIDENCE<br />

CNORMAL<br />

/ ÄCOUSTI)<br />

REFLATI<strong>ON</strong><br />

.COEFFICIENT<br />

Fig. 5. The experimental data obtained for the acoustic reflection of a Knoop<br />

indentation at different orientations compared to the theoretical curve obtained

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