Spatial multiplexing digital holography for speckle noise reduction in single-shot holographic two-wavelength contouring
| Autor: | Ralf B. Bergmann, Reiner Klattenhoff, Mostafa Agour, Claas Falldorf |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Contouring
Computer science business.industry Noise reduction ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION General Engineering Holography Speckle noise 02 engineering and technology 01 natural sciences Atomic and Molecular Physics and Optics law.invention Spatial multiplexing 010309 optics Speckle pattern 020210 optoelectronics & photonics Optics law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Digital holographic microscopy business Digital holography ComputingMethodologies_COMPUTERGRAPHICS Coherence (physics) |
| Zdroj: | Optical Engineering. 56:1 |
| ISSN: | 0091-3286 |
| DOI: | 10.1117/1.oe.56.12.124101 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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