Reference : Vibration mode shapes visualization in industrial environment by real-time time-avera...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
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
Languy, Fabian mailto [Université de Liège > > CSL (Centre Spatial de Liège) >]
Vandenrijt, Jean-François mailto [Université de Liège > > CSL (Centre Spatial de Liège) >]
Thizy, Cédric mailto [Université de Liège > > CSL (Centre Spatial de Liège) >]
Rochet, Jonathan mailto [> >]
Loffet, Christophe mailto [> >]
Simon, Daniel mailto [> >]
Georges, Marc mailto [Université de Liège > > CSL (Centre Spatial de Liège) >]
Optical Engineering: the Journal of the Society of Photo-Optical Instrumentation Engineers
International Society of Optical Engineering
Special Section on Speckle-Based Metrology
Yes (verified by ORBi)
[en] Shearography ; Long wavelength infrared ; Interferometry ; Speckle pattern
[en] 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.
Centre Spatial de Liège - CSL
Service public de Wallonie : Direction générale opérationnelle de l'économie, de l'emploi et de la recherche - DG06

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