15 May 2017 Speckle noise reduction in single-shot holographic two-wavelength contouring
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Abstract
We present an experimental configuration that enables form measurement from a single-shot camera exposure. It combines two-wavelength contouring with spatial multiplexing synthetic-aperture digital holography. The synthetic-aperture in this work is formed by simultaneously illuminating the test object from two different angles. The two illumination directions and the two-wavelength contouring result in four holograms which are spatially multiplexed on a single camera target avoiding unwanted cross-interference between them by means of coherence gating. In contrast to standard holographic contouring methods, the proposed technique reduces speckle decorrelation noise and enables single shot form measurement. To demonstrate this technique, the shape of a micro cold drawing part is determined.
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Mostafa Agour, Reiner Klattenhoff, Claas Falldorf, Ralf B. Bergmann, "Speckle noise reduction in single-shot holographic two-wavelength contouring", Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102330R (15 May 2017); doi: 10.1117/12.2264971; https://doi.org/10.1117/12.2264971
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