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    Experimental approach toward holographic interferometric fringe interpretation (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Current literature concerning the measurement of small displacements by the laser holographic technique was reviewed. It was found that existing theories are extremely difficult, if not impossible, to apply to any realistic nondestructive testing conditions in which the geometries of the objects are complex and the three-dimensional displacements are irregular. An experimental approach was adopted for interpreting correlation between real time holographic fringe patterns and small displacements. Preliminary results show that the present method is feasible for the quantitative interpretation of the fringes as well as the calibration of the mobile HNDT system.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-120707 , BER-175-74
    Format: application/pdf
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