【摘要】：磁光效應(yīng)是光與具有磁矩物質(zhì)相互作用的產(chǎn)物。迄今,已經(jīng)被發(fā)現(xiàn)的磁光效應(yīng)有如下幾種：法拉第效應(yīng),塞曼效應(yīng),克爾效應(yīng),科頓穆頓效應(yīng),磁二向色性,磁激發(fā)光散射,等等。磁光效應(yīng)在科研及工業(yè)生產(chǎn)中具有廣泛的應(yīng)用前景,從而受到物理及材料研究的持續(xù)重視。本文所研究的是一種復(fù)合磁光材料,是用具有鐵磁性的鋱鏑鐵(TDF)和彈光材料聚碳酸酯(PC)經(jīng)層狀復(fù)合所組成。鋱鏑鐵具有優(yōu)異的磁致伸縮效應(yīng),而聚碳酸酯表現(xiàn)出室溫條件下的應(yīng)力雙折射效應(yīng)。當(dāng)兩者經(jīng)彈性耦合后,可產(chǎn)生磁致伸縮誘導(dǎo)的應(yīng)力雙折射,我們可稱這種現(xiàn)象為磁致應(yīng)力雙折射效應(yīng)。論文首先表征了聚碳酸酯應(yīng)力雙折射效應(yīng)。TDF受到磁場作用的時(shí)候,在PC中產(chǎn)生一個(gè)應(yīng)力分布,這可以從圣維南原理得到解釋。分析了TDF在磁場作用下在層狀復(fù)合材料的界面引起的應(yīng)力,以及由此引起的彈光相中的應(yīng)力及應(yīng)變的分布,并推導(dǎo)出輸出光強(qiáng)隨光點(diǎn)位移的變化的理論模型。基于上述理論預(yù)測我們制做了一套微位移測量裝置,以此來測量光點(diǎn)的微位移。此系統(tǒng)主要通過觀察照度計(jì)上光強(qiáng)的大小隨著位移的變化規(guī)律。通過實(shí)驗(yàn)發(fā)現(xiàn)彈光相(PC)上透射光強(qiáng)隨著入射光點(diǎn)距復(fù)合材料界面的距離的增大而減小,并隨離開樣品中心線距離的增加而減小。另外,從理論和實(shí)驗(yàn)的角度分析了透過PC的光強(qiáng)的大小隨著材料厚度衰減,發(fā)現(xiàn)兩者約成線性關(guān)系,其精度可達(dá)微米量級。該技術(shù)所用裝置簡捷,原理直觀,樣品制備方法簡便且價(jià)廉。這一技術(shù)在二維微位移測量領(lǐng)域具有應(yīng)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.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33;TB302

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本文編號：2467077