Abstract
Heterodyne interferometry provides an accurate method of measuring specklegram halo fringes for strain analysis; however, when fringe contrast is less than unity, the uncorrelated portions of the fields generate a background scintillation that is a random function of specklegram and detector positions. In practice, this scintillation effect establishes the actual limits on the utility of heterodyne phase measurements, regardless of the accuracy with which they can be made. This effect has been analyzed for heterodyne holography, and these results are applied here to the derivation of a fundamental relationship between image resolution, gage length, strain resolution, and parameters related to fringe contrast and the readout system.
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