Method and system of identifying a bond boundary between a sound bond and a weak bond in a multilayer article

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 trough number of troughs of the first waveform;
• counting a second trough number of troughs of the second waveform;
• determining, in response to 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.

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;
• calculating a first sum of the first peak number and the first trough number and a second sum of the second peak number and the second trough number, and
• determining, in response to the first sum being non-equal to the second sum, that there is a bond boundary between the first position and the second position.