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Hovanesian Rochester, Michigan 48309Kalamazoo, Michigan 49008 A modified shearographic (speckle -shearing) method for the rapid detection of residual stress in elastic engineering materials and components has been introduced. A coherent monochromatic light source (laser) is required to enable interference fringes to appear in the recording medium as a result of path length changes occurring between the two separate exposures during the evaluation.The path length change is a function of the objects surface displacement. The method employs a special image -shearing camera permitting quasi -full field measurement of surface displacement.

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