title: Measurement of piezoelectric transformer vibrations by digital holography.
abstract: A method for the measurements of the out-of-plane displacement on the surface of vibrating object is presented herein. This method is based on frequency-shifted time-averaged digital holographic interferometry, employing the principle of phase shifting. This approach allows for significant noise reduction, which results in high sensitivity of measurements. This method makes it possible to measure vibrations with amplitudes in the nanometer range over the whole measured surface. This method was applied to the visualization of the out-of-plane vibration modes of piezoelectric transformers. The amplitude and modal shapes were measured with a very high resolution. Furthermore, aspects influencing the measurement errors are discussed and the measurement results by holographic method were compared with the well-established single-point laser interferometry measurement method.
authors.affiliation: Institute of Mechatronics and Computer Engineering, Technical University of Liberec, Liberec, Czech Republic. pavel.psota@tul.cz
authors.forename: Pavel
authors.initials: P
authors.lastname: Psota
authors.forename: Vít
authors.initials: V
authors.lastname: Lédl
authors.forename: Roman
authors.initials: R
authors.lastname: Dolecek
authors.forename: Jirí
authors.initials: J
authors.lastname: Erhart
authors.forename: Václav
authors.initials: V
authors.lastname: Kopecký