Digital holographic tomography turbulence measurements

An apparatus, comprising:

• a laser system that generates a source beam and a reference beam;
• a diffraction grating configured to generate multiple test beams from the source beam;
• input optic elements configured to direct the multiple test beams through a test volume containing a test article such that the multiple test beams propagate at different angles through the test volume;
• output optic elements configured to project the multiple test beams onto a detector for interference with the reference beam such that at least the multiple test beams are defocused on the detector and a pixel saturation of the detector is avoided;
• and
• the detector configured to provide a digital representation of the interference to a processing system for measuring turbulence associated with at least the test article.

An apparatus, comprising:

• program instructions stored on one or more non-transitory computer readable storage media, the program instructions executable by a processing system to direct the processing system to at least:
• receive a digital representation of an interference pattern obtained by an optical detector and generated by at least interfering a reference beam with multiple test beams that propagate at different angles through a test volume containing a test article such that a pixel saturation of the optical detector is avoided by at least having the multiple test beams defocused as projected on the detector;
• process the digital representation and indications obtained of the different angles to determine path-resolved turbulence measurements;
• and
• provide the path-resolved turbulence measurements associated with at least the test article.