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

Result code in 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>
Alternative codes found
RIV/46747885:24220/19:00009680
Result on the web
<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>

Result language
angličtina
Original language name
Absolute and pixel-wise measurements of vibration amplitudes using time-averaged digital holography
Original language description
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.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10306 - Optics (including laser optics and quantum optics)

Project
<a href="/en/project/GA16-11965S" target="_blank" >GA16-11965S: Adaptive acoustic metasurfaces for the active sound field control</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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