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diffraction disc
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  相似匹配句对
     disc ventilation;
     制动盘通风散热性能研究;
短句来源
     On Natures of Diffraction
     关于衍射的本性
短句来源
     The X-Ray diffraction and
     利用全港X射线衍射分析提取微结构参数如球镍的层错缺陷结构参数和储氢合金的微结构信息以及利用织构分析探讨电极材料的织构生长特性。
     THE FRAUNHOFER DIFFRACTION AT A CIRCULAR DISC ILLUMINATED BY A GAUSSIAN BEAM
     高斯光束照射下的圆盘夫琅禾费衍射
短句来源
     By analysing the disc of 38 in.
     通过对38in.
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  diffraction disc
Next, measurements were made to determine the effect of a diffraction disc on the disc-cone antenna pattern.
      
It was found that the absorber only had a small effect on the diffraction disc.
      
It was found that the diffraction disc had an appreciable effect on the resultant pattern of the disc-cone antenna.
      


The symmetry of CBBD patterns provides a powerful means for determ'ning the crystal point groups and space groups. To obtain a useful CBED pattern, the angle of convergence of the electron beam must be large enough, but the diffraction discs must not overlap. A new method for obtaining non-overlapping large-angle CBED is proposed here. The principle of this method is equivalent to that proposed by Tanaka et al. Instead of shifting the specimen, the electron beam is defocused, thus retaining the eccentric...

The symmetry of CBBD patterns provides a powerful means for determ'ning the crystal point groups and space groups. To obtain a useful CBED pattern, the angle of convergence of the electron beam must be large enough, but the diffraction discs must not overlap. A new method for obtaining non-overlapping large-angle CBED is proposed here. The principle of this method is equivalent to that proposed by Tanaka et al. Instead of shifting the specimen, the electron beam is defocused, thus retaining the eccentric height of the specimen. Hence the area of interest will not be lost when the specimen is tilted. Large-angle CBED patterns generated by a large electron probe (>2μm) may besdistorted, but they are useful.

会聚束电子衍射是测定晶体点群、空间群的有效方法。要清楚地判断会聚束电子衍射图样的对称性,电子束的会聚角要大,但衍射盘不能重叠。本文提出了一种新方法来获得不重叠的大角度会聚束电子衍射。新方法是使电子束离焦,固定样品,从而保留了样品的同心倾动位置,作大角度倾动时不会失去原来感兴趣的区域。新方法在原理上和田中等人提出的方法相同,但优越性更大。同时也研究了大束斑(≥2μm)大角度会聚束电子衍射。

The designing formula of multilevel diffractive microlenses is presented. Body-of-revolutionary finite-difference time-domain method (BOR FDTD) is illustrated. The multilevel diffractive microlenses are analyzed by use of BOR FDTD. The effects of changing design parameters (including focal length, incident wavelength, refractive index of microlens material) on multilevel diffractive microlens are investigated. The results show that changing design parameters have effects on diffractive efficiency, airy diffraction...

The designing formula of multilevel diffractive microlenses is presented. Body-of-revolutionary finite-difference time-domain method (BOR FDTD) is illustrated. The multilevel diffractive microlenses are analyzed by use of BOR FDTD. The effects of changing design parameters (including focal length, incident wavelength, refractive index of microlens material) on multilevel diffractive microlens are investigated. The results show that changing design parameters have effects on diffractive efficiency, airy diffraction disc radius and maximum electric magnitude of microlens. The qualitative analyses of microlenses are consistence with some of numerical results.

给出了多台阶衍射微透镜的设计公式,并阐述了旋转体时域有限差分法。通过采用该方法对设计的多台阶衍射微透镜进行分析,说明了设计参数(包括焦距、入射波长、透镜材料折射率)的变化与微透镜衍射效率、爱里斑半径、最大场强变化的关系,对部分结果的定性讨论与数值分析结果一致。

 
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