A photograph of a laser speckle pattern will diffract light, and a doubly exposed negative, which has been shifted between exposures, will produce a Young's fringe pattern with the fringe spacing inversely proportional to the displacement. This effect is used to detect the in-plane displacements of tensile specimens and cracked specimens, and changes in length of aluminium crystals due to annealing.
No takes yet. Share an insight, caveat, or question.
Luxmoore et al. (1974) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: