Počet záznamů: 1
Absolute and pixel-wise measurements of vibration amplitudes using time-averaged digital holography
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SYSNO ASEP 0510002 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Absolute and pixel-wise measurements of vibration amplitudes using time-averaged digital holography Tvůrce(i) Psota, P. (CZ)
Mokrý, P. (CZ)
Lédl, Vít (UFP-V) RID
Stašík, Marek (UFP-V)
Matoušek, O. (CZ)
Kredba, J. (CZ)Celkový počet autorů 6 Zdroj.dok. Optics and Lasers in Engineering. - : Elsevier - ISSN 0143-8166
Roč. 121, October (2019), s. 236-245Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova interferometry ; Digital holography ; Time-averaged holography ; Scanning holography ; Vibration ; Phase modulation Vědní obor RIV BH - Optika, masery a lasery Obor OECD Optics (including laser optics and quantum optics) CEP GA16-11965S GA ČR - Grantová agentura ČR CZ.02.1.01/0.0/0.0/16_026/0008390 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Omezený přístup Institucionální podpora UFP-V - RVO:61389021 UT WOS 000473380600027 EID SCOPUS 85064535887 DOI 10.1016/j.optlaseng.2019.04.002 Anotace 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. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2020 Elektronická adresa https://www.sciencedirect.com/science/article/abs/pii/S0143816618316737?via%3Dihub
Počet záznamů: 1