shearography

n. a method of detecting surface defects using lasers. Subjects: English, Jargon

Editorial Note: This is most common in the aerospace industries.

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Citations: 1986 Tom Drozda et al. Tool and Manufacturing Engineers Handbook (Vol 4: Quality Control and Assembly) (June 1) 4 ed., p. 340: 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. 1988 William B. Scott Aviation Week & Space Technology (Dec. 5) “B-2 Bomber Development New Design, Production Tools Will Play Key Role in B-2 Cost” vol. 129, no. 23, p. 18: Skin-to-core bonding problems can be detected by the shearography technique through laser interferometry techniques. When a composite part is slightly stressed, a minor surface deflection in the material can be spotted by the laser, which produces a fringe pattern. 2005 Rosemarie Bernardo Star Bulletin (Honolulu, Hawaii) (July 31) “Damien grad aids effort to fix shuttle tank foam”: In the second project, Davis and his team developed a technique called “shearography” to ensure that foam will not come off the tank during launch and ascent. Shearography uses a laser to detect defects.

Posted 6 Mar 06 | Permalink | Tell a Friend