Absolute and pixel-wise measurements of vibration amplitudes using time-averaged digital holography
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24220%2F19%3A00009680" target="_blank" >RIV/46747885:24220/19:00009680 - isvavai.cz</a>
Nalezeny alternativní kódy
RIV/61389021:_____/19:00510002
Výsledek na webu
<a href="https://www.sciencedirect.com/science/article/pii/S0143816618316737" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0143816618316737</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.optlaseng.2019.04.002" target="_blank" >10.1016/j.optlaseng.2019.04.002</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Absolute and pixel-wise measurements of vibration amplitudes using time-averaged digital holography
Popis výsledku v původním jazyce
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 2π 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.
Název v anglickém jazyce
Absolute and pixel-wise measurements of vibration amplitudes using time-averaged digital holography
Popis výsledku anglicky
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 2π 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.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10306 - Optics (including laser optics and quantum optics)
Návaznosti výsledku
Projekt
<a href="/cs/project/GA16-11965S" target="_blank" >GA16-11965S: Adaptivní akustické metapovrchy pro aktivní řízení zvukového pole</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
OPTICS AND LASERS IN ENGINEERING
ISSN
0143-8166
e-ISSN
—
Svazek periodika
121
Číslo periodika v rámci svazku
OCT
Stát vydavatele periodika
GB - Spojené království Velké Británie a Severního Irska
Počet stran výsledku
10
Strana od-do
236-245
Kód UT WoS článku
000473380600027
EID výsledku v databázi Scopus
2-s2.0-85064535887