Sub-wavelength ultrasound characterization of composite material

A system comprising a memory and a processor, the memory to store a plurality of computer-executable instructions for execution by the processor, the computer-executable instructions comprising:

• record pulse data corresponding to an ultrasonic pulse that is emitted into a multi-layer structure of a material;
• record echo data corresponding to one or more echoes resulting from the ultrasonic pulse;
• define a matrix “φ” including time-shifting the pulse data by predetermined amounts;
• derive an echo vector “Y” from the recorded echo data;
• determine a solution vector “X” within a predetermined tolerance in accordance with the expression:
• Y=φ*X;
• and
• present the solution vector “X” as a B-scan display that represents the multi-layer structure of the material on a display device.

An apparatus comprising electronic circuitry, the apparatus comprising:

• a first component to obtain pulse data corresponding to an ultrasonic pulse emitted into a multi-layer structure of a material by a transducer;
• a second component to obtain echo data resulting from the ultrasonic pulse;
• a third component to derive one or more vectors including time-shifting the obtained pulse data by respective amounts;
• a fourth component to define a matrix “φ” including the one or more vectors;
• a fifth component to derive an echo vector “Y” from the obtained echo data;
• a sixth component to determine a solution vector “X” within a predetermined tolerance in accordance with the expression:
• Y=φ*X, the solution vector X stored at least temporarily in a memory of the apparatus;
• and
• a seventh component to present the solution vector X as a B-scan display that represents the multi-layer structure of the material on a display device.

A computer-readable storage media storing computer-executable instructions that when executed, cause one or more processors to perform acts comprising:

• derive one or more vectors including time-shifting a recorded pulse data by respective amounts, the recorded pulse data being derived from an ultrasonic pulse emitted into a multi-layer structure of a material;
• define a matrix “φ” including the one or more vectors;
• derive an echo vector “Y” from a recorded echo data;
• determine a solution vector “X” within a predetermined tolerance in accordance with the expression:
• Y=φ*X, the solution vector X stored at least temporarily in a memory accessible by the one or more processors;
• and
• present the solution vector X as a B-scan display that represents the multi-layer structure of the material on a display device.