Two wedge interferometers are designed that the thickness of one is higher than the other . so when the incident coherent light through the interferometers can acquire two fringe patterns which having space shift , but the incident incoherent light only result in consistent intensity signal . through a differentiating amplifier , two signals subtract which can eliminate noise of background and result in higher contrast ratio fringe signals . this method largely improves the system and the ability of detection . the spacing of line fringes is a function of incident laser wavelength , by analyzing , we can extract the wavelength of incident laser . the optical unit analyzing and results also simulated with matlab 当背景光入射时，直接穿过干涉仪，仅发生强度的衰减，在两个探测平面上产生幅度基本一致的灰度信号，通过差分放大器，相消为零，从而抑制了背景干扰。当激光信号入射，穿过干涉仪时受到调制，在探测平面上产生干涉条纹。通过所设计的存在平均厚度差的双楔形干涉仪，两路干涉条纹图案出现相对移位：在两个探测平面对应的位置上，一路出现亮纹，另一路出现暗纹。
( 5 ) the intensity and s / b of libs are investigated in detail at the different buffer gas , gas pressure , and laser power . the results show that under the 120 mj laser energy , for ar the best s / b is at 200 torr pressure , but for air at 100 torr and he at 300 torr . duration of atomic spectra in ar is longer than that in air ( 5 )实验测定了不同的缓冲气体和气压以及不同的入射激光脉冲能量对原子谱线强度和背景光的影响，结果显示在氩气环境下，当气压约为200torr 、激光的能量约为120mj时， libs的s b最大；在空气和氦气中获得最佳s b时的气压约分别为100torr和300torr ；原子谱线在氮气环境中持续的时间要比在空气中持续的时间长。
The double - frequency laser interferometer belongs to the heterodyne interferometer . it has been proved that this kind of interferometer possesses the advantage of having a higher transform gain , better wave - filter capacity and high spatial resolution . furthermore , this kind of interferometer can filter out background light interference and obtain a measuring signal with high signal / noise ratio 双频激光干涉仪是一种外差干涉仪，理论分析证明：外差干涉具有高的转换增益、良好的滤波性能及优异的空间鉴别能力，能有效地滤除各种背景光干扰，得到信噪比很高的测量信号。
The paper analyzes in detail the mechanics and optics theory . in the light of the characteristic of the intensity modulation optical fiber sensor , the reference - way is presented to compensate the error signals which are caused by the bias light , dark current of photoelectric detector , temperature drift of pre - amplifier 文中详细分析了这种传感器的力学和光学工作原理，并且针对所选用的强度调制型光纤传感器的工作特点，提出采用参考通道补偿由于背景光、光电探测器的暗电流、前置放大器温漂等因素引起的误差。
By calculating parameters including the link length , the azimuth angle , the elevation , the optical power that the inter - satellite optical cdma communication system will receive , the variation range of the azimuth angle and the elevation from the optical antenna of atp are understood well . by analyzing the factors to impact bit - error - rate ( ber ) from the received power , multi - user disturbing , background noise , wavelength , bit rate etc , measures to guarantee high performances of the system are obtained , especially those for smoothing the fluctuation of the received optical power from host platform vibration 分析研究了卫星光cdma通信系统中卫星仰角、方位角和距离,给出了探测器能够接收到的光功率以及atp子系统捕获及跟瞄的范围;对卫星光cdma通信系统性能模型和基于卫星振动系统性能模型的研究,分析了多用户干扰、接收光功率、背景光噪声、振动偏差以及码速率对系统误码率的影响,给出了相应的改进措施。
According to the static experiment of one dimensional psd , the restraint circuit of background light of psd is improved and two dimensional measuring device is completed . moreover the virtual instrument is employed as measuring platform to acquire and process data . the paper can be a reference of the three dimensional coordinate measurement 在一维psd位置检测静态实验装置的基础上，设计完成了二维检测装置，改进了psd背景光的抑制，并利用虚拟仪器作为测量平台进行二维空间测量和数据处理，为三维研究奠定了理论和实验基础。
Some by - products of this work can be used as routine tools in the uv laser laboratory . commercial video ccd cameras are used to image uv laser and soft x rays , window glass as a fluorescer is used to indirectly measure the uv laser beam profile with high energy density , and a special glass which permits uv light to pass through while absorbs the visible , is introduced into the uv beam profiling in strong visible stray light environment 实验中发展了一些测量技术，例如用可见光视频ccd直接测量紫外激光的光束分布和激光等离子体产生的x光二维图象，利用窗玻璃作为荧光体测量能量密度较高的紫外光束分布，利用可见吸收紫外透射玻璃制成的衰减器测量有严重背景光的紫外光束分布，可以作为实验室的常规测量工具，并有一定的推广价值。
Considering space environment of laser atmospheric communication , the thesis analyses issues of atmosphere turbulance and interference of background light noise during the course of transmission , furthermore , discusses the structure and basic constitute of the laser atmospheric communication system . combining the technical index requirement of the subject , it provides design scheme and circuit of the transmitting and receiving system 论文从激光大气通信的空间环境出发，对光信号传输过程中信道中的大气湍流和背景光噪声干扰问题进行了分析，并在此基础上论述了激光大气通信系统的结构和基本组成，结合课题的技术指标，给出了发射和接收系统的设计方案及其电路实现。
The use of interferometer to detect and analyze laser radiation is well known , but when the intense ratio of the laser radiation to the background natural light radiation is too small , the laser radiation cannot be detected . a novel more sensitive method for detect of wideband weak incident laser in strong background noise is introduced in this paper . the optical unit uses two wedge interferometers and two line array detectors . the incoming light radiation is divided into two beams and through the interferometers 在被动激光侦察告警中，对微弱脉冲激光信号的探测是一个难点。当探测距离相当远或视场内接收的背景光辐射很强时，脉冲激光信号到达探测器的能量很小，会淹没在强大的背景光信号中而探测不到。本论文提出了一种探测微弱脉冲激光信号的方法，可对强烈背景光中的激光威胁信号进行探测和告警，并给出其波长参数。
