光栅

So chirped fiber gratings have broad reflection bandwidth. The group delay in chirped fiber grating reflection bandwidth changes gradually. These properties are what other type fiber gratings do not have.

所以chirped光纤光栅具有宽的反射带宽，在反射带宽内具有渐变的群时延等其它类型的光纤光栅所不具备的特点。

A reflection type diffraction grating according to the present invention has a structure in which a metal film as a first layer with reflectance not lower than 30 % with respect to the wavelength of incident light and a transparent dielectric film as a second layer are laminated successively on the surface of the reflection type diffraction grating.

本发明的反射型衍射光栅的结构以金属膜为第一层，相对于入射光波长，具有不低于30％的反射率，以透明绝缘膜为第二层，所述第一和第二层依次被层叠在所述反射型衍射光栅的基底表面上。

Based on the rigorous coupled wave theory, the phenomenon that the zero order reflection efficiency of rectangular subwavelength grating varies with the wavelength is studied when incidence angle , azimuth and grating parameters are variant.

摘要从严格耦合波衍射理论出发，在不同入射角、方位角和光栅参数下的情况，计算了矩形亚波长光栅零级反射效率随入射光波长的变化。

In discussing the properties of reflection and refraction of fiber grating, the coupled-mode equation, envelope function, transform matrix formalism, multilayer and optical path approximation are used for describing the linear and nonlinear characteristic of optical fiber grating.

在分析光栅的反射和透射规律时，采用了耦合模式法，包络函数法，转换矩阵法，多层介质薄膜法以及光程法，这些方法虽然具有不同的数学和物理模型，但在分析光纤光栅这一特殊的波导结构时，可充分展现它的线性和非线性特性。

Under the oblique incidence cases, the optical path difference of light beam distributed on the edge of steps can be calculated by using the geometric method. Then, according to the multi-slit Fraunhofer diffraction, the expression of diffraction intensity of reflection step grating is deduced.

针对反射性阶梯光栅，利用几何方法计算出斜入射情况下光束在台阶边缘的光程差的分布情况，根据多缝夫琅和费衍射推导出反射型阶梯光栅的衍射光强表达式。

Based on the rigorous coupled wave theory,the phenomenon that the zero order reflection efficiency of rectangular subwavelength grating varies with the wavelength is studied when incidence angle,azimuth and grating parameters are variant.

从严格耦合波衍射理论出发，在不同入射角、方位角和光栅参数下的情况，计算了矩形亚波长光栅零级反射效率随入射光波长的变化。

The system controls a tunable fiber Fabry-Perot filter with sawtooth wave voltage and synchronous signal of its digital phase to interrogate FBG sensors in a single fiber. Meantime, a reference FBG and a digital thermometer provide an accurate reference wavelength, which is used to calibrate the wavelength readout of the TFFP in real-time by a digital signal processor.

解调系统利用锯齿波电压信号和数字相位同步信号控制可调谐光纤法布里珀罗滤波器，对光纤光栅传感器阵列进行扫描式寻址，同时采用非测量环境中的参考光栅和数字温度计提供精确的参考波长，并由高速数字信号处理器实时校准滤波器的波长读取值，很好地消除了滤波器调谐的温度漂移、非线性和蠕动性引起的测量误差。

Based on Matlab, simulation program of grating diffraction is complied. By changing adjustable parameters, computer simulations of white light interference and diffraction experiments (i. e., grating diffraction, single slit and double-slit diffraction, double-beam and multi-beam interference experiments) can be achieved.

基于Matlab软件编写出白光光栅衍射仿真程序，通过改变可调参数实现白光干涉、衍射实验（包括：光栅衍射、单缝及双缝衍射、双光束及多光束干涉等）的计算机仿真。

So, with the function, the phase shift method can not only reduce the effect of fringe error and non sinusoidal irradiance function, but also impr.

考虑到光栅投影测量中可能出现的标定误差、投影光非正弦模式以及其他干扰因素，在该函数中加入对这些干扰的纠正值，从而减少由这些干扰产生的不利影响，进一步提高投影光栅和对象测量的精度。

The results can explain the diversity of spectral property and the experimental bandwidth wider than that calculated.

这些结果可以解释实验测得的全息光栅衍射光谱带宽较宽和光栅衍射光谱的多样性。

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