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Proceedings Paper

Speckle noise reduction in single-shot holographic two-wavelength contouring
Author(s): Mostafa Agour; Reiner Klattenhoff; Claas Falldorf; Ralf B. Bergmann
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Paper 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.

Paper Details

Date Published: 15 May 2017
PDF: 9 pages
Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102330R (15 May 2017); doi: 10.1117/12.2264971
Show Author Affiliations
Mostafa Agour, Bremer Institut für angewandte Strahltechnik GmbH (Germany)
Aswan Univ. (Egypt)
Reiner Klattenhoff, Bremer Institut für angewandte Strahltechnik GmbH (Germany)
Claas Falldorf, Bremer Institut für angewandte Strahltechnik GmbH (Germany)
Ralf B. Bergmann, Bremer Institut für angewandte Strahltechnik GmbH (Germany)
Univ. of Bremen (Germany)


Published in SPIE Proceedings Vol. 10233:
Holography: Advances and Modern Trends V
Miroslav Hrabovský; John T. Sheridan; Antonio Fimia, Editor(s)

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