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FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

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- 22 -<br />

Un»hl«ld«d prob* - good biad«<br />

8hl*ld*d prob* - good bisd«<br />

Shlvldsd prob« - d*t*cllva blad«<br />

RESULTS WITH SCAN PATTERN FROM FIN TO ROOT - ?MH; proh.-<br />

Figure 5: Results of inspection of good and defective blades with 2 MHz<br />

shielded and unshielded probes.<br />

TITAMUM TUBE WITH MILD STEEL SUPPORT<br />

CHANNEL 1<br />

15OKH1<br />

PHASEC D6 OUTPUT:<br />

MIX<br />

CANCELLATI<strong>ON</strong> OF SUPPORT SIGNAL<br />

Figure 6: Illustration of cancellation of support plate signal by using<br />

dual frequency "mixing" of signals.

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