【作者】 黄桂铭；

【导师】 荣伟彬；

【作者基本信息】 哈尔滨工业大学 ， 机械工程， 2011， 硕士

【摘要】 光纤器件在光纤通信系统及光纤传感系统中是必不可少的器件。在光纤器件制造中采用超细径光纤不仅可以减小器件和相应部件的体积,而且可以提高器件性能。光纤直径的减小对光纤器件制作过程中的微张力检测提出了更高的要求,因此,研究超细径光纤微张力测量装置具有重要的应用价值。本文采用悬臂弯曲原理结合光电四象限测量方法,建立微张力测量模型,并通过噪声分析确定微力测量装置的分辨率同结构参数之间的关系。通过数值分析方法对微力测量装置的结构参数进行优化,在满足微力测量范围的前提下,计算出微力测量装置的最小分辨率以及相应的结构参数。根据优化参数建立微力测量装置并对其测量范围,重复精度和分辨率进行测试,通过最小二乘法对微力测量装置的输出信号进行拟合。采用有限元分析对超细径光纤在熔融拉伸过程中受到的电磁拉伸力的磁场进行仿真分析,通过数值分析对超细径光纤在熔融拉伸过程中受到的电磁力拉伸力同导线线径、线圈匝数、通电电流之间的关系进行拟合,得到超细径光纤熔融拉伸过程中受到的电磁拉伸力。基于粘弹性理论和麦克斯韦模型,建立超细径光纤熔融加热过程中微张力的理论模型。通过有限元分析对超细径光纤熔融拉伸过程中,超细径光纤的温度场和应力进行仿真分析。仿真结果表明,超细径光纤靠近高压加热电弧位置温度最高,两个电弧中间位置的光纤温度最低;超细径光纤熔融拉伸过程中应力随时间不断减小,超细径光纤靠近高加热电弧区域应力减小最多。建立超细径光纤熔融拉伸过程中微张力测量系统,利用标定后的微张力测量装置,测量超细径光纤的拉伸力和熔融拉伸过程中微张力的变化。通过改变超细径光纤熔融拉伸过程中的参数,测量不同参数对超细径光纤微张力的影响规律。实验结果表明,当拉伸速度一定时,光纤两端施加的初始拉力越大,拉伸结束时光纤拉力减小越多。当拉伸力一定时,光纤熔融拉伸的速度越大,拉伸结束时光纤拉力减小越多。更多还原

【Abstract】 Fiber devices are essential in fiber communication systems and various types of fiber sensing system. During the manufacture of fiber devices, it can not only reduce the volume of device and its corresponding parts, but also significantly improve device performance by using ultra-thin fiber. Reducing the diameter of fiber puts forward higher requirements to micro-tensile measurement during the process of fiber device production. Therefore, research on the device for measuring micro-tensile of ultra-thin fiber has important value for application.The paper which is based on the principle of cantilever-bending and photoelectricity four-quadrant measurement establishes the model of micro-force measuring device, and defines the relationship between the resolution and structural parameters by noise analysis. When the device for measuring micro-force meets the measurement range, Structure parameters are optimized by numerical analysis and the minimum resolution and structural parameters are calculated. The device based on the optimal results for measuring micro-force is built and measuring range, repeatability and resolution of the device is tested. The output signal of device by is fitted by least-squares method.The magnetic field which provides the tension for ultra-thin fiber is simulated by finite element analysis. The tension for ultra-thin fiber is obtained when the relationship between electromagnetic force and wire diameter, coil turns and current power is fitting by numerical analysis. Based on the theory of viscoelastic and the Maxwell model, the model on the micro-tensile when ultra-thin fiber is melt is established. The temperature and stress during the process of melting and stretching is by simulated by finite element analysis. The simulation results show that when the parts of ultra-thin which are near high-pressure heating arc position, the temperature is higher than any other part, and the temperature in the middle arc of two fiber-optic is minimum; the micro-tensile is reducing during the process of melting and stretching, and the micro-tensile of ultra-thin fiber which are near the high heating arc region reaches to the minimum.The system for measuring the micro-tensile of ultra-thin fiber during the process of melting and stretching is established and used for measuring both the micro-tensile and the change during the process of melting and stretching. By changing the parameters of the process for measurement, it can get the discipline of the tension of ultra-thin fiber. Experimental results show that the increasing of the initial micro-tensile strength, melting speed and the distance between measurement device and high heating arc region make micro-tensile decrease significantly.更多还原