Absolute and pixel-wise measurements of vibration amplitudes using time-averaged digital holography

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F19%3A00510002" target="_blank" >RIV/61389021:_____/19:00510002 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/46747885:24220/19:00009680

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0143816618316737?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0143816618316737?via%3Dihub</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>

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 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.

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 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

<a href="/cs/project/GA16-11965S" target="_blank" >GA16-11965S: Adaptivní akustické metapovrchy pro aktivní řízení zvukového pole</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Optics and Lasers in Engineering

ISSN

0143-8166

e-ISSN

—

Svazek periodika

121

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

236-245

Kód UT WoS článku

000473380600027

EID výsledku v databázi Scopus

2-s2.0-85064535887