Special Section on Speckle-Based Metrology

Comprehensive time average digital holographic vibrometry

[+] Author Affiliations
Pavel Psota

Technical University of Liberec, Institute of Novel Technologies and Applied Informatics (NTI), Faculty of Mechatronics, Informatics, and Interdisciplinary Studies, Studentská 2, 461 17 Liberec, Czech Republic

Regional Centre for Special Optics and Optoelectronic Systems (TOPTEC), Institute of Plasma Physics, Academy of Sciences of the Czech Republic, Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic

Vít Lédl, Roman Doleček, Petr Vojtíšek

Regional Centre for Special Optics and Optoelectronic Systems (TOPTEC), Institute of Plasma Physics, Academy of Sciences of the Czech Republic, Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic

Pavel Mokrý, Jan Václavík

Technical University of Liberec, Institute of Mechatronics and Computer Engineering (MTI), Faculty of Mechatronics, Informatics, and Interdisciplinary Studies, Studentská 2, 461 17 Liberec, Czech Republic

Opt. Eng. 55(12), 121726 (Aug 25, 2016). doi:10.1117/1.OE.55.12.121726
History: Received April 30, 2016; Accepted August 1, 2016
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Abstract.  This paper presents a method that simultaneously deals with drawbacks of time-average digital holography: limited measurement range, limited spatial resolution, and quantitative analysis of the measured Bessel fringe patterns. When the frequency of the reference wave is shifted by an integer multiple of frequency at which the object oscillates, the measurement range of the method can be shifted either to smaller or to larger vibration amplitudes. In addition, phase modulation of the reference wave is used to obtain a sequence of phase-modulated fringe patterns. Such fringe patterns can be combined by means of phase-shifting algorithms, and amplitudes of vibrations can be straightforwardly computed. This approach independently calculates the amplitude values in every single pixel. The frequency shift and phase modulation are realized by proper control of Bragg cells and therefore no additional hardware is required.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Pavel Psota ; Vít Lédl ; Roman Doleček ; Pavel Mokrý ; Petr Vojtíšek, et al.
"Comprehensive time average digital holographic vibrometry", Opt. Eng. 55(12), 121726 (Aug 25, 2016). ; http://dx.doi.org/10.1117/1.OE.55.12.121726


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