shearography
n.— «In shearography, the part being tested is illuminated by an expanding laser beam, and its image is taken with an image-shearing camera.…Two images are taken. One image is made of the part in the undeformed state, and a second image is made after deformation. The processed film produces a fringe pattern that depicts the gradient of the surface displacements due to the deformation.» —by Tom Drozda et al. Tool and Manufacturing Engineers Handbook (Vol 4: Quality Control and Assembly) June 1, 1986. (source: Double-Tongued Dictionary)
Further reading
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