Large displacement and deformation measurement by frequency sweeping digital holography

Pavel Psota; Vít Lédl; František Kaván; Ondřej Matoušek; Roman Doleček

doi:10.1117/12.2292846

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1 December 2017 Large displacement and deformation measurement by frequency sweeping digital holography

Pavel Psota, Vít Lédl, František Kaván, Ondřej Matoušek, Roman Doleček

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Proceedings Volume 10603, Photonics, Devices, and Systems VII; 106030C (2017) https://doi.org/10.1117/12.2292846
Event: Photonics Prague 2017, 2017, Prague, Czech Republic

Abstract

Recently, a digital holographic method called Frequency Sweeping Digital Holography (FSDH) for high precision measurements of surface topography of mechanical parts has been introduced. The greatest advantage of the presented FSDH is the fact that the measurement is absolute. i.e. optical path difference is independently retrieved in every single pixel. This approach can therefore be used also for measurement of large displacements and deformation. FSDH is particularly suitable in cases where the common digital holographic methods fail due to e.g. 2π unambiguity problem or speckle decorrelation. Measurement method principles, setup details, an some features of the method are discussed.

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Pavel Psota, Vít Lédl, František Kaván, Ondřej Matoušek, and Roman Doleček "Large displacement and deformation measurement by frequency sweeping digital holography ", Proc. SPIE 10603, Photonics, Devices, and Systems VII, 106030C (1 December 2017); https://doi.org/10.1117/12.2292846

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