二极管对

The effects of cylindrical lens shape and the laser-fiber distance on relative coupling efficiency are also studied.

给出了一个计算980 nm泵浦激光二极管与柱形透镜光纤耦合角向容忍度的理论模型，并选择圆形的柱透镜光纤进行数值计算，得出了在水平和垂直方向上偏转加平移时的相对耦合效率及绕光纤轴向转动的相对耦合效率的数值计算结果并加以分析，同时也研究了光纤透镜的形状和激光二极管与光纤的间距对相对耦合效率的影响。

First the traditional non-optical detection technology for gas concentrations is briefly introduced, such as ultra-sound technology, gas sensing, catalytic thermal, gas chromatography, interferometry applications, and then the spectral analysis based on the concentration of gas detection is discussed. The latest technological developments on the differential absorption spectroscopy, Fourier transform infrared spectroscopy, tunable laser diode laser absorption spectroscopy, laser radar and differential absorption Raman scattering laser radar, laser-induced fluorescence spectroscopy, laser Photoacoustic Spectroscopy are reviewed in detail.

首先对传统的非光学气体浓度检测技术作出了简单的介绍，包括超声波技术、气敏法、热催化法、气相色谱法、干涉法应用技术，被动检气管法，然后重点阐述了基于光谱学分析气体浓度检测技术的最新发展动态，其中分别对差分吸收光谱技术、傅里叶变换红外光谱技术、可调谐激光二极管激光吸收光谱技术、差分吸收激光雷达和拉曼散射激光雷达、激光诱导荧光光谱技术、激光光声光谱技术进行了详细介绍，最后提出了现代气体浓度检测技术的发展方向。

In chapter 4, a study of GaAs FET doubler is presented, and experimental verification the doubler is work well in Ka-band.

首先对肖特基二极管做了简介，然后对已有的混频器电路做了比较，最后设计了Ka频段平衡混频器。

With its simplest structure –PN junction, the diode has been studied in this paper as an example for making an explanation on the physical quantity and relevant mathematical expression corresponding with respective parameter of SPICE model in the library of simulation software.

文章以结构最简单的二极管PN结作为研究对象，旨在对与仿真软件的元件库中各元件的SPICE模型参数相对应的物理量及数学表达式加以解释和说明，并就这些参数如何反映二极管的电气特性这一问题作了一定的分析。

In order to control the temperature of the laser-diode ,a semiconductor cooler ——— PELTIER is applied and the technique of fuzzy and PI control method are adopted either.

利用半导体致冷器对大功率激光二极管进行致冷和精密温控，采用模糊控制与PI 控制相结合的方法，构造了激光二极管的全固态致冷系统。

The article research the relative project about visibility, it discussed the principle, it introduced the new measuring method opposite the foreword scattering visibility meter and design the transmit and incept devices of foreword scattering visibility for keystone, it is advanced the characteristics of the light source which is should be possess , it show the advantage of the LED used to the light source and selected PIN LED which matching with it, the article is discussed the optics system and design the reasonable object lens structure, measuring and controlling system and the relative design idea ,design method and the accuracy analyzing etc.

本文研究了能见度测量仪器的有关问题，系统地论述了能见度测量仪器的理论，然后以前向散射式能见度仪为研究对象，论述一种新的测量方法，提出了理想光源应具备的特点，说明了采用LED 发光二极管做光源的优越性，并选择了合适的PIN 光电二极管与之匹配，对光学系统作了全面讨论，设计出合理的物镜结构、机械结构、并详细论述了与之有关的设计思想、设计方法和精度分析等问题。

For a futher research on the natural gas and minimizing the detector,we measured the spectrum lines which may affect the detection of CH4 near 1.65μm and 1.68 μm accurately by using the TDLAS theory.Then we set up an sinal acquiring and processing system based on LABVIEW,which can aquire and filter the digital signal and an interfix arithmetic is also used to get the final result.

本论文以近红外二极管激光吸收光谱技术为基础，在1.65μm和1.68μm附近对乙烷的谱线进行了准确测量，分析了乙烷谱线对甲烷测量的影响，编写了基于LabVIEW的数据采集及处理分析系统，利用该系统实现了对探测信号的采集、滤波以及对波形的相关运算并得出最终结果。

Some technical problems arose during the debugging of the accelerator. The ion source did not produce arc. The accelerator tube cracked. The control system was out of order. The transporting capacity of the charge belt degraded. The corresponding reasons were analyzed and some measures were adopted to solve the problems. The drawing voltage was raised to its predetermined position after the ion source produced arc and should be reduced to zero before turning off the accelerator. Transition flange was lathed and the accelerator tube was re-assembled. The control equipment at high voltage was shielded. TVS diodes were installed at the input and output ends.

调试中出现了离子源不起弧、加速管破裂、控制系统失灵和输电带输电能力降低等技术问题，分析了出现这些问题的原因，然后分别采取了相应的措施加以解决：变换工作流程，在每次关机前先把引出电压降为零，开机时等离子源起弧后再把引出电压升到预定值；对过渡法兰进行车加工，重新封装；对高压端的控制设备采取屏蔽措施，在输入、输出端使用TVS二极管，对控制软件进行抗干扰设计；对绝缘气体进行循环干燥等。

In this thesis, Based on the advantages of diode-pumped solid-state laser in Chapter 1, the development of diode-pumped solid-state laser is introduced. The trends of DPSSL are pointed out, the wide application fields ,as well as the bright market future of high power DPSSL are also summarized. In the Chapter 2 , all kinds of solid-state laser gain materials are introduced in detail. In the Chapter 3 , the theory on the mode-matching of the pump beam and the cavity mode is analyzed in detail based on the basic theory and work principle of LD-pumped all-solid-state laser.

本论文第一章从二极管泵浦固体激光器的优势出发，介绍了二极管泵浦固体激光器的发展，指出了DPSSL的发展方向，概括介绍了大功率DPSSL的诸多应用领域和广阔的市场前景；第二章对固体激光增益材料作了详细的介绍；第三章基于LD泵浦固体激光器的基本理论和工作原理，从理论上详细分析了LD端面泵浦激光器中泵浦光与腔模的匹配问题。

In this paper, a simple, accurate and intuitionistic formula and method for calculating and analyzing the I-V characteristics of a pn junction is deduced. The method is used to calculate and analyze the I-V and RD-V characteristics of two typical HgCdTe loophole junctions. Some important parameters which reflect the characteristics of a diode, such as surface Ohm leakage conductance and the distribution of the ideal factor n with voltage are obtained.

本文推导了一种可简便、准确、直观计算和分析pn结I-V特性的公式和方法，并应用该方法对两类典型HgCdTe环孔pn结的I-V、RD-V特性进行了计算和拟合；得到了表面欧姆漏电导、二极管理想因子n随电压的分布等反映二极管结特性的重要参数。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