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在保偏光纤偏振轴的定位和对准技术中,侧视成像法为目前的主要方法。现有的侧视成像法对光强形貌特征具有较高要求,为了提高它们的通用性,提出了基于侧视光强相关峰锐度的定轴方法。该方法首先通过侧视光强曲线间的相关运算得到相关系数曲线,进而利用相关系数曲线的峰值尖锐程度作为特征值。相比于传统侧视成像法,该方法不受光强形貌特征的限制,因此具有更强的通用性。为了提高该方法的精度,对不同观测平面的定轴精度进行了比较,从而确定了具有理想定轴精度的观测平面范围。在此基础之上,对该方法的实际精度进行了实验验证,结果表明:利用该方法可以获得优于0.9°的定轴精度。
In the polarization-maintaining optical fiber polarization axis positioning and alignment technology, side-imaging method is the main method. The existing side-view imaging method has high requirements on the morphological features of light intensity. In order to improve their versatility, a method based on the sharpness of the side-light intensity correlation axis is proposed. The method first obtains the correlation coefficient curve through the correlation operation of the side light intensity curves, and then uses the peak sharpness of the correlation coefficient curve as the eigenvalue. Compared with the traditional side-view imaging method, the method is not limited by the characteristics of light intensity, so it has more versatility. In order to improve the accuracy of the method, the precision of the fixed axes of different observation planes was compared, so as to determine the observation plane range with the ideal axis accuracy. On this basis, the actual accuracy of this method is experimentally verified. The results show that the precision of the fixed axis better than 0.9 ° can be obtained by this method.