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Optical Engineering

Vibration mode shapes visualization in industrial environment by real-time time-averaged phase-stepped electronic speckle pattern interferometry at 10.6  μm and shearography at 532 nm
Author(s): Fabian Languy; Jean-François Vandenrijt; Cédric Thizy; Jonathan Rochet; Christophe Loffet; Daniel Simon; Marc P. Georges
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Paper Abstract

We present our investigations on two interferometric methods suitable for industrial conditions dedicated to the visualization of vibration modes of aeronautic blades. First, we consider long-wave infrared (LWIR) electronic speckle pattern interferometry (ESPI). The use of long wavelength allows measuring larger amplitudes of vibrations compared with what can be achieved with visible light. Also longer wavelengths allow lower sensitivity to external perturbations. Second, shearography at 532 nm is used as an alternative to LWIR ESPI. Both methods are used in time-averaged mode with the use of phase-stepping. This allows transforming Bessel fringes, typical to time averaging, into phase values that provide higher contrast and improve the visualization of vibration mode shapes. Laboratory experimental results with both techniques allowed comparison of techniques, leading to selection of shearography. Finally a vibration test on electrodynamic shaker is performed in an industrial environment and mode shapes are obtained with good quality by shearography.

Paper Details

Date Published: 1 June 2016
PDF: 9 pages
Opt. Eng. 55(12) 121704 doi: 10.1117/1.OE.55.12.121704
Published in: Optical Engineering Volume 55, Issue 12
Show Author Affiliations
Fabian Languy, Univ. de Liège (Belgium)
Jean-François Vandenrijt, Ctr. Spatial de Liège (Belgium)
Cédric Thizy, Univ. de Liège (Belgium)
Jonathan Rochet, V2i S.A. (Belgium)
Christophe Loffet, V2i S.A. (Belgium)
Daniel Simon, V2i S.A. (Belgium)
Marc P. Georges, Ctr. Spatial de Liège (Belgium)

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