基于磁光效应的微位移测量
发布时间：2019-04-27 15:07
【摘要】：磁光效应是光与具有磁矩物质相互作用的产物。迄今,已经被发现的磁光效应有如下几种：法拉第效应,塞曼效应,克尔效应,科顿穆顿效应,磁二向色性,磁激发光散射,等等。磁光效应在科研及工业生产中具有广泛的应用前景,从而受到物理及材料研究的持续重视。本文所研究的是一种复合磁光材料,是用具有铁磁性的铽镝铁(TDF)和弹光材料聚碳酸酯(PC)经层状复合所组成。铽镝铁具有优异的磁致伸缩效应,而聚碳酸酯表现出室温条件下的应力双折射效应。当两者经弹性耦合后,可产生磁致伸缩诱导的应力双折射,我们可称这种现象为磁致应力双折射效应。论文首先表征了聚碳酸酯应力双折射效应。TDF受到磁场作用的时候,在PC中产生一个应力分布,这可以从圣维南原理得到解释。分析了TDF在磁场作用下在层状复合材料的界面引起的应力,以及由此引起的弹光相中的应力及应变的分布,并推导出输出光强随光点位移的变化的理论模型。基于上述理论预测我们制做了一套微位移测量装置,以此来测量光点的微位移。此系统主要通过观察照度计上光强的大小随着位移的变化规律。通过实验发现弹光相(PC)上透射光强随着入射光点距复合材料界面的距离的增大而减小,并随离开样品中心线距离的增加而减小。另外,从理论和实验的角度分析了透过PC的光强的大小随着材料厚度衰减,发现两者约成线性关系,其精度可达微米量级。该技术所用装置简捷,原理直观,样品制备方法简便且价廉。这一技术在二维微位移测量领域具有应用前景。
[Abstract]:Magneto-optic effect is a product of interaction between light and material with magnetic moment. Up to now, the magneto-optic effects have been found as follows: Faraday effect, Zeeman effect, Kerr effect, Cottonton effect, magnetic dichroism, magnetically excited light scattering, and so on. Magneto-optic effect has a wide application prospect in scientific research and industrial production, so it has been paid more and more attention in physics and material research. In this paper, a composite magneto-optic material is studied, which is composed of ferromagnetic terbium dysprosium iron (TDF) and elasto-optic material polycarbonate (PC). Terbium-dysprosium iron has excellent magnetostrictive effect, while polycarbonate exhibits stress birefringence at room temperature. The magnetostrictive induced stress birefringence can be induced by elastic coupling, which can be called magnetostrictive birefringence. In this paper, we first characterize the stress birefringence effect of polycarbonate. When TDF is subjected to a magnetic field, it produces a stress distribution in PC, which can be explained by the Saint-Winan principle. The stress induced by TDF at the interface of layered composites under the action of magnetic field and the distribution of stress and strain in the elasto-optical phase are analyzed. The theoretical model of the variation of the output light intensity with the displacement of light points is derived. Based on the above-mentioned theory, we have made a set of micro-displacement measuring device to measure the micro-displacement of light point. This system is mainly by observing the variation of light intensity with displacement on the illuminance meter. It is found that the transmitted light intensity on the elasto-optic phase (PC) decreases with the increase of the distance between the incident light point and the interface of the composite, and decreases with the increase of the distance from the center line of the sample. In addition, the attenuation of the light intensity through the PC with the thickness of the material is analyzed theoretically and experimentally. It is found that there is a linear relationship between the two, and their accuracy can reach the order of micron. The device used in this technology is simple, the principle is direct, the sample preparation method is simple and cheap. This technique is promising in the field of two-dimensional micro-displacement measurement.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33;TB302
本文编号：2467077
[Abstract]:Magneto-optic effect is a product of interaction between light and material with magnetic moment. Up to now, the magneto-optic effects have been found as follows: Faraday effect, Zeeman effect, Kerr effect, Cottonton effect, magnetic dichroism, magnetically excited light scattering, and so on. Magneto-optic effect has a wide application prospect in scientific research and industrial production, so it has been paid more and more attention in physics and material research. In this paper, a composite magneto-optic material is studied, which is composed of ferromagnetic terbium dysprosium iron (TDF) and elasto-optic material polycarbonate (PC). Terbium-dysprosium iron has excellent magnetostrictive effect, while polycarbonate exhibits stress birefringence at room temperature. The magnetostrictive induced stress birefringence can be induced by elastic coupling, which can be called magnetostrictive birefringence. In this paper, we first characterize the stress birefringence effect of polycarbonate. When TDF is subjected to a magnetic field, it produces a stress distribution in PC, which can be explained by the Saint-Winan principle. The stress induced by TDF at the interface of layered composites under the action of magnetic field and the distribution of stress and strain in the elasto-optical phase are analyzed. The theoretical model of the variation of the output light intensity with the displacement of light points is derived. Based on the above-mentioned theory, we have made a set of micro-displacement measuring device to measure the micro-displacement of light point. This system is mainly by observing the variation of light intensity with displacement on the illuminance meter. It is found that the transmitted light intensity on the elasto-optic phase (PC) decreases with the increase of the distance between the incident light point and the interface of the composite, and decreases with the increase of the distance from the center line of the sample. In addition, the attenuation of the light intensity through the PC with the thickness of the material is analyzed theoretically and experimentally. It is found that there is a linear relationship between the two, and their accuracy can reach the order of micron. The device used in this technology is simple, the principle is direct, the sample preparation method is simple and cheap. This technique is promising in the field of two-dimensional micro-displacement measurement.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33;TB302
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