Computational shear by phase stepped speckle holography

A computer program product having instructions stored on a non-transitory machine readable medium of a shearography system and executable by a processor of the shearography system that, when executed by the processor, causes a process to be carried out for generating at least one pair of simultaneous artificial specklegram images with each artificial specklegram image having a different shear length, the instructions of the computer program product comprising:

• receive a reflected beam from a target surface that is illuminated by a target illumination beam, wherein the reflected beam interferes with a first reference beam and a second reference beam;
• collect a data set received from a receiving optical component relative to the first and second reference beams;
• and
• generate a pair of simultaneous artificial specklegram images from the data set with each artificial specklegram image from the pair of simultaneous artificial specklegram images having different shear lengths.

A phase stepping speckle holography system, comprising:

• a transmitter;
• a target illumination beam transmitted by the transmitter to a target surface;
• a first reference beam transmitted by the transmitter;
• a second reference beam transmitted by the transmitter, wherein the second reference beam is phase shifted to 90 degrees;
• a receiver operable to receive a reflected beam from the target surface having been illuminated by the target illumination beam and to receive the first reference beam and the second reference beam from the transmitter;
• a processor operable to communicate with the receiver;
• and
• a computer program product having instructions stored on a non-transitory machine readable medium and executable by the processor that, when executed by the processor, causes a process to be carried out for generating at least one pair of simultaneous artificial specklegram images with each artificial specklegram image having a different shear length.