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水的折射率与波长间函数关系的模型 总被引:5,自引:0,他引:5
分析的水的折射率模型,并建立了相应的函数关系式,由对可见区提出的理论推导出了一个简单的三项非线性模型,在覆盖紫外到近红外(200-1100nm)的整个扩展波段上与实测数据吻合良好。 相似文献
3.
Xie Wen Xiong Caidong Wang Xiangru Wang Zhigang Liu Yuming 《International Journal of Infrared and Millimeter Waves》2008,29(4):406-415
In this paper, a new type of gain guiding fiber is presented, with a parabolic-profile for both the gain and index guiding.
Theoretical investigation shows that the core diameter of such fiber may be up to 200 μm while propagating with single-mode. 相似文献
4.
Leonid A. Dombrovsky Jaona H. Randrianalisoa Wojciech Lipiński 《Journal of Quantitative Spectroscopy & Radiative Transfer》2011,112(12):1987-1994
A two-step approximate analytical solution for the normal emittance of a plane layer of an absorbing, scattering and refracting medium is derived analytically. The analysis is based on the transport approximation and the two-step solution method for radiative transfer. The high accuracy of the approximate solution, examined by comparing its results to those obtained independently by the discrete ordinates and Monte Carlo methods, makes it suitable for application in combined experimental-analytical studies to identify selected spectral radiative properties of dispersed media in the range of semi-transparency. 相似文献
5.
Beric Skews 《Experiments in fluids》2005,39(5):875-884
Previous detailed studies of the interaction of a shock wave with a perforated sheet considered the impact of a shock wave
on a plate with regularly spaced slits giving area blockages of 60 and 67%, at various angles of incidence, and resulting
in both regular and Mach reflection. The current work extends this study to a much wider variety of plate geometries. Blockage
ratios of 20, 25, 33, 50, and 67 and inclinations of 45, 60, 75, and 90° to the shock wave were tested. Four different thicknesses
of plate were tested at the same frontal blockage in order to assess the effects of gap guidance. Tests were conducted at
two shock Mach numbers of 1.36 and 1.51 (inverse pressure ratios of 0.4 and 0.5). It is found that secondary reflected and
transmitted waves appear due to the complex interactions within the grid gaps, and that the vortex pattern which is generated
under the plate is also complex due to these interactions. The angle of the reflected shock, measured relative to the plate,
decreases with plate blockage and the angle of inflow to the plate reduces with increasing blockage. By analysing the flow
on the underside of the plate the pseudo-steady flow assumption is found to be a reasonable approximation. Both the pressure
difference and the stagnation pressure loss across the plate are evaluated. It is found that over the range tested the plate
thickness has a minimal effect. 相似文献
6.
L. F. Henderson 《Shock Waves》1992,2(2):103-112
The law is formulated in vector form and is shown to be a powerful principle for studying the refraction of shock waves. A variety of criteria for the onset of irregular refraction are discussed. The refraction index matrix is defined and it is shown that it arises naturally from the law. A projection matrix is also defined and it is found to be useful for operating on the vector wave impedance. It is expected that the methods described here will be useful for the numerical solution of problems in the refraction of shocks by materials with continuous changes in properties. The refraction law is violated in fast-slow refraction by the reflected wave over-running the incident shock to produce an irregular refraction which is either the anomalous type or the Mach-reflection-refraction type. For slow-fast refraction the law is violated by the transmitted wave becoming a precursor and also over-running the incident shock. The precursor may either be a shock or an evanescent compression wave band.This article was processed using Springer-Verlag TEX Shock Waves macro package 1.0 and the AMS fonts, developed by the American Mathematical Society. 相似文献
7.
This paper deals with the application of Huygens’ wave theory of light for the derivation of the generalized vectorial laws of reflection and refraction discovered by the author in 2005. The long-running literature falls short of such a theoretical proof of the generalized vectorial laws of reflection and refraction on the basis of wave theory. As such the present work is novel and original. At the same time it also enhances the theoretical foundation of the discovery of the generalized vectorial laws of reflection and refraction there by proving the efficiency and increasing the range of applicability of the wave theory of light as well. 相似文献
8.
根据单轴晶体的双折射和双反射性质,通过数值计算研究了光轴在入射面内并与晶体界面成任意角时光波p分量在单轴晶体表面反射和折射的相位特性.结果表明,光轴取向对相位变化有较大影响,光从光疏各向同性介质射入单轴晶体时,光轴方向改变反射光p分量的相位突变点,但对折射光p分量相位无影响.光从光密各向同性介质射入单轴晶体未发生全反射时,光轴方向同时影响p分量反射光和折射光的相位突变|发生全反射后,光轴方向影响反射光p分量的相位变化曲线.从单轴晶体出射到光疏各向同性介质未发生全反射时,光轴方向改变反射光p分量的相位跃变规律,折射光p分量在光轴方向和晶面成小角度时在布儒斯特角附近发生相位突变|发生全反射后,反射光p分量的相位变化曲线随光轴方向的改变发生较大变化. 相似文献
9.
超二代微光像增强器多碱光电阴极膜厚测量研究 总被引:1,自引:1,他引:0
介绍了多碱光电阴极的光学性能和光谱反射率特性,测量了多碱阴极的光谱反射率曲线.该曲线与普通光学膜层光谱反射率曲线相比,形状较不规则,原因是多碱阴极膜层存在光吸收.光谱反射率曲线上的干涉峰是入射光在玻璃与阴极膜层界面反射和在阴极膜层与真空的界面反射的两束光发生干涉的结果.根据干涉的原理,如果阴极膜层所反射的两束光的光程差为二分之一波长的偶倍数时,光谱反射将出现干涉加强峰;如果阴极膜层所反射的两束光的光程差为二分之一波长的奇倍数时,光谱反射将出现干涉减弱峰.根据超二代像增强器光谱反射干涉峰对应的波长,可以计算出其阴极膜层的厚度约为191 nm,比二代像增强器阴极膜层的厚度增加了38%.多碱阴极膜层厚度是影响多碱阴极灵敏度的一个关键参量,仅仅靠人眼观察阴极膜层颜色的方法不准确.实践证明,利用光谱反射的方法来计算阴极膜层厚度的方法简单有效.如果在多碱阴极的制作过程中进行光谱反射率的监控,那么将可以精确控制阴极膜层的厚度,对多碱阴极的研究将会更加深入,多碱阴极的灵敏度也将会得到进一步的提升. 相似文献
10.
设计了一种左手材料复合双棱镜,由两块各向同性左手材料棱镜与夹在其间的、其界面与光轴成一定的角度的单轴各向异性左手材料平板构成.研究了发生在其内部界面上的古斯-汉森位移.分析了发生折射的条件和古斯-汉森位移的符号.研究发现,反射波与透射波有相同的古斯-汉森位移,透射波的古斯-汉森位移随着薄层厚度的增加而振荡,整体上呈增加趋势;在透射共振点,透射波的古斯-汉森位移达到极大值,且极大值可达入射波波长的数十倍;发现入射角和光轴与界面的角度对透射波的古斯-汉森位移有很大影响.最后简单地探讨了这种双棱镜的潜在应用. 相似文献