共查询到20条相似文献,搜索用时 125 毫秒
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菲涅耳微透镜行列阵衍射效率的测试与分析 总被引:1,自引:0,他引:1
归纲了目前二元位相型菲涅耳微透镜列阵衍射效率测试中所用各种衍射效率的不同定义,提出规范定义的建议。并设计了测量衍射效率的系统,方法简单易行,适于测试具有微小单元尺寸的菲涅耳微透镜列阵的衍射效率。 相似文献
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激光直接光刻制作微透镜列阵的方法研究 总被引:2,自引:1,他引:1
介绍了利用激光直接光刻制作8相位台阶菲涅尔衍射微透镜列阵的工艺方法,并对元件的衍射效率及光刻过程中的制作误差进行了分析,透镜列阵在小形Shack-Hartmann波前传感器中得到了应用。 相似文献
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大数值孔径衍射透镜的优化设计方法 总被引:4,自引:0,他引:4
本文针对大数值孔径衍射透镜工艺制作难的问题,以菲涅耳衍射透镜为例,研究了相位匹配原理并提出了一种优化设计二元大数值孔径衍射透镜的方法。在菲涅耳衍射透镜原理的基础上,确定了优化设计多相位台阶衍射透镜的结构参数,并给出了一个设计实例,最后对结果元件的衍射效率进行了分析与讨论。 相似文献
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Sambhu N Datta 《Pramana》1993,41(4):345-362
A set of indigenously developed computer programs for ab-initio Hartree-Fock calculations on both closed- and open-shell molecules
have been described. These programs have been written for calculations using GTO basis sets. Integral formulae have been taken
from Taketaet al [8]. Structures and functions of the programs have been discussed. These programs have been extensively tested. Molecular
integrals over GTO basis sets have been chosen for tests and as numerical examples in this paper. Results of calculations
using very accurate minimal bases have been given for methane. Time taken for these computations in a CDC Cyber 180/840 machine
has been indicated. Trends in the calculations have also been illustrated by employing 4-gaussian expansions for the STO’s
and by varying the basis size for LiH and BH+.
An erratum to this article is available at . 相似文献
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The binary encounter approximation has been used for calculations of electron impact single ionization cross-sections for
F, Cl, Br and I and double ionization cross-sections for Br and I. Contributions of ionization from inner shells have also
been included in the calculations. Hartree-Fock momentum distribution has been used for the bound electron as far as possible.
The results have been found to be in satisfactory agreement with experimental observations. 相似文献
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The hybridizations of a graphene layer by a thymine and a uracil nucleobase have been investigated by performing density functional theory (DFT) calculations. The isolated and hybrid structures have been firstly stabilized to reach the minimum energy and the electronic properties have been subsequently evaluated for the optimized structures. The structural and atomic scale parameters indicated that the tip of graphene is important in determining the properties of new hybrids. Moreover, different effects of thymine and uracil nucleobases have been identified in the hybrid structures. Quadrupole coupling constants have been evaluated to characterize the atomic scale properties, in which the most notable effects of hybridizations have been observed for the atoms close to the linking regions whereas negligible effects have been seen for other atoms. 相似文献
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研究了2.2 m高真空箱式镀膜机镀膜时的实际膜厚分布情况。对非球面和平面光学元件,分别采用行星夹具和平面公转夹具并利用修正板调节膜厚均匀性。从实验上实现了大口径薄膜均匀性的调节,并获得较为理想的结果。口径在700 mm范围内,对于凹面均匀性可以控制在0.7%以内,平面均匀性在1%以内;口径在1 200 mm范围内凹面元件均匀性可控制在1%以内,平面1 300 mm口径以内窗口均匀性可控制在1%以内。镀制了口径在400~1 300 mm的多种天文观测上使用的反射镜、增透膜等,获得了理想的光谱曲线与较好的使用效果。 相似文献
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Sanjib Chatterjee 《Optics & Laser Technology》2005,37(1):43-49
A Fizeau interferometer-based set-up for measurement of surface figure of plane optical surfaces has been discussed. Phase-shifting interferometry has been applied using wedge phase shifter. Technique for elimination of system aberrations has been described. Results are shown for a plane surface. 相似文献
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Electromagnetic theoretic analysis of shielded homogeneous and isotropic dielectric spheres has been made. Characteristic
equations for the TE and TM modes have been derived. Dielectric spheres of radii of the order of μm size are found suitable
for the optical frequency region whereas for the microwave region radii of the order of mm size are found suitable. Parameters
suitable for their application in the optical and microwave frequency ranges have been used to compute the frequencies corresponding
to the normal modes for the TE and TM modes. Expressions for the quality factors for realistic resonators, i.e., for a dielectric
sphere with a non-zero conductivity and a metal shield with a finite conductivity have also been derived for the TE and TM
modes. Computations of the quality factors have been made for resonators with parameters suitable for the optical and the
microwave regions. 相似文献
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A 1.25MV high-voltage electron microscope with a B-type omega filter has been successfully installed at Kyushu University. An image detection chamber has been set inside a concrete block below the ground level without changing the frame structure for anti-vibration. Nearly the same design as that for the 200kV microscope has been kept for the present omega filter except for its size. A new pre- and post-filter lens system with rotation-free imaging has been designed. Energy resolution, beam shape and stability of the filter have been measured. Some application data have been obtained to demonstrate the performance of the filter. 相似文献
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The invariance of Dirac's equation under rotation has been used to obtain the wave equation for a particle interacting with an electromagnetic field. The origin of the anomalous magnetic moment of a particle has been attributed to the existence of mass due to spin. These masses for a few representative particles have been calculated. In particular these calculations give a mass of 592.074 eV for a neutrino. An operator for the spin angular velocity has been constructed and the values of spin angular velocities for the particles have also been calculated. 相似文献
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Reinhardt J. Heuer 《Journal of voice》1992,6(4):352-354
This paper presents a general schema for classifying treatment approaches for both functional and organic voice disorders. It's use is illustrated by a review of treatments for Spasmodic Dysphonia. Most behavioral approaches have been found to be unsuccessful except for mild cases. Inhalation speech as a compensatory technique has been reported as somewhat successful for those mild/moderate cases for whom medical/surgical treatment has not been available. The fact that organic treatment levels have been more successful in the treatment of Spasmodic Dysphonia may lend support to an organic etiology 相似文献
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J. M. S. Pena I. Pérez V. Urruchi J. C. Torres J. M. Otón 《Opto-Electronics Review》2008,16(2):189-193
Chiral smectic liquid crystal cells showing V-shaped electrooptical switching have been reported as one of the most promising
technologies for high-end display applications. In this work, time-resolved electrical behaviour of these devices has been
obtained through a set of systematic measurements. The electrical equivalent circuit has been derived, a number of simulations
at different frequencies have been performed using commercial software for analogue circuits. Performance of this electrical
model to account for time domain variations of switching currents in chiral smectic LC displays with V/W-shaped electrooptical
response has been analyzed as well. 相似文献