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Absolute and pixel-wise measurements of vibration amplitudes using time-averaged digital holography
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SYSNO ASEP 0510002 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Absolute and pixel-wise measurements of vibration amplitudes using time-averaged digital holography Author(s) Psota, P. (CZ)
Mokrý, P. (CZ)
Lédl, Vít (UFP-V) RID
Stašík, Marek (UFP-V)
Matoušek, O. (CZ)
Kredba, J. (CZ)Number of authors 6 Source Title Optics and Lasers in Engineering. - : Elsevier - ISSN 0143-8166
Roč. 121, October (2019), s. 236-245Number of pages 10 s. Language eng - English Country NL - Netherlands Keywords interferometry ; Digital holography ; Time-averaged holography ; Scanning holography ; Vibration ; Phase modulation Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects GA16-11965S GA ČR - Czech Science Foundation (CSF) CZ.02.1.01/0.0/0.0/16_026/0008390 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000473380600027 EID SCOPUS 85064535887 DOI 10.1016/j.optlaseng.2019.04.002 Annotation This paper presents scanning time-averaged digital holography, a method for measuring the amplitude distributions of harmonically oscillating objects. Each intensity image reconstructed from the time-averaged digital hologram has the form of a set of fringes that follow a zero-order Bessel function of the first kind. Modulating the phase of the light beam in the interferometer results in shifts in the bright zero-order fringes with changes in modulation depth. The developed method is based on the continuous shift in the zero-order fringe over the object surface. The magnitude of the vibration amplitude is independently evaluated for each pixel. Unlike other digital holographic vibrometry methods based on spatial phase unwrapping or fringe counting, the proposed technique can measure vibration amplitudes without the risk of fringe number confusion or 2 pi errors. Thus, the new method can be used to measure high-slope amplitude distributions and discontinuous/partially shaded objects. The method was experimentally verified by measuring a bending piezo actuator, and the uncertainty of the method was determined to be in the range of nanometers. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2020 Electronic address https://www.sciencedirect.com/science/article/abs/pii/S0143816618316737?via%3Dihub
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