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FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

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m<br />

"O -30<br />

z<br />

o<br />

Ul -40<br />

u.<br />

Ul<br />

ce<br />

o<br />

o<br />

Ü<br />

-50<br />

-60<br />

- 315 -<br />

CRACK DEPTH (Aim)<br />

50MHz Ä * 112 um<br />

100 200 300<br />

10 20 30<br />

Ko<br />

Fig. 6. The acoustic reflection of various size<br />

Knoop indentations obtained by 50 MHz leaky Rayleigh waves.<br />

O<br />

0.<br />

<<br />

Ul<br />

Ul<br />

50 100<br />

FREQUENCY<br />

CRACK SIZE<br />

(/im)<br />

60 ^<br />

150<br />

Fig. 7. Spectra of different size Knoop<br />

indentations deconvolved by a reference signal.

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