第22卷第1期 2014年1月
文章编号
1004-924X(2014)01-0125-07
光学精密工程
Optics and Precision Engineering
保偏光纤对轴中的同轴度调节
张伟”，王乐锋，荣伟彬，孙立宁
Vol. 22No.1
Jan.2014
（哈尔滨工业大学机器人技术与系统国家重点实验室，黑龙江哈尔滨150080）
摘要：由于保偏光纤对轴时须保证旋转的光纤始终在显微镜的焦平面内，故本文设计了保偏光纤同轴度调节系统用于测转中心的距离，基于图像信息对二维手动平台实施调节，计算出调节后理论上的同轴度误差。结合显微视觉建立了实验系统。以电动平台旋转轴中心为原点建立直角坐标系，通过图像处理采用最小二乘法得到光纤中心线的直线方程，确定光纤中心与电动平台旋转中心的距离。将基于图像阔值的灰度差分函数作为清晰度函数，用实验方法确定其阔值，从而有效降低白噪声的影响。实验结果显示，经过调节的光纤和电动旋转平台的同轴度误差为3um，能够应用在保偏光纤偏振轴的检测中。
关键调：保偏光纤；同轴度调节，盈微视党；图像处理；清断度函数
中图分类号：TN25
文默标识码：A
doi;10.3788/OPE.20142201.0125
Coaxialadjustment inPMF alignments
ZHANG Wei',WANG Le-feng,RONG Wei-bin,SUN Li-ning
(State Key Laboratory of Robotics and System,Harbin Institute of Technology,Harbin 150080,China)
*Correspondingauthor,E-mail;&w062003163.com
Abstract: When polarization axes of Polarization Maintaining Fibers (PMF) are detected by micro-vi-sion methods in PMF alignment, the rotation axes of fibers must be in the focal plane of the micro-scope. Therefore, a coaxial adjustment system was designed to adjust the relative position of the fiber to a motorized rotation stage. The distance between the fiber core and the center of rotation stage was detected by the micro-vision and the precise motion of motorized linear stage, and then, based on the image information, the two-dimensional manual linear stages were used to perform the adjustment. After the adjustment, the coaxial error was computed theoretically. Based on the micro-vision,an ad-justment system was designed for the experiments. The Cartesian coordinate system was established by taking the center of the motorized rotary stage as the origin, Then, the equation of the straight line of the fiber center and its intercept were obtained by image processing and the least square method, further the distance between fiber center and rotary stage was determined. Moreover, the gray-scale difference function based on image threshold was taken as a sharpness function, and the influence of white noise was effectively eliminated. Experimental results show that the coaxial error between the
收稿日期：2013-07-04；修订日期：2013-07-19.
基金项目：国家自然科学基金资助项目（No.90923041)，长江学者和创新团队发展计划资助项目（No,IRT0915)；中
央高校基本科研业务费专项资金资助项目（No.HIT.BRET2.2010007）