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分光计的调整对椭圆偏振仪测量薄膜厚度和折射率的影响 总被引：3，自引：0，他引：3
该文用了两个不同的薄膜样品，在两台不同的分光计上，用不同的入射角对薄膜的厚度和折射率进行了测量，并通过比较实验结果，说明了在用椭圆偏振仪测量薄膜厚度和折射率的实验中，分光计的调整对实验结果的影响是可以忽略的。 相似文献
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迈克尔逊干涉仪测量薄膜的折射率与厚度 总被引：2，自引：0，他引：2
用迈克尔逊干涉仪测量薄膜折射率与厚度的方法,原理简单．通过测出动镜的移动量及观察相应的干涉条纹变化现象,就能计算薄膜的厚度,有较高的测量精度．并基于此装置进行实际测量,理论和实际相符的较好． 相似文献
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为了实时监测光学薄膜的厚度,设计和制作了一款照明和采集干涉图谱为一体的石英光纤束探头,基于光学多道分析器、白色LED光源和计算机等设备组成,实现高精度监测薄膜厚度的测量系统.以薄膜等厚干涉原理为依据,分析了干涉相消波长测量薄膜厚度的原理与可行性.用汞灯标准谱线对光学多道分析器进行定标,通过自制的石英光纤束探头照明和采集干涉图谱,经光学多道分析器与计算机处理获得薄膜反射干涉相消光波长,计算得到光学薄膜厚度.测量系统通过对手机屏幕贴膜和不干胶薄膜样品的涂层厚度测试,可以监测纳米量级的薄膜厚度. 相似文献
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双光束双波长激光干涉（ＤＤＩ）法采用自行设计的可测双波长氦氖激光器作光源，可在同一光路中通过二次测量获得薄膜样品两个波长（０．６３３μｍ，３．３９μｍ）下的光学常数，即折射率、消光系数和厚度，文中论述了调量原理、测量装置和测量结果． 相似文献
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利用迈克尔逊干涉原理测量薄膜厚度的方法,以测量PE保鲜膜和透明塑料膜为例,采用白光干涉产生的彩色条纹来精确测量薄膜的厚度,通过采集干涉产生的实验数据,计算出薄膜的厚度,这是一种实用有效的方法.此方法的测量范围为1μm～1cm,测量精度为0.1μmn. 相似文献
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张明霞 《通化师范学院学报》2009,30(4)
在牛顿环的干涉实验中,产生同心环状的干涉图样的液体薄膜局域等效于液体劈尖.结合液体劈尖的等厚干涉理论与牛顿环的等厚干涉理论,通过理论推导可得到液体折射率和空气薄膜及液体薄膜产生的干涉圃环直径问的关系式;利用此关系式可知,在未知光波波长λ及牛顿环平凸透镜曲率半径R的情况下,只要分别测出同一实验装置下空气膜和液体膜产生的相邻干涉圆环直径,即可方便、准确地测出液体的折射率.这种测量液体折射率的方法不仅大大简化了实验参数,而且表明了液体劈尖的等犀干涉与牛顿环中液体薄膜的等厚干涉本质上的一致性,同时又是对等厚的薄膜干涉理论及实验教学内容的拓展和完善. 相似文献
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根据Abeles法测量了喔星锌的折射率为 1.6 97;利用下涉极值法代替石英晶体振荡法进行监控 ,通过真空蒸发镀制了光学厚度 (nd)为 540nm的喔星锌有机电致发光薄膜 ,说明在真空蒸发下干涉极值法监控有机电致发光薄膜的膜厚是有效的 . 相似文献
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椭圆偏光法测量薄膜折射率和厚度的研究 总被引：1，自引：0，他引：1
傅晓东 《广东教育学院学报》1997,(2)
本文介绍用椭圆偏光法测量薄膜折射率和薄膜厚度的方法，包括测量单层薄膜和多层薄膜的情况 相似文献
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对两种测量液体折射率方法（掠射法和用牛顿环测干涉条纹半径）的理论与实验结果的比较，辨别测量液体折射率方法的优劣。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献