Spatial multiplexing digital holography for speckle noise reduction in single-shot holographic two-wavelength contouring

Mostafa Agour; Reiner Klattenhoff; Claas Falldorf; Ralf B. Bergmann

doi:10.1117/1.OE.56.12.124101

7 December 2017 Spatial multiplexing digital holography for speckle noise reduction in single-shot holographic two-wavelength contouring

Mostafa Agour, Reiner Klattenhoff, Claas Falldorf, Ralf B. Bergmann

Author Affiliations +

Optical Engineering, Vol. 56, Issue 12, 124101 (December 2017). https://doi.org/10.1117/1.OE.56.12.124101

Abstract

We present an experimental configuration that enables form measurement from a single-shot camera exposure. It combines two-wavelength contouring with spatial multiplexing digital holography. This is achieved 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 microcold drawing part is determined.

Citation Download Citation

Mostafa Agour, Reiner Klattenhoff, Claas Falldorf, and Ralf B. Bergmann "Spatial multiplexing digital holography for speckle noise reduction in single-shot holographic two-wavelength contouring," Optical Engineering 56(12), 124101 (7 December 2017). https://doi.org/10.1117/1.OE.56.12.124101

Received: 19 June 2017; Accepted: 15 November 2017; Published: 7 December 2017

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