查询词典 Bragg diffraction

The elements of optical waveguide strain-stress measurement and fiber bragg grating strain-stress measurement system based on wavelength division multiplexing and spatial division multiplexing are emphatically discussed; the displacement regularity of stress field induced by roadway group excavating and short wall mining process is analyzed in detail; the concept of roadway "equivalent radius","correcting coefficient of coal and rock mass mechanical parameters",and "mining affecting coefficient" is put forward; the calculation method of "equivalent radius", the method of inversion of "correcting coefficient of coal and rock mass mechanical parameters", and the "mining affecting coefficient" determination method with the field measurement results and so on are provided.

重点研究了光波导应力应变测量原理，以及基于波分复用和空分复用技术基础上的布拉格光纤光栅应力应变测量体系；详细分析了近距离巷道群开掘工作和短壁体系回采工作诱发的应力场的重新分布规律；提出了巷道"当量半径"、"煤岩体力学参数修正系数"、"采动影响系数"等概念；给出了"当量半径"的计算方法、"煤岩体力学参数修正系数"的反分析求算方法、以及通过现

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Fiber Bragg grating; reflection wavelength ; high temperature characteristic ; temperature sensitivity coefficient

光纤布拉格光栅；反射波长；高温特性；温度灵敏度系数

Lost and cost are two problems which are difficult to be resolved coinstantaneous in Fiber Bragg grating reflection signal pickup. We analyzed the spectra transmission characteristics of FBG Sagnac loop with coupled mode theory , and discussed the affection of optical path difference to its transmission.

论文利用模式耦合理论，对光纤Bragg光栅Sagnac环的传输特性进行细致的讨论，分析了光程差对其传输特性的影响，并提出了光纤光栅Sagnac环包络带通滤波器的概念，指出其在光纤光栅反射信号提取中的低损耗和低代价的特性，最后通过实验研究验证了理论上的分析和构想。

In recent years, the fiber grating external cavity semiconductor laser regarded as one of the candidate light sources of DWDM systems, has received considerable attention. Usually, it is thought that the lasing wavelength of a FGESL is locked at the Bragg reflection wavelength of fiber grating.

由于FGESL的激射波长主要由光纤光栅的布拉格波长确定，因此选择具有合适布拉格波长的FG就能使FGESL的激射波长处于预置波长处；同时，由于FG的布拉格波长受温度变化的影响相对较小(～0.01nm／℃)，因此FGESL与DFB-LD相比具有更高的温度稳定性。

The location of reflection spectrum varies with the grating period (corresponding to the Bragg wavelength of FBG), thus, by changing the grating period, the reflection spectrum of SFBG can be shifted by one wavelength spacing or more.

通过改变光纤光栅周期(对应光纤光栅布拉格波长)到适当的值，使超结构光纤光栅谱位移一个或者多个波长间隔，级联多个波长精确定位的超结构光纤光栅，实现了波分复用信道滤波器的宽带滤波。

The power-referenced refractometer based on tilted fiber Bragg grating is investigated theoretically by complex mode coupled mode theory.

利用复模式耦合模理论分析了基于闪耀光纤布拉格光栅功率检测的折射计中不同设计参数对折射计性能的影响。

To compare results of numerical model with experimental data, we summarized some characteristics of Bragg reflection. We found that the reflection band is wider in irregular waves than that in regular waves. The reflection coefficient was higher when waves propagated over the composite submerged breakwaters.

本文同时根据数值和实验之结果，归纳、探讨各种布拉格反射现象可能之影响因子，发现不规则波之情况下，布拉格反射之带宽较宽，且在复合式间距的潜堤布置之下，反射效果优於等间距之布置。

For the former structure ,and if the resonance Bragg-scattering is satisfied, the relative localization length attains a minimum.

考察前一种结构，且满足共振布拉格散射条件，相对局域化长度达到最小值。

The activity of his research group has been dedicating to the quantum control of the photons with resonant photonic lattices. They have proposed the ways to slow, storage and release of femtosecond laser pulses in Resonantly Absorbing Bragg Reflectors.

近年来致力于光子在共振晶格结构中的量子操控，提出了一维共振吸收布拉格反射镜中超短激光脉冲的受控减速、静止、释放以及静止光场的非线性光学频率转换等新概念与新方法。

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。