Patent ID: 8508239

Claim:
A non-destructive signal propagation system to detect one or more defects in a substrate, the system comprising: a transducer to convert one or more frequencies from an electrical signal into at least one mechanical pulse, the at least one mechanical pulse to be coupled to the substrate; a plurality of sensors to be positioned on the substrate distal to the transducer, the plurality of distal sensors to detect the at least one mechanical pulse and any distortions to the at least one mechanical pulse received from a bulk of the substrate; and a signal analyzer coupled to the plurality of distal sensors to compare the detected at least one mechanical pulse and any distortions to the at least one mechanical pulse received from the bulk of the substrate with a baseline response, the baseline response being based on at least one of the following comparison tools where the comparison tools are selectable from a computational model, a known-good substrate, and a moving average of a plurality of substrates.