磁光玻璃光纤的偏振特性及其在电流传感器上的应用

【作者】 马静；

【导师】 杨瀛海；

【作者基本信息】 安徽大学 ， 光学， 2002， 硕士

【摘要】 本文研究了磁光玻璃光纤的偏振特性及其在光纤电流传感器中的应用。 介绍了磁光玻璃工作原理及概况，研制了磁光玻璃光纤，以ZF1磁光玻璃作为芯料，以Ⅲ号料作为皮料，将其拉成裸光纤和带皮层的光纤两种。然后将拉成的光纤置于亥姆霍兹线圈产生的磁场中，当线偏振光通过该光纤时，其偏振面将旋转一定角度。而偏振面旋转的角度可转换成光信号的强度再进行检测，这种磁光玻璃光纤可用于光纤电流传感器的应用，用于测试电流和磁场。 论文讨论了光纤的双折射和光纤波导中的模式耦合的复杂性，再加上外界环境的影响，导致光纤中模式之间发生耦合，从而导致传输的光损耗增大。采用单模光纤或偏振保持光纤将降低损耗。 论文测试了样品的费尔德常数，研究了磁光玻璃裸光纤的偏振特性。分析了误差的主要来源：耦合效果、光源的稳定性、偏振片对光路的影响、裸光纤自身缺点和模式耦合的影响。根据磁光玻璃光纤的特性，设计了光纤电流传感器的两种探测方式，最后描述了光纤电流传感器在电力系统中的美好应用前景。更多还原

【Abstract】 The polarisation proPerties magneticoptic giass is introduced andutilized in the OPtical-fiber current sensor in the paPeL,’ MagneticoPtic glass plays an driportant role in oPtical fiber sensors. Inthis article we intrOduce itS working Principle and theOries concemed. WthZF1 magnetic-optic glass as core and material III as coat, we drew bareoPtic fiber and with coat, and then put them intO HelmhotZ coil inspective.When introduced with linear-polarzed light, the intensity of the magneticfield can be calculated by measuring the outPut light signal. In this way wecan easily mOnitor large electricity current and magIletic field accuratelyBecause Of the complexity of coupling in modes ProPagating in opticalwave-gUide, the loss of light intensity is out of eliminable. The loss willbe decreased by using single-mode fiber or Poledzation holding fiberIn recent work we measured the Verdet constant of the samples andtested the chederistic of magnetic-optical glass bare fibeL Then, weanalyzc the resource of ermrs, which are coupling effect, stability of thelight source, polarizers, defects of the magnetic-oPtical glass flber andcoupling effects betWeen different modes. In this way we designed tWo1dllds of t1le light detection fOr oPtical-fiber current sensof, and finallyd(7cribe further aPplications in POWr system.更多还原