Speckle noise reduction in single-shot holographic two-wavelength contouring
| Autor: | Claas Falldorf, Mostafa Agour, Ralf B. Bergmann, Reiner Klattenhoff |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Contouring business.industry ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Holography Speckle noise 02 engineering and technology Holographic interferometry 01 natural sciences law.invention 010309 optics Speckle pattern 020210 optoelectronics & photonics Optics law Electronic speckle pattern interferometry 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Digital holographic microscopy business Digital holography ComputingMethodologies_COMPUTERGRAPHICS |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2264971 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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