| CPC G01N 29/069 (2013.01) [B23K 20/08 (2013.01); B23K 31/125 (2013.01); G01N 29/07 (2013.01)] | 15 Claims |
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1. A method of identifying a bond boundary between a sound bond and weak bond in an article having a first layer and a second layer, the method comprising:
determining a plurality of positions on a surface of the article;
for each position of the plurality of positions, obtaining a full-wave, time domain waveform of ultrasonic waves reflected from the article;
for each pair of adjacent positions among the plurality of positions:
determining whether there is a bond boundary between a first position of the pair of adjacent positions and a second position of the pair of adjacent positions based on a comparison of a waveform characteristic of a first waveform generated at the first position and the waveform characteristic of a second waveform generated at the second position; and
in response to a determination that there is a bond boundary between the first position and the second position, determining a boundary position based on one or both of the first position and the second position and memorializing the boundary position;
wherein the determining whether there is a bond boundary between the first position and the second position comprises:
counting a first peak number of peaks of the first waveform;
counting a first trough number of troughs of the first waveform;
counting a second peak number of peaks of the second waveform;
counting a second trough number of troughs of the second waveform;
determining, in response to the first peak number being equal to the second peak number and the first trough number being equal to the second trough number, that there is not a bond boundary between the first position and the second position; and
determining, in response to the first peak number being unequal to the second peak number or the first trough number being unequal to the second trough number, that there is a bond boundary between the first position and the second position.
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