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Time-averaged phase-stepped ESPI with CO2 laser and shearography in the visible for identification of vibration mode shapes
Vandenrijt, Jean-François; Thizy, Cédric; Georges, Marc
2015In Mendoza Santoyo, Fernando (Ed.) SPECKLE 2015: VI International Conference on Speckle Metrology
Peer reviewed
 

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Keywords :
electronic speckle pattern interferometry; shearography; vibration analysis; time-average; CO2 laser; microbolometer array; long-wave infrared
Abstract :
[en] We present investigation of interferometric methods for vibration mode identification to be applied on shakers in industrial environment. We consider long wave infrared ESPI in time-averaged mode with the use of phase-stepping which allows transforming Bessel fringes, typical to the time averaging, into phase values which provide a better way for identification of vibration mode shapes. The use of long laser wavelength allows measuring larger amplitudes of vibrations compared to what is achieved in visible light. Also longer wavelengths allow lower sensitivity to external perturbations. Time-averaged phase-stepped shearography in visible is also used as a compared alternative to LWIR ESPI for working in industrial environments. Although not demonstrated here, an interesting feature for the future investigations on LWIR ESPI is its potentiality of simultaneous temperature measurement during vibrations
Disciplines :
Physics
Author, co-author :
Vandenrijt, Jean-François  ;  Université de Liège > CSL (Centre Spatial de Liège)
Thizy, Cédric ;  Université de Liège > CSL (Centre Spatial de Liège)
Georges, Marc ;  Université de Liège > CSL (Centre Spatial de Liège)
Language :
English
Title :
Time-averaged phase-stepped ESPI with CO2 laser and shearography in the visible for identification of vibration mode shapes
Publication date :
August 2015
Event name :
SPECKLE 2015: VI International Conference on Speckle Metrology
Event organizer :
Centro de Investigaciones en Optica
Event place :
Guanajuato, Mexico
Event date :
24-26 Aug 2015
Audience :
International
Main work title :
SPECKLE 2015: VI International Conference on Speckle Metrology
Author, co-author :
Mendoza Santoyo, Fernando
Publisher :
SPIE, Bellingham, WA, United States
Collection name :
Proceedings of SPIE, Vol. 9660
Pages :
96600N
Peer reviewed :
Peer reviewed
Name of the research project :
A.O.C.
Funders :
Service public de Wallonie : Direction générale opérationnelle de l'économie, de l'emploi et de la recherche - DG06
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