共查询到20条相似文献,搜索用时 140 毫秒
1.
NO2分子的塞曼调制激光光谱 总被引:1,自引:1,他引:0
在16840cm^-1-16860cm^-1内测量了NO2分子的塞曼调制光谱(ZMS),得到了相对简化的NO2分子光谱的转动结构,解释了塞曼调制光谱的形成原因和它的主要特征。表明ZMS光谱技术有助于对NO2复杂的转动结构进行标识。 相似文献
2.
塞曼调制磁旋转分子光谱特征的研究 总被引:1,自引:0,他引:1
夏长平 《原子与分子物理学报》1997,14(4):547-552
以N2第一正带(B3Πg-A3Σ+u)为对象,研究塞曼调制磁旋转光谱技术的主要特征,对谱线的线型和位相做了详细的分析,同时,还提出并解释了谱线强度分布中的塞曼选态效应,结果均与实验相符合。 相似文献
3.
熔铸锆刚玉耐火材料的X射线荧光光谱分析 总被引:5,自引:0,他引:5
本文提出了一个用X射线荧光光谱法分析熔铸AZS耐火材料中十个主,次量组分的全分析方法。样品用熔融法制备,用理论影响系数法校正元素的吸收-增强效应。 相似文献
4.
5.
6.
7.
8.
9.
美国科学院的国家材料顾问委员会受NASA和五角大楼高级研究项目部(AdvancedResearchProjectsAgency)的委托,提出了《扩展传感器材料的视野》(ExpandingtheVisionofSensorMaterials1))报告.报告认为:激光和光纤传感在发展工业和研究用新传感器方面的前景光明,例如,它可用来监测树脂热固过程和半导体加工过程,它在能感知和补偿形状变化的“智能”结构中和新的化学传感器中也可以起重要作用。报告呼吁:政府不宜重点支持发展用于传感器的新材料,而是应该集… 相似文献
10.
CO分子d3Δ-a3Π三重带的塞曼调制磁旋转光谱的研究 总被引:2,自引:0,他引:2
采用塞曼调制磁旋转光谱技术(ZeemanModulationmagneticRotationSpectroscopy以下简称ZM-MRS)研究CO分子(d3Δ-a3Π)的(5-0)振动带高灵敏度吸收谱。标识出了十二个子带,观察到了下态a3Π的Λ双分裂,拟合出了上下态分子常数。 相似文献
11.
A simple method to determine the fringe orders at points between fringes in holographic interferometry is presented. The method is based on the use of two reference beams in the recording and reconstruction of the interferogram. A phase difference is imposed between the reference beams on reconstruction through polarization elements. The interferogram is viewed through a polarizer to recombine the images. The fractional fringe order is obtained from the angle through which the polarizer is rotated to shift the adjacent fringe to the point of interest. 相似文献
12.
13.
提出了一种利用圆偏光仪测量扭曲向列相液晶盒盒厚的新方法,即:圆偏光仪组成为两端是一对起偏器和检偏器,中间放置一对四分之一波片.起偏器和检偏器平行或垂直放置,其中一个四分之一波片的快轴和起偏器透光轴成45°,另一个四分之一波片的快轴和起偏器透光轴成-45°.液晶盒样品直接插入到两四分之一波片中间,无需调整方向.不同于旋转液晶盒或偏振片寻找输出光强最大值或最小值的方法,圆偏光仪测量盒厚不需要旋转任何光学元件或液晶盒观测输出光强的变化,只需要观测检偏器在平行和垂直方向的两个强度值,能够实现快速测量,简洁而且有效. 相似文献
14.
15.
Tinko Eftimov 《Fiber and Integrated Optics》2004,23(6):453-466
A detailed Mueller-Stokes analysis of an arbitrary elliptical dichroic polarizer is presented. Explicit expressions for the Jones matrix, the Stokes parameters, and the Mueller matrix for a distributed and localized dichroic polarizer acting as a polarization-dependent loss (PDL) element are derived. Application to wavelength-dependent PDL elements is discussed. The Poincare sphere representation and the application of the Mueller matrices for the study of randomly oriented concatenated PDL elements and PDL vector measurement are addressed. 相似文献
16.
