Vibration mode separation of transient phenomena using multi-pulse digital holography

Philipp Froening; Giancarlo Pedrini; Hans J. Tiziani; Fernando Mendoza Santoyo

doi:10.1117/1.602312

1 December 1999 Vibration mode separation of transient phenomena using multi-pulse digital holography

Philipp Froening, Giancarlo Pedrini, Hans J. Tiziani, Fernando Mendoza Santoyo

Optical Engineering, Vol. 38, Issue 12, (December 1999). https://doi.org/10.1117/1.602312

A rectangular flat metal plate is made to randomly vibrate when excited by a shaker. A digital holographic interferometry out-ofplane optical system is used to investigate the temporal development of the induced transient deformations. The system relies on two and four laser pulses emitted within a single envelope of the flashlamp contained in the oscillator cavity of a ruby laser, and also on three CCD cameras used to record two or four digital images resulting from the same number of holographic interferograms. Hologram data reconstruction is performed digitally and Fourier evaluated to obtain quantitative deformation data for each of the formed interferograms. The deformation data is broken down into resonant mode components, sums of which are used to computer reconstruct the experimental deformation data. The error produced when using a finite sum of resonant mode components is considered. Experimental and computer reconstruction results for the transient vibration deformation of the plate are presented and compared.

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Philipp Froening, Giancarlo Pedrini, Hans J. Tiziani, and Fernando Mendoza Santoyo "Vibration mode separation of transient phenomena using multi-pulse digital holography," Optical Engineering 38(12), (1 December 1999). https://doi.org/10.1117/1.602312

Published: 1 December 1999

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