查询词典 gratings

Howitt Korea Information Co., Ltd. was established in May 1999, located in Daejeon Metropolitan City, Korea Chang-dong Yuseong No. 59-3, Daedeok Valley Science and Technology Parks famous optical components company, specializing in the production of camera are low pass filter, infrared cut-off filters and gratings, spectroscopic and tape products such as high-tech enterprises in Korea have been successfully listed.

韩国哈威特信息株式会社成立于1999年5月，位于韩国大田广域市儒城区长洞59-3号，大德谷科技园著名的光学元器件公司，是专业生产摄像头低通滤光片、红外截止滤光片及光栅、分光镜以及tape等产品的高科技企业，在韩国已成功上市。

A new method of inscribing diffraction gratings by using a focused near-IR 800 nm femtosecond laser ablating gold film on glass substrate was reported.

提出了一种新的制备光栅的方法，利用800 nm的飞秒激光扫描蒸镀在石英玻璃衬底表面的金薄膜，通过烧蚀金薄膜在衬底表面形成衍射光栅。

He is made the offering of "kozhakkattais"(Steam cooked Rice-balls encapsulating a mix of jaggery and coconut gratings cooked in ghee).

他是提供了对" kozhakkattais "（蒸米饭球封装的混合棕榈糖和椰子光栅煮熟的酥油）。

The influence of groove number of gratings and the optical thickness of the resonant reflector upon linewidth are discussed.

得到光栅照射条纹数和谐振反射器光学厚度对线宽的影响，理论和实验符合。

Results of this thesis indicate that the novel polymer DFB gratings fabricated via UV-photopolymerization can achieve high refractive index modulation and low surface relief. Since this method has obvious predominance over other fabricating methods, it is believed to have promising application future in the organic semiconductor lasers.

本论文的研究结果表明，基于紫外光聚合反应的新型聚合物光栅可以实现较高的折射率调制幅度，和很低的表面起伏深度，相比其它有机DFB光栅的制作方法具有明显的优势，因此在有机半导体激光器的制作中具有很好的应用前景。

Experimental results show that the refractive index modulation can reach about 0.010; and the depth of surface relief is low to about 0.7~12.4nm, which will be lower than 1nm in the gratings with 200~400nm period(according to the first-order and second-order DFB grating period of organic semiconductor lasers).

实验结果表明，折射率调制幅度较高，可以达到0.010左右；表面起伏很低，约0.7~12.4nm，在周期为200~400nm(对应于有机半导体激光器的一级和二级DFB光栅周期)的聚合物光栅中，表面起伏深度小于1nm。

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。

Based on Kogelnik's one-dimensional coupled-wave theory and dispersed Fourier transform, the diffractive characteristic of two pieces of volume phase gratings, which are cascaded and having orthogonal grating vectors for the continuous-wave laser beam, is analyzed.

利用Kogelnik一维耦合波理论，以及离散傅里叶变换，分析光栅矢量相互正交，且串联级联放置的两透射型体相位光栅对空域任意分布的连续激光光束的衍射特性；讨论其对入射光束的空间低通滤波性能，并具体模拟其对畸变高斯光束空间低通滤波的效果。

In this thesis, the rigorous coupled wave analysis is used to simulate the overlaid gratings.

本论文是以严格耦合波理论来分析叠对光栅的各项参数。

A fast simulation method for sampled fiber Bragg gratings with periodic index distribution .

折射率周期分布取样光纤Bragg光栅的快速分析方法。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。