7 December 2017 Spatial multiplexing digital holography for 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 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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Mostafa Agour, Mostafa Agour, Reiner Klattenhoff, Reiner Klattenhoff, Claas Falldorf, Claas Falldorf, Ralf B. Bergmann, 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 . Submission: Received: 19 June 2017; Accepted: 15 November 2017
Received: 19 June 2017; Accepted: 15 November 2017; Published: 7 December 2017
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