Abstract
We describe a heterodyne readout system for the analysis of specklegrams arranged in the dual plate mode. We analyze the sources of error due both to the statistical nature of the detection scheme and to misalignement. In evaluating the contributions of the statistical errors we consider, besides the so called "scintillation noise", a recently described additional source called "speckle grain noise". With regard to the misalignment sources, the most critical parameters have been carefully analyzed to make the layout as insensitive as possible against drifts in the setting of the most crucial components. Tests have been performed with two identical specklegrams and the results show that the ultimate accuracy is only five times worst than the intrinsic noise limiting value.
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