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FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

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HEATING<br />

PULSES<br />

DETECTOR<br />

" -—FILTER<br />

LASER<br />

B<strong>ON</strong>DED<br />

LAYER<br />

SUBSTRATE<br />

Fig. 8 Basic principle of the thermoelastic interferometric<br />

method for detecting an unbond. A surface-heating<br />

pulse causes the layer to thermoelastically bend,<br />

while its vertical displacement is detected by a<br />

focused interferometer.<br />

.c-

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