17 June 2009 Dynamic holographic interferometry for dilatation measurements in a vacuum-thermal environment
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In the past, we developed a holographic interferometry technique based on photorefractive materials for high resolution measurement of structures deformation. In this paper we present the early results of development of a holographic technique and facility for deformation and expansion measurement of aerospace composites components. Here the holographic technique consists in using several illumination beams for retrieving different components of the displacement vector. In our case the components and structures to be measured in the future will undergo temperatures excursions up to 150°C typically. Since holographic techniques are sensitive to air turbulences, it is necessary to place the samples in a vacuum chamber. We will present some early examples of measurements with this facility, obtained for temperatures excursions ranged between ambient and 29°C as first steps before going further to higher temperatures excursions.
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C. Thizy, C. Barbier, P. Barzin, I. Tychon, S. Roose, Y. Stockman, and M. Georges "Dynamic holographic interferometry for dilatation measurements in a vacuum-thermal environment", Proc. SPIE 7389, Optical Measurement Systems for Industrial Inspection VI, 73891P (17 June 2009); doi: 10.1117/12.828153; https://doi.org/10.1117/12.828153

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