制造过程中光纤几何形状的在线测量
Online measurement of optical fibre geometry during manufacturing
摘要：
光纤层（特别是涂层）的直径和同心度的在线测量是光纤制造中的挑战之一。目前可用的仪器可以离线测量层的同心度和直径，并且不适合实时精确监测或控制制造过程。在这项工作中，我们使用两个激光束，定位正交从两侧照射光纤，并通过分析散射图案计算偏离预期的几何形状。为了测量衍射图案，我们使用两个8K线性阵列探测器，散射光直接入射到传感器上。每个探测器捕获光纤正后方的大约90度角范围。两个测量通道位于不同的高度。散射模式的数学建模与有限元和傅立叶模态方法，与各种直径和同心度偏差。在散射图案的变化的灵敏度被确定相对于这些偏差。由于计算是计算密集型的，因此预先计算灵敏度，并且实时测量基于模式识别。图案的对称性用于区分直径和同心度变化。我们在生产条件下使用原型仪器进行了在线测量，并表明该方法足够灵敏，可以测量涂层直径和同心度的偏差小于1 μm。
英文摘要：
Online measurement of diameters and concentricities of optical fibre layers, and the coating layer in particular, is one of the challenges in fibre manufacturing. Currently available instruments can measure concentricity and diameter of layers offline, and are not suitable for precise monitoring or control of the manufacturing process in real time. In this work, we use two laser beams, positioned orthogonally to illuminate the fibre from two sides, and calculate deviations from the expected geometry by analysing the scattering pattern. To measure the diffraction pattern we use two 8K linear array detectors, with the scattered light incident directly on the sensors. Each detector is capturing approximately 90 degree angular range directly behind the fibre. The two measurement channels are positioned at different heights. The scattered pattern is modelled mathematically with finite-element and Fourier-modal methods, with various diameter and concentricity deviations. The sensitivities of the changes in the scattering pattern are identified in respect to these deviations. Since calculations are computationally intensive, the sensitivities are pre-calculated in advance, and the real-time measurement is based on pattern recognition. The symmetry of the pattern is used to differentiate between diameter and concentricity variations. We performed online measurements with the prototype instrument in production conditions, and show that this method is sensitive enough to measure deviations of under 1 μm in diameter and concentricity of the coating layer.
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