Pulse Signal Distortion Characteristic in Erbium-doped Fiber Power Amplifier

1.Intr0ducti0nTheerbium-d0pedfibcrp0x`eran1[7lificrhasrecentlybcenal)I>IiedinmanyappIicd1,iclds.F0rasmallsignalinput,the0utputsignalclist0rti0nisalwaysnegligible.H0wever,ins0meapp1iedfie1dssuchasCATV,submarincc0mmunicati0nandl0calnetw0rk,itisneccssaryt0c0nsiderthepuIsesignaldist0rti0nbccausc0fthehighsignalinputp0wer(~UW).F0rthetw0kinds0fpu1sesignaI(T,XT,TpXT)x`'ithdifferentpulsex`idth,we0btainac10sed-f0rms01uti0nt0theph0t0ntransp0rtequati0nsandtherateequati0ns,andanalyzetheirnumericalca…     

在抑制强溶剂峰的条件下测量T_1值

当所测样品含有强溶剂信号时,由于主要谱线的动态范围受到严重限制,用常规的方法例如IR方法)测量T_1其精度将受到很大影响,而现有的脉冲抑制溶剂峰技术在用于T_1测量时都有一定的困难.本文提出了一种新的改进型IR方法,通过两次结果相加实现溶剂信号抑制后测量T_1,从而解决了上述困难.文中给出了该方法的理论说明,计算和主要实验结果,且与常规反转恢复法(IR)所获得的结果作了比较.     

大型精密仪器的在线测试维修技术

本文概述了国内外大型智能仪器维修工作的现场在线测试方法,介绍了各种主要新技术及方法的特点,谈了实际工作中的一些体会和看法,强调了在维修工作中采用新技术、新设备的重要性。     

脉冲相干激光雷达测距信号研究

对脉冲激光雷达外差测距信号进行了研究，理论上，采用调Q激光脉冲的数值计算波形，研究了脉冲激光经远处目标漫反向后进行外差接收的波形及其傅里叶变换频谱成分。实验上，研究了可调谐电光调Q射频激励波导CO2激光器脉冲激光经目标反射后的外差波形及其傅里叶变换频谱成分，并计算了目标的距离，理论分析与实验结果一致。     

Effects of Small Signal Injection on Laser Diode Pumped Hybrid Bistable System with Large Delay

Effects of small signal injection on an electro-optical bistable system with a very large delay are theoretically and experimentally investigated from the viewpoint of linear stability analysis. The resonance phenomena and frequency locking are observed when sinusoidal and rectangular small signals are additively injected into the system. Experiments confirm that theoretical results obtained by linear stability analysis are good predictions of the effects of both resonance and frequency-locking phenomena and show the dependence of these phenomena on the system parameters. As an application of the frequency locking phenomenon to the dynamical memory, the phase identification of the memory oscillation using the frame pulse externally injected is successfully executed.     

High-speed digital Golay code flaw detection system

A new, entirely digital, correlation flaw detection system is described which maintains optimal correlation detection over a much wider range of input signal-to-noise ratio conditions and operating speeds than previous single transducer correlation flaw detection systems. This new system uses special pseudo-random codes called complementary Golay codes to overcome the problem of self-noise which results from incomplete pulse-compression in the correlation process. Results are presented which show that the Golay code system produces better performance in the presence of grains and large reflecting surfaces, while offering much higher operating speed than previous single transducer correlation flaw detection systems.     

硅光电子开关测量高功率激光脉冲信噪比的问题讨论

采用50pps的激光脉冲,能量是20mJ/脉冲,在硅光电子开关中研究对材料硅的破坏。计算表明,这种破坏基本在表面,它与激光脉宽、光能流量和作用方式有关,结果与实验符合很好。     

光速调管FEL的小信号增益理论

 利用自由电子激光（FEL）纵模统一理论，系统地分析了光速调管FEL的小信号增益理论，并对色散参数Nd、束流能散度和发射度的影响进行了讨论。     

锁定放大器原理及应用实验的教学探讨

提出了锁定放大器原理实验应以掌握相关检测原理为重点，以观察、分析相敏检波器的相位特性为主要内容的建议，阐述了应用实验内容的选取原则，并设计了两个应用实验方案。     

静电陀螺数字式小角度读出系统研究

本探讨了一种用于静电陀螺的小角度光电信号读出的全数字方案，通过对比、分析和讨论，说明数字化静电陀螺小角度读出方案的优越性，并提出了针对静电陀螺光电读出系统随机误差的修正算法。