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Combined digital-DOE holographic interferometer for force identification in vibroacoustics

Abstract : 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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Submitted on : Tuesday, January 8, 2019 - 4:27:51 PM
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Julien Poittevin, Charly Faure, Julien Le Meur, Pascal Picart, Charles Pezerat, et al.. Combined digital-DOE holographic interferometer for force identification in vibroacoustics. SPIE Photonics Europe, Apr 2018, Strasbourg, France. Proceedings of SPIE, the International Society for Optical Engineering, 10677 (Unconventional Optical Imaging), 2018, ⟨10.1117/12.2307632⟩. ⟨hal-01974226⟩



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