24 May 2018 Combined digital-DOE holographic interferometer for force identification in vibroacoustics
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This paper presents the proof of principle of high-speed holographic measurements applied to solve an inverse problem in the domain of vibroacoustics. In order to get a robust and efficient set-up, a compact holographic interferometer which includes a Fresnel configuration equipped with a negative zoom for large surfaces and a diffractive optical element to improve the photometric efficiency of the set-up was developed. The vibration measurements from the digital holographic set-up are applied to the “RIFF” method which provides identification of the force distribution at the surface of the vibrating object, by solving a regularized inverse problem. Experimental results demonstrate the advantage provided by full-field measurements from multi-point holographic vibrometer with fine spatial and temporal resolutions.
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Julien Poittevin, Charly Faure, Julien Le Meur, Pascal Picart, Charles Pezerat, Kevin Heggarty, "Combined digital-DOE holographic interferometer for force identification in vibroacoustics", Proc. SPIE 10677, Unconventional Optical Imaging, 106773A (24 May 2018); doi: 10.1117/12.2307632; https://doi.org/10.1117/12.2307632

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