查询词典 diffraction grating

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。

It can get the three-dimensional profile of the object surface effectively. Because of the cragginess of the three-dimensional surface when sine grating is projected the image of the sine grating is modulated and the modulated image is taken by a CCD camera with an angel compared to projecting direction. After the phase shift measuring method, the phase is gotten. Because the phase is calculated by the phase shift measuring ranges from –π to +π it isn't continuous. The phase unwrapping is necessary to recover the continuous phase about the object shape.

这种方法采用结构光照明，将正弦光栅图像投影到被测物体表面，用与投影方向成一定角度的CCD摄像机获取受物体表面面形调制的变形光栅像，根据数字相移算法计算出相位分布，由于从相移计算的相位被截断在反三角函数的主值范围内，因而是不连续的，必须通过相位展开恢复出连续相位分布，由相位－高度关系最终求出物体轮廓的三维数据信息。

Because of the cragginess of the 3-D surface, the distortion stripes appear when the common rectangular grating or sine grating is projected onto the object surface, which includes information about the 3-D surface profilometry. The images including distortion stripes are taken by CCD camera. The 2-D stripes information is got after processing these images. On the basis of mathematic reconstruction model and arithmetic, the 3-D surface profilometry data are gotten.

用普通白光将矩形光栅或者正弦光栅投影于被测物体表面上，由于物体外形凹凸等几何形状变化而在物体表面产生畸变条纹，这些畸变条纹就包含了物体表面形状的三维信息，由CCD摄像头摄取这些畸变条纹信息，对这些图像进行相应的处理，得到有关条纹中心线的二维信息，然后再根据相应的数学转换模型和重构算法对物体的轮廓进行重构，就可以得到被测物体表面的三维外形数据信息。

Because of the cragginess of the 3-Dsurface, the distortion stripes appear when the common rectangular grating or sine grating is projected onto the object surface, which includes information about the 3-Dsurface profilometry. The images including distortion stripes are taken by CCD camera. The 2-D stripes information is got after processing these images. On the basis of mathematic reconstruction model and arithmetic , the 3-D surface profilometry data are gotten.

用普通白光将矩形光栅或者正弦光栅投影于被测物体表面上，由于物体外形凹凸等几何形状变化而在物体表面产生畸变条纹，这些畸变条纹就包含了物体表面形状的三维信息，由CCD摄像头摄取这些畸变条纹信息，对这些图像进行相应的处理，得到有关条纹中心线的二维信息，然后再根据相应的数学转换模型和重构算法对物体的轮廓进行重构，就可以得到被测物体表面的三维外形数据信息。

The spectrum of fiber Bragg grating can be controlled by double exposure technique. The first exposure is used to control the resonant wavelength of fiber grating by directly irradiating the naked photosensitive fiber.

该方法只使用普通Bragg位相模板，采用两次曝光技术，通过控制光纤光栅的本地谐振波长和反射率，达到控制光纤光栅谱形的目的。

Rigorous first order vector couple-wave theory of planar grating are expanded to more complicated surface-relief grating case.

从计算结果可以看出：在特定的条件下，光栅可以达到非常高的衍射效率，理论上接近100％。

Behind the grating, behind the shutter, one perceived so far as the grating permitted sight, a head, of which only the mouth and the chin were visible; the rest was covered with a black veil. One caught a glimpse of a black guimpe, and a form that was barely defined, covered with a black shroud.

你会在铁栅栏所允许的限度内望见在铁栅栏和板窗的后面，出现了一个人头，你只能看见嘴和下巴颏儿，其余的部分都遮没在黑纱里了。

With advanced production equipment and technology, domestic maxillary first grating of CAD design system, can provide the perfect grating layout design.

拥有先进的生产设备和技术，国内颔先的CAD钢格板设计系统，可为用户提供完美的钢格板布置设计。

Osmometer. Fiber grating sensor is a new generation of international fiber-optic sensor, with the nature of explosion-proof, anti-strong electromagnetic interference, anti-lightning, can easily use the WDM technology in a single fiber in the series Multiple fiber Bragg grating sensor, thus forming quasi-distributed measurement and so on.

光纤光栅传感器是目前国际上新一代光纤传感器，具有本质防爆、抗强电磁干扰、防雷击，能方便地使用波分复用技术在一根光纤中串接多个光纤光栅传感器，从而形成准分布式测量等优点。

To provide optical fiber: Fiber Distributed Temperature Stress Test System, Fiber Distributed Temperature Measurement System, Fiber Bragg Grating Health Monitoring System, fiber optic geophone systems, fiber Bragg grating wavelength calibration instrument and so on, which sensor product line is extremely rich and has industry representation, including: fiber optic temperature hygrometer, fiber-optic gas alarm, fiber-optic magnetic field sensors, optical fiber vibration sensor, fiber-optic high temperature pressure sensors, fiber-optic WIM system , fiber optic strain gauge welding, fiber optic embedded strain gauge, optical soil pressure gauge, fiber reinforcement meter, fiber optic pressure ring, fiber-optic displacement meter, fiber cracks meter, fiber optic osmometer, fiber-optic temperature sensor high temperature , optical fiber cable meter and so on.

北京达卡科技有限公司光纤方面提供：光纤分布式应力温度测试系统、光纤分布式温度测试系统、光纤光栅健康监测系统、光纤地震检波系统、光纤光栅波长校验仪等，其中传感器产品线极为丰富和具有行业代表性，包括：光纤温湿度计、光纤瓦斯报警器、光纤磁场传感器、光纤振动传感器、光纤耐高温高压传感器、光纤动态称重系统、光纤焊接式应变计、光纤埋入式应变计、光纤土压力计、光纤钢筋计、光纤压力环、光纤位移计、光纤裂缝计、光纤渗压计、光纤耐高温温度传感器、光纤钢索计等。

The teacher likes the honeymouthed little girl very much.

老师很喜欢这个嘴甜的小姑娘。

Mr. Notker Bien's interests are traveling, spending quality time with the family and long-distance-running.

诺特卡·柏恩先生热爱旅游，长跑，以及和家人一起共度美好时光。