激光遥感偏振成像系统光学元件调整及误差分析 总被引:6,自引:3,他引:3
改进了利用双旋转波片方法进行偏振成像的实验装置,提出了通过一次测量获得目标偏振度和强度编码图像的方法.运用光强法对激光遥感偏振成像装置的光学元件进行调整,通过斯托克斯和穆勒矩阵在偏振光学元件中的应用,给出了相应光学元件的调整原理、方法及过程.分析了激光器中心波长变动、偏振片的角度误差和波片的相位延迟及角度误差对整个系统的影响.结果表明,由偏振片角度和波片角度误差造成的出射光斯托克斯误差较小,不超过0.001,可以忽略;由波片相位延迟不精确造成的误差在0.02左右,所以应采用延迟精度较高的波片;激光器中心波长变化的影响最大,不能忽略,必须加滤光片使接收光的中心波长控制在808nm;镀有铝膜望远镜对接收到的散射光偏振度影响较小,适于激光遥感偏振成像系统的应用. 相似文献
17.
The high dependence of polarization resolved laser-induced breakdown spectroscopy on experimental conditions
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
It is shown that the continuum emission produced by an Al alloy ablated by femtosecond laser pulses is much more polarized than the characteristic lines of elements. A Glan-Thomson polarizer is used in the laser-induced breakdown spectroscopy experiment to investigate the polarization effect. The use of the polarizer at its minimal transmission increases the signal-to-noise ratio. The effects of angle of detection, focal position, and pulse energy on the signal-to-noise ratio are also studied. 相似文献
18.
We propose a new type of polarizer that utilizes indefinite media–media for which not all elements of the permittivity and
permeability tensors possess the same sign [5]. We demonstrate both theoretically and numerically that, when certain physical
parameters are chosen, a slab of indefinite media can transmit all the p-polarized components of the incident electromagnetic
waves and fully reflect the s-polarized ones; thus, it can be used as a linear polarizer or a polarizing beam splitter. The
proposed polarizer has some advantages compared to polarizers of the conventional types. Practical models for such polarizers
are also presented.
PACS 42.79.Ci; 42.25.Gy; 78.67.-n 相似文献
19.
D. Mao Z. Ouyang J.C. Wang C.P. Liu C.J. Wu 《Applied physics. B, Lasers and optics》2008,90(1):127-131
Through the transfer matrix method, we demonstrated a special polarizer integrated with the functions of narrow bandpass (NBP)
and narrow transmission-angle (NTA) filtering at normal incidence in a stack of two one-dimensional defective photonic crystals
(PCs). One of the PCs is made of an isotropic dielectric media, while the other PC is made of anisotropic media. The key point
in designing the stack is to set the central frequencies of the defect modes of the two sub-PCs to be the same for one polarization
at normal incidence, but different for oblique incidence or for other polarizations, so that the stack structure could have
the functions of three elements: a polarizer, an NBP filter, and an NTA filter.
PACS 42.79.Ci; 42.70.Qs; 41.20.Jb 相似文献
20.
基于旋转光纤耦合模理论,对窄带和宽带旋转光纤圆起偏器的特性进行了计算分析.研究了注入光的偏振态、光纤固有线双折射和旋转速率对窄带圆起偏器最小工作长度的影响,并借助多包层光纤的分析方法,分析了旋转光纤各参量变化对宽带圆起偏器工作带宽的影响.结果表明:窄带圆起偏器的最小工作长度与光纤固有线双折射和光纤旋转速率有关,而与注入光的偏振态无关|改变光纤旋转速率可调节宽带圆起偏器的工作带宽,改变应力区到纤芯的距离可改变宽带圆起偏器的中心波长. 相似文献