光栅

After analyzing and processing the grating reticle image collected by CCD, the mapping coefficient can be accurately calculated from grid size to pixels. Comparing the fore-and-aft two grating reticle images after the worktable moved. Adopting phase difference ratio arithmetic based on Lissajous figures,the phase difference of two images will be figured out. The displacement of the worktable can be further calculated by the mapping coefficient.

调整光路使CCD获取清晰的光栅图像，对图像进行分析处理，计算出栅距与像素之间的映射关系，再对工作台移动前后的光栅图像进行对比，采用基于李萨如图的相位差比率算法获取它们的像素位置差，从而计算出工作台的实际运行位移。

The body having a grating element (2) comprising a surface of revolution about the axis of rotation.

机体具有光栅元件(2)，光栅元件(2)包括围绕旋转轴的旋转表面。

In most cases, to design a dielectric subwavelength grating polarizing beam splitter requires multilayer structure to improve diffraction efficiency.

在以介电质次波长光栅来设计并制作极化分光器的文献中，大多需要以多层次波长介电质光栅的结构来提升分光的效率。

Because the change of grating period caused by the asymmetrical rotation of two beams is limited to 5×10-4 nm at a tunability of the Bragg wavelength of ~100 nm, the tilt of grating caused by the rotation of the biprism can be ignorable.

因为在~100 nm范围内两光束的非对称旋转对光栅周期的改变是5×10-4 nm，双棱镜引入的光栅的闪耀可忽略。

The first code produces a checker board pattern to check for accuracy and stability of the displayed raster.

第一个代码产生测试光栅，用来检测显示的准确性和稳定性，测试光栅是固定的。

The anisotropic Bragg diffraction properties of volume gratings in photorefractive crystals were investigated by the method of the couple wave theory.

利用耦合波理论分析了光折变晶体中体光栅的各向异性衍射性能，研究了在不同初始记录光强比的条件下，记录光入射角的改变对光折变体光栅各向异性布喇格衍射性能的影响。

The effect both of the initial ratio of the intensity and of the recording angles of writing waves on the anisotropic Bragg diffraction properties of volume gratings was discussed.

结果表明：记录光入射角和记录光初始光强比均对体光栅的各向异性衍射具有选择性；与此相比，记录光入射角和记录光初始光强比对于体光栅各向同性衍射不具备选择性。

The impact of the thickness of volume H-PDLC grating on the wavelength selectivity of Bragg diffraction are simulated numerically, as well as the theoretic relationships among the refractive index modulation, spatial frequency and the H-PDLC diffraction efficiency.

计算机模拟了体光栅厚度对于布拉格衍射波长选择性的影响，以及折射率调制深度、空间频率和H-PDLC光栅衍射效率的关系。

The research on large chirped fiber Bragg grating is an important part of researches about the fiber grating devices.

大啁啾光纤光栅的研究是光纤光栅器件研究中的一个重要组成部分。

Furthermore the Bragg selectivity of the grating is studied, and excellent angle selectivity is proved.

此外，分析了光栅的布拉格选择特性，该光栅具有非常好的角度选择特性。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了