共查询到20条相似文献，搜索用时 93 毫秒
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陆国会 《吉林广播电视大学学报》2007,(6):113-113
液芯光纤可以大幅度提高拉曼光谱强度,共振拉曼光谱强度可以提高10~6倍。怎样能使液芯光纤重复使用,清洗液芯光纤是至关重要的环节。本文介绍了一种简单、实用的液芯光纤清洗系统。 相似文献
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采用波分和空分混合复用技术和LabVIEW,设计了一种可通过单片机控制的光纤Bragg光栅(FBG)传感监测解调系统,实现了温度和应变的实时监测。实验研究表明,在20～100℃范围内,温度监测平均误差0.3℃,标准差0.163℃,实验灵敏度与标定灵敏度之间的灵敏度误差为0.29%;在0～390με应变范围内,应变监测平均误差2.79με,标准差2.63με,悬臂梁上下FBG实验灵敏度与标定灵敏度之间的灵敏度误差分别为0.10%、0.19%。该解调系统实现了高灵活性、高精度的温度和应变监测。 相似文献
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通过研究荧光型光纤温度传感和热辐射型光纤温度传感，该文设计了一种结合荧光寿命与热辐射测温的光纤温度传感器，适用温度为30～800℃。首先，改进了传统的荧光传感探针，采用石英玻璃棒代替光纤，可避免高温下光纤吸收和散射损耗导致的光传输效率下降。其次，利用耐高温的Y(P,V)O4:Eu3+荧光材料进行中、低温段(低于400℃)的荧光寿命测温，获得材料荧光寿命与温度的关系；在中、高温段(高于300℃)，使用光功率计测得1 490 nm波长下光纤探针的热辐射功率与温度的关系，并拟合得到热辐射功率与温度的四阶表达式；然后，在两种测温方法都有效的温度重叠区(300～360℃)，使用荧光寿命测温值标定热辐射的功率与温度关系式，确保高温段的测温精度；最后，将荧光寿命测温与热辐射测温相结合，实现30～800℃范围内的温度测量。 相似文献
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我们把拉曼光谱仪与实验室自制的光纤探针结合起来,建立了微区拉曼光谱系统,并基于此装置进行了实际测量,效果较好. 相似文献
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阐述了光纤拉曼放大器的原理、分类,并对其研究现状、发展趋势和研究展望进行了探讨和总结。其中,采用有限元法,着重数值仿真了光纤拉曼放大器放大信号的原理过程。结果表明,基于Chraplyvy模型能够较好地模拟出受激拉曼散射作为光纤拉曼放大器原理的过程,并且其程序运行效率高于采用洛仑兹模型。通过研究综述,为光纤拉曼放大器的理论研究、实验和工程应用测试工作提供了参考。 相似文献
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基于光纤传能设计并开发了光纤式激光诱导击穿光谱实验平台，该平台包含纳秒脉冲激光源、光纤光谱仪、数字延时发生装置等硬件设备，同时包含具备光谱数据显示储存、定量分析、结果报告等功能的配套软件。实验平台解决了激光-光纤耦合、激光馈出后的二次聚焦、光谱信号收集回传等关键技术。研究结果表明：所开发的光纤式激光诱导击穿光谱实验平台运行稳定；实现了材料元素组成远距离的自动化识别与定量检测。在激光诱导击穿光谱仪器设计、开发方面具备较好的参考价值。 相似文献
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超长距离系统中光纤拉曼放大器的设计 总被引：2，自引：0，他引：2
简述了各种结构光纤拉曼放大器的性能,充分考虑了实际情况,从同向抽运与反向抽运光纤拉曼放大器的耦合微分方程出发,对两者信号光的功率演变过程进行了推导,并引进设计实例,说明了综合利用同向抽运与反向抽运各自放大信号的特点可以设计长距离和超长距离系统中的双向抽运光纤拉曼放大器,为光纤拉曼放大器的进一步研究提供了参考。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 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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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 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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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 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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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献