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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。

Based on fiber Bragg grating, the authors develop an on-line temperature monitoring system for power cables and measure outer surface temperature of cables under different laying modes; analyze the relation among cable temperature, ambient temperature and load of cable lines.

为此设计了基于光纤光栅的电缆温度在线监测系统，实测了不同敷设方式下电缆的表皮温度；分析了电缆温度与环境温度以及线路负荷间的关系；采用等效热路法，由监测到的电缆表皮温度拟合出电缆的实际载流量，实现了对电缆温度及载流量的在线监测，确保电缆运行的安全性与经济性。

Further analysis shows that this is caused by the long-period fiber gratings phase matching condition,which is different from that of Bragg grating.

进一步的分析指出，这是由长周期光纤光栅不同于Bragg光纤光栅的相位匹配条件决定的。

In the phase measurement technology based on grating projection, there are some difficulties such as: the method of projection, phase unwrapping algorithm and 3-D coordinates calibration.

在光栅投射相位测量技术中存在着几个难点，例如：投影方式、相位去包裹算法和3－D坐标标定。

In the course of the research of modulation measurement based on phase shift techniques, this paper gives the programs on error margin analysis of the phase shift and the function analysis of grating, and analyzes facts that phase shift error has some effects on obtaining modulation value.

在研究基于相移技术的调制度测量原理中，编写了相移误差分析及光栅性能分析的程序，并分析了相移误差对获取调制度信息的影响。

When the axis turns with the most grating, photoelectric cell's signal is sin wave.

当轴转用最光栅、光电电池的仲波信号。

The phase grating is realized with photolithographic IC technique. Three different methods to realize phase gratings are discussed.

用光刻法实现了这一位相光栅，并比较了不同位相光栅制作法的优缺点。

The phase grating is realized with photolithographic IC technique.

用光刻法实现了这一位相光栅，并比较了不同位相光栅制作法的优缺点。

Starting from these basic problems, we described the photosensitivity of fiber and writing technology of fiber grating.

论文首先从这些基础性的问题入手，描述了光纤的光敏性和光纤光栅的写入技术，并对光纤光栅的波长敏感特性进行了讨论，利用相位-应变-温度模型分析了光纤Bragg光栅的应变、温度、压力敏感特性。

The results of calculation and measurements have been demonstrated by the experimental researches on photosensitivity and grating performance of chalcogenide fiber.

在详细了解和分析硫系玻璃材料性质的基础上，对硫系光纤的基本特性、特殊工艺、光纤的基本实验方法进行了理论和实验研究。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。