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Measurement of surface displacement normal to the line of sight

A system of contour lines representing the in-plane component of a surface displacement can be produced by either pre-exposure or post-exposure spatial-frequency filtering of the image of the surface

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Abstract

Two methods for measuring the displacement of a surface normal to the line of sight are described and experimental results presented. The displacement in either case may consist of a simple lateral or rotational shift of the body in total, or it may consist of small local displacements due to some type of mechanical stress. The displacement is displayed as a system of interference fringes over the image of the surface. The first method permits observation of the displacement fringes in real time; or, if a double exposure is recorded, the fringes can be observed directly on the doubly exposed photograph in white light. The second method requires spatial filtering of the image after recording a double exposure of the surface before and after displacement. However it permits selection of the component of displacement in any direction normal to the line of sight with a continuously variable sensitivity from the single (doubly exposed) transparency. Both methods are noncontacting, use only a single laser beam for illuminating the object and require no previously constructed grids or rulings.

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Authors and Affiliations

  1. Honeywell Information Systems, 73112, Oklahoma City, OK

    Donald E. Duffy

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  1. Donald E. Duffy
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Additional information

Work was prepared while the author was with the General Electric Co.'s Electronics Laboratory, Syracuse, NY.

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Duffy, D.E. Measurement of surface displacement normal to the line of sight. Experimental Mechanics 14, 378–384 (1974). https://doi.org/10.1007/BF02323565

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  • DOI: https://doi.org/10.1007/BF02323565

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