Time-averaged phase-stepped ESPI with CO2 laser and shearography in the visible for identification of vibration mode shapes

Jean-François Vandenrijt; Cédric Thizy; Marc P. Georges

doi:10.1117/12.2195337

24 August 2015 Time-averaged phase-stepped ESPI with CO₂ laser and shearography in the visible for identification of vibration mode shapes

Jean-François Vandenrijt, Cédric Thizy, Marc P. Georges

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Proceedings Volume 9660, SPECKLE 2015: VI International Conference on Speckle Metrology; 96600N (2015) https://doi.org/10.1117/12.2195337
Event: SPECKLE 2015: VI International Conference on Speckle Metrology, 2015, Guanajuato, Mexico

Abstract

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.

Citation Download Citation

Jean-François Vandenrijt, Cédric Thizy, and Marc P. Georges "Time-averaged phase-stepped ESPI with CO₂ laser and shearography in the visible for identification of vibration mode shapes", Proc. SPIE 9660, SPECKLE 2015: VI International Conference on Speckle Metrology, 96600N (24 August 2015); https://doi.org/10.1117/12.2195337

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KEYWORDS

Long wavelength infrared

Shearography

Cameras

Carbon dioxide lasers

Interferometry

Digital holography

Mirrors

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