基于啁啾光纤光栅的光栅内传感

本文在以基于光纤布拉格光栅（FBG）的传感器的基础上,介绍了啁啾光纤光栅（CBG）的光学特性、基于啁啾光纤光栅的光栅内传感的概念和在此基础上实现传感的途径。     

一种进口胶粘剂溶剂的剖析

采用化学法和FT IR、GC/MS等现代测试技术 ,分析、测定了透明型光学用胶粘剂 (简称光学胶 )溶剂的化学结构为苯乙烯 (C6 H6 CHCH2 ) .     

电流互感器的极性及其接线

本文分析了电流互感器的极性及二次接线的原则,同时结合一些典型实例进行了分析     

一维无序光子晶体的光学透射特性

用时域有限差分法研究一维无序光子晶体的光学透射特性．结果表明：大折射率层无序和小折射率层无序对光子晶体的透射特性都有影响,但前者影响比后者更显著;当晶格常数不变时,其透射特性与随机分布有关,高频禁带的边缘向波源中心频率拓展,但与涨落系数的变化几乎无关．     

我国综合性文献光盘数据库的比较研究

我国综合性文献光盘数据库的比较研究●何建新ＡＢＳＴＲＡＣＴＡｃｏｍｐａｒａｔｉｖｅｓｔｕｄｙｉｓｃｏｎｄｕｃｔｅｄｏｎｔｈｅｔｗｏｋｉｎｄｓｏｆｄｏ－ｍｅｓｔｉｃｃｏｍｐｒｅｈｅｎｓｉｖｅｏｐｔｉｃａｌｄｉｓｃｄａｔａｂａｓｅｓ：ｔｈｅ＂ｄａｔａｂａ...     

Characterization of a-Si:H/SiN multilayer waveguide polarization using an optical pumping application—LED

This paper describes the fabrication of a waveguide and the analysis of its polarization characteristics by applying light-emitting diode （LED） pumping lights to its surface. By using double tubed coaxial line （DTCL） microwave plasma chemical vapor deposition （MPCVD） equipment, an a-Si：H/SiN multilayer waveguide was fabricated whose thickness could be controlled at nanometer order. The main structural material of the waveguide sample consisted of a combination of layers of amorphous silicon hydrogen and silicon nitrate. Once the sample was ready, another major objective of the experiment was to analyze the polarization characteristics of the fabricated waveguide. The idea of the experiment was to analyze how the waveguide reacts when three types of LED （blue, yellow, and red） are radiated onto its surface. The results showed that the fabrication of the a-Si：H/SiN sample is successful. Most effective transmission results, which accord with the polarization characteristics analysis, were obtained.     

In-vivo retinal imaging by optical coherence tomography using an RSOD-based phase modulator

Fourier-domain rapid scanning optical delay line （RSOD） was introduced for phase modulation and depth scanning in a time-domain optical coherence tomography （TD-OCT） system. Investigation of parameter optimization of RSOD was conducted. Experiments for RSOD characterization at different parameters of the groove pitch, focal length, galvomirror size, etc. were performed. By implementing the optimized RSOD in our established TD-OCT system with a broadband light source centered at 840 nm with 50 nm bandwidth, in vivo retina imaging of a rabbit was presented, demonstrating the feasibility of high-quality TD-OCT imaging using an RSOD-based phase modulator.     

基于OpenGL的三维图形绘制和3D建模

介绍了利用OpenGL实现三维图形绘制的基本编程框架和方法,对OpenGL中光照、材质、投影等关键技术的应用方法进行了重点阐述。简要介绍了利用3D Studio Max构建复杂模型,以降低用OpenGL构造复杂模型难度、减少建模工作量的方法。     

光无源接入网络发展方向

FTTH是宽带接入网发展的必然趋势,OFDM-PON作为一种容量大,成本低、安全性高、易于管理的接入网技术,被认为是高速、安全接入的一种最佳解决方案,文章介绍了当前的GPON、EPON、WDM-PON和OFDM-PON的原理及优缺点,综合考虑应用场景和未来需求情况下提出OFDM-PON将会是接入网的最佳解决方案。     

Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions

This paper presents a unified positive-and negative-sequence dual-dq dynamic model of wind-turbine driven doubly-fed induction generator(DFIG) under unbalanced grid voltage conditions. Strategies for enhanced control and operation of a DFIG-used back-to-back(BTB) PWM voltage source converter(VSC) are proposed. The modified control design for the grid-side converter in the stationary αβ frames diminishes the amplitude of DC-link voltage ripples of twice the grid frequency,and the two proposed control targets for the rotor-side converter are alternatively achieved,which,as a result,improve the fault-ride through(FRT) capability of the DFIG based wind power generation systems during unbalanced network supply. A complete unbalanced control scheme with both grid-and rotor-side converters included is designed. Finally,simulation was carried out on a 1.5 MW wind-turbine driven DFIG system and the validity of the developed unified model and the feasibility of the proposed control strategies are all confirmed by the simulated results.