两条纹的

In this system, the gratings are inscribed by the UV interference fringes of 248 nm derived from a rotatable biprism, where the phase mask is used as a beam splitter, and the biprism is rotated to change the intersection angle of two beams.

在该系统中，光纤光栅是由来自可旋转双棱镜所形成的波长为248 nm的紫外干涉条纹写入的，其中，相位掩模被用作1级衍射光的分束器，通过双棱镜的旋转可改变两写入光束的交叉角。

The Gaussian properties of laser beams may cause the appearance of gradients in the interference pattern in the measuring volume and a broadening of Doppler spectrum....

本文定量地论述了高斯光束的各因素对测量精度的影响；给出了测量误差表达式，经过各种情况下的理论计算值的对比和分析，得出了两束腰分别在测量区两侧，等距离时，干涉条纹空间频率梯度引起测量误差最小的结论。

New bought a one likes to books, paper-based is kind of the Special is important to keep them lightly pico yellowed's original health certificate is the disguise of dictionary on a leash, and the light-blue hardware binders, is a share greatly windows the bedroom, blue-the floret shrug it off on a wooden the old on the floor,, streak 兰 masked whip up kicks exposed below a pure-white bed-linen, Pan Hu Hu the two big pillows rely on together, on one of the walls arbitrarily hung simple Photo Frame, the visibility of window, to clean the weather, the bluer sky and white-yun, the Green tree, there in sight for the garbageman Rope 松松, scattered and, scattered and Da Zhe the clothing, a pair of Silver SHOES IN, slender shoelace Shuan-in Rope, Feng Er Qingbai......

前一阵子，新买了一个喜欢的本本，纸质是那种特别轻巧微微泛黄的原生纸，包装成字典的样子，淡蓝色的硬封皮上，是一间有着大大窗户的卧室，浅兰的小花洒落在木制的老旧的地板上，条纹兰的被罩掀起一脚露出下面洁白的床单，胖乎乎的两个大枕头靠在一起，一面墙上随意挂着简单的像框，望向窗外，干净的天气，蓝的天，白的云，绿的树，还有近在眼前的纤细绳上松松散散搭着的衣物，一双银色的舞鞋，细长的鞋带拴在绳上，风儿轻摆。。。。。。

By collecting images of fringes of equal chromatic order and comparing them,the influence of many factors on FECO and clearance calculation of surface forces apparatus,such as the distance between the object glass and the contact point,the grating constant of spectrometer,the angel between total reflection triple prism and the flat of inner beam path and so on,was analyzed.

通过采集图象进行对比分析的方法，讨论了表面力仪中物镜与接触点的距离、分光仪光栅常数、全反射三棱镜与单色仪光路光学平面夹角等因素对FECO条纹以及后续计算的影响，并介绍了表面力仪中计算表面间隙的两类主要方法。

We expect it will benefit the industry field to break through the optical measuring limits at present by offering some new ideas. Optical measuring research based on moire interferometry has developed for several decades. The main idea of this research is to utilize the moire effect caused by two superimposed gratings of identical or similar spatial frequency. One is the reference grating and it is a virtual grating created by a computer program in this research; The other grating is the image of grating projected on the measured surface by the DLP projector, and this grating will distort because of the different sloped profile of the surface. To superimpose the program-created grating and the captured distorted grating will derive the so-called moire effect. This research combined the basic theory of optical interferometry and moire effect to project the different phases of the projected grating fringes by the phase-shifting method and compute the principal value of arguments between -π,π. In the end, the phase unwrapping program based on discrete Fourier transform of solving PDEs is used to unwrap the phase of the measured surface, and finally the surface profile is derived by the optical measuring system.

以叠纹干涉术为基础的光学检测研究之发展早已行之有年，而在本研究中所采用的投影叠纹法(Projection moiré)之主要精神在於藉由两道空间频率相近或相同的光栅相互叠加而成的效应，其中一道为参考光栅，而本研究中的参考光栅是以程式产生可调整不同空间频率的虚拟光栅；另一道则为投影至待测物表面的光栅影像，而在起伏高度不一的待测表面上的光栅影像会受到待测物表面起伏状况不同而在观测方向产生光栅投影条纹影像的歪曲变形，将电脑产生的参考光栅与由影像撷取装置所获取投影於待测物表面的光栅影像作叠合，便会产生所谓的叠纹效应；利用基本的光学干涉理论与叠纹效应结合，本研究中以相移法来改变投影於待测表面的光栅相位，再以相移法的理论反运算出在带有待测面各点高度资讯之介於-π，π相位主幅角，再以离散傅立叶转换解偏微分方程的相位重建程式还原待测面的相位值，以得知待测面之表面轮廓。

Experimental study is practiced to examine AWJ cutting quality.By changing waterjet pressure and cutting speed,cutting kerf surface quality is studied.By the analysis of AWJ cutting mechanism and cutting process,the thesis explores the specific shape of the cutting section and its mechanism,and believes that the asymmetric distribution of abrasive jet's kinetic energy and jet's deflexion causing the formation of striations,waviness and cuspidate end.However,high-efficient cutting of AWJ could be achieved by...

对磨料水射流的切割质量进行了试验研究，通过改变水射流压力、切割进给速度来研究切割断面质量，对AWJ切割机理和切割过程进行了分析，探讨了AWJ切割断面的形貌特征及其形成机理，认为是射流断面磨料动能的分布不均和射流的偏转滞后造成了AWJ切割断面斜条纹和曲线及尖角处的尖端，提出了两种提高磨料水射流切割质量的方法。

Any of various coniferous evergreen trees of the genus Tsuga of North America and eastern Asia, having small cones and short, flat leaves with two white bands underneath.

铁杉属树木北美及东亚铁杉属中松柏科常青树的一种，有小的孢子叶球及短而平的叶子，叶下有两条白色的条纹

Hemlock: Any of various coniferous evergreen trees of the genus Tsuga of North America and eastern Asia, having small cones and short, flat leaves with two white bands underneath.

铁杉属树木北美及东亚铁杉属中松柏科常青树的一种，有小的孢子叶球及短而平的叶子，叶下有两条白色的条纹

A normal method to eliminate these stripes is presented. And then a new method based on a stable reference source is presented and validated. And the two methods are compared. The result shows that it is better to turn off blackbody controller when it is very difficult to control blackbody temperature precision, and it is of significance for remote sensing application of infrared scanner.

针对该明暗条纹消除方法，介绍了常规的基于图像处理的&Laplacian噪声消除法&，并提出了一种新的解决方法&恒定参考源法&，通过对比这两种方法，认为在难以保证黑体控温精度的情况下，关闭黑体的温控功能是一种更好的解决方法，对于红外扫描仪的遥感应用具有一定的指导意义。

Thus plasma expansion's effect of primary disk on secondary disk is reduced,and then the X ray radiation ablating secondary disk is "pure and clear".An X ray streak camera is used to measure time space images of double disk targets.

采用X光条纹相机测量双盘靶等离子体喷射的时空扫描图象，采用两台软X光谱仪分别对初级和次级辐射的X光进行测量，研究次级盘对初级发射的X光谱的改造。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。