In this paper the problem of interpreting holographic and speckle-pattern interference fringes is discussed. A general theory is described and it is shown how plane strain may be measured by use of holographic interferometry. Certain limitations inherent in holographic interferometry are elucidated and it is demonstrated how these are eliminated if speckle-pattern interferometry is used. In the final section of the paper a technique is described in which holographic or speckle-pattern interferometry is used to determine accurate values of Poisson's ratio and Young's modulus.
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