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Theses

Caractérisation optique et étude de la stabilité d'un procédé de fibrage du verre

Abstract : In this PhD work several theoretical, numerical and experimental tools are developed to study the stability of a E-glass fibre drawing process. A phase Doppler interferometer and a high resolution diffractometer have been developed to determine the diameter of a fibre (D = 5 − 42μm) under drawing conditions (VelocityVf = 5 − 65m/s). These systems allow high resolutions measurements (0.35μm and 0.02μm respectively) thanks to the derivation of a rigorous model for the light scattering by a multilayered cylinder. This last model takes also into account various particular properties of these fibres : single-axis birefringence induced by the drawing stress, the refractive index dependence with the cooling rate, hollow fibres... The process is modelled by the drawing of a one dimensional and axi symmetrical viscous jet at high temperature. This model allows predicting various quantities such as the fibre's temperature and contraction profiles... under stationary or non stationary conditions. Preliminary experimental results, performed on a single fibre drawing bench, have shown that the stability of the drawing process is maximum for temperatures in the range T0 = 1145 − 1175◦C and for fibres with a diameter bellow D ≈ 15μm. Nevertheless, even under such conditions, the fibre's diameter
fluctuates periodically with a mean amplitude of σD/¯D ≈ 1.8%. The frequency of theses oscillations increases νosc = 0.5 → 0.9Hz with the temperature T0 = 1145 → 1250◦C. The mean rate of the diameter's fluctuations is about dσD/dt ≈ 1.9μm/s and dσD/dL ≈ 0.07μm/m (for Vf = 20m/s).
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Submitted on : Friday, June 13, 2008 - 2:11:49 PM
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Anne Lenoble. Caractérisation optique et étude de la stabilité d'un procédé de fibrage du verre. Physique [physics]. Université de Provence - Aix-Marseille I, 2004. Français. ⟨tel-00287935⟩

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