查询词典 fringes

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。

In chapter 2 the principle of moire fringes is discussed.

尤其是针对实际运用中所遇到的困难进行改进和完善。

The appearance of Moire fringes is described and analyzed.

3讨论了HDRI系统中莫尔条纹的产生以及消除系统中莫尔条纹的方法。

One reason is that the Communist Party fears that allowing political freedom to flourish on its fringes would loosen its ability to monopolise power in China as a whole.

一个原因是共产党担心允许政治自由的生长将使一党专政控制国家的能力减弱。

Newton's ring ; transmitted light ; interference fringes ; visibility

但在实验中不易观察到透射光的干涉条纹，其原因主要是透射光的干涉条纹可见度太小，不易分辨

The distribution of the interference fringes and its change with respect to the change of optical path difference are analysed and some of its applications are also introduced.

本文介绍了泰曼-格林干涉仪的一种变形，分析了在这种情况下所获得的干涉条纹的分布，及其随光程差变化而变化的规律，并介绍了它的应用。

Intricate internal layered panels are offset with bold curvaceous fringes, colours are in pique, where interlocking repeated patterns of triangles and diamonds are infused with the couture shades of powder blue and periwinkle; soft peach and oyster; white gardenia and sea grey, fuschia and persimmon.

内部交错层叠的发片和极富线条感的醒目刘海相呼应；此季的颜色丰富炫目，反复运用的三角与钻石形区块中注入了特别调制的粉蓝色与玉螺色；柔和的桃色与牡蛎色；栀子花色与海灰色；梅红与柿色，使得整体发色交合有致。

Secondly, the visibility of interference fringes is increased by raising reflectivity of uppersurface of glass plate and convex of plane convex lens.

垂直入射平行光I经多次反射和折射后，形成光束Ⅲ和Ⅵ，二者迭加而产生干涉，即所谓透射光的干涉。

Experiment with He-Ne laser and white light for interference, focus on the fringes of the changes and the two plane mirror and the parallel degree from the relationship.

实验中以He-Ne激光和白光干涉仪为干涉光源，重点讨论条纹的变化与两个平面镜的平行度及距离的关系。

Astronomers announced the discovery of a new planetoid in the Kuiper Belt, an asteroid belt located in the outer fringes of our solar system.

天文学家宣布，他们在太阳系外缘的小行星带"柯伊伯带"中发现了一颗新的小行星。

It is also known as one of the most poisonous naturally occurring substances.

它也被称为一个最自然发生的有毒物质。

The greatest stress is found at the location on the cross section where V is the largest.

最大应力出现在横截面上V为最大的地方。