Abstract

We describe the design, construction, and testing of a dual plate specklegram heterodyne readout system. The choice of the optical layout and mode of operation is based on the results of a detailed discussion on the sources of error associated both with optical noise and misalignments. Noise analysis includes the conventional scintillation noise and a recently described additional source, the speckle grain noise. Stability and reproducibility tests have been conducted and the accuracy of displacement measurement is 10⁻⁶ of the recorded specklegram size, approximately five times worse than the ultimate noise limited value.

© 1989 Optical Society of America

Range and accuracy of speckle displacement measurement in double-exposure speckle photography

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