共查询到18条相似文献,搜索用时 218 毫秒
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光是一种电磁现象,并具有波粒二象性。磁性是物质的最基本最普通的属性,磁场是物质的一种特殊存在形态。因此探索光、物质和磁场三者之间相互作用的内在联系,是现代物理学中的一个重要分支之一——磁光学。研究材料的磁光性质是认识基本磁性的有力手段,磁光学就是研究在磁场作用下所引起的各种光学现象。本文介绍了磁光效应当中的一种效应,即法拉第磁光效应以及它的测量方法和应用举例,分二期连载。 相似文献
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基于电光晶体的泡克尔斯效应和磁光玻璃的法拉第效应,提出一种新颖的光学电功率传感系统。该系统主要将电光晶体与磁光玻璃患联使用,可以直接获取电功率传感信号。研究了传感系统的传感原理,并分别对纯电阻性和感性负载进行交流电功率传感实验,其非线性误羝分别低于1.3%和1.4%。 相似文献
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新型磁光隔离器的研制与分析 总被引:1,自引:0,他引:1
论述了新型在线式与偏振无关薄膜光隔离器的设计、性能分析及实验结果,我们选择了TbBi三石榴石磁光薄膜作为45°法拉第旋转器,两个YVO4材料制成的楔形双折射晶体作为分束器及合束器,准直聚焦系统采用的是短焦距小像差的p/4自聚焦棒,整个器件体积小,结构简单,正向损耗小于1dB,反向损耗小于30dB。采用矩阵光学分析了光隔离器正向插入损耗和反向隔离与法拉第旋转器旋光角精度及两个楔形双折射晶体主光轴的相 相似文献
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肖智宏 《电力系统保护与控制》2014,42(12):148-154
高可靠性和测量精确性是电力系统光学互感器实用化的前提和基础。应用电力传感光学理论,从结构模型出发,对磁光玻璃型和全光纤型光学电流互感器、电光晶体型和全光纤型光学电压互感器的实现方案进行了分类和技术比较,指出了各种方案在检测算法和制造工艺的优缺点。最后,对光学传感技术实用化需要关注的问题和研究方向进行了探讨。 相似文献
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Microscopic dopant distribution has been investigated in 1mm-diameter single crystal fibers of Ti-doped Y3Al5O12 (YAG) grown by a laser heated floating zone (LHFZ) method. In the fibers, a periodic fluctuation in the Ti dopant concentration has been observed along the growth direction, and striations, attributed to variation in dopant concentration, were seen across the diameter of the fiber by two dimensional mapping using an electron probe microanalyser. The dopant concentration was found to vary by as much as 30% from average levels with a spacing of the order of 20m. Microscopic inhomogeneities of Ti are discussed in relation to growth conditions with emphasis on crystal/feed rotation. Effects to minimize segregation effects by annealing are reported. 相似文献
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水基Fe3O4磁流体动态法拉第磁光特性的研究 总被引:1,自引:1,他引:0
为研究在交变磁场作用下铁磁流体动态法拉第磁光特性,设计了一套用于研究铁磁流体磁光效应的实验平台,分析研究了交变磁场作用下所含Fe3O4颗粒的质量分数分别为2%、5%、10%、15%、20%、31.2%等质量分数的水基Fe3O4磁流体动态法拉第磁光特性。实验结果表明:铁磁流体对工频交变磁场的响应线性度达到0.9946;与块状玻璃磁光介质相比,铁磁流体所展示的法拉第磁光特性有很大差异;质量分数对铁磁流体法拉第磁光特性的影响明显,其趋势是先随着铁磁流体质量分数的降低,其对磁场的响应程度反而缓慢增强,到质量分数为10%时达到最大值,其后随着质量分数的降低而急剧减弱。分析表明:铁磁流体的这种磁光特性与其在磁场作用下形成平行于磁场方向的线状链有密切关系;质量分数对铁磁流体法拉第磁光特性的影响主要是因其黏度变化导致。 相似文献
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Single crystal fibers of Ti-, Zr- and Cr-doped Y3Al5O12 (YAG) were grown from polycrystalline feed rods in Ar+5%H2, pure Ar and Ar+2%O2 atmospheres using the laser heated floating zone method. The spatial dopant distribution and precipitation of second phases in the grown fibers has been systematically studied by means of electron probe microanalysis. A strong growth-atmosphere dependence of effective segregation coefficient and precipitate formation were seen in Ti- and Cr-doped fibers, but not in Zr-doped fibers. The highest doping of Ti into the YAG lattice was obtained in Ar+5%H2 atmosphere, while Cr was able to be incorporated into YAG by suppression of evaporation under an Ar+2%O2 atmosphere. The results are discussed in terms of atmosphere-dependent valence state and volatility of the dopant. 相似文献
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Hamid Ghayour Majid Abdellahi Maryam Bahmanpour Amirsalar Khandan 《Journal of Computational Electronics》2016,15(4):1275-1283
Due to their colossal dielectric constant (CDC), \(\hbox {RFeO}_{3}\), orthoferrite ceramics (R = rare earth metal) have recently attracted much attention. In the present research, the dielectric constants of \(\hbox {RFeO}_{3}\) orthoferrite ceramics, whether with or without CDC, have been simulated. The type of synthesis method, the type of R material, temperature, and frequency as the effective parameters on the dielectric behavior are introduced to the model. Another input parameter is the ratio of \(\hbox {Fe}^{+2}/\hbox {Fe}^{+3}\) peak area (in the XPS diagram), which is the most important parameter that affects the CDC behavior. Initially, a colossal database is formed by means of WebPlotDigitizer software and 2930 experimental data, and then the simulation is carried out through gene expression programming. Two case studies are also performed on \(\hbox {PrFeO}_{3}\) and \(\hbox {NdFeO}_{3}\) orthoferrite ceramics to validate the accuracy of the presented model. \(\hbox {PrFeO}_{3}\) exhibits significant CDC behavior whereas the \(\hbox {NdFeO}_{3}\) ceramic samples possess little CDC property, both of which were precisely simulated by the model. Two-dimensional tenth-degree equations resulting from the model predict the dielectric constant variations accurately. 相似文献
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基于平均场理论,提出重稀土-轻稀土-过渡族非晶薄膜温度特性的计算方法,详细讨论了薄膜成分对薄膜磁学和磁光性能的影响。研究表明,用适量的轻稀土元素替代重稀土元素,室温下饱和磁化强度增大,克尔角有所提高,薄膜的补偿点温度下降,恧大里点温度基本保持不变,并且饱和磁化强度和矫顽力随温变化趋向缓慢,从而可以拓宽磁光介质的使用温度范围。 相似文献