车载式地照器监测系统标定靶板的设计及其误差分析

车载式地照器监测系统标定靶板是用太阳光做光源 ,模拟 1 0 6μm激光光斑 ,用于检测《车载式地照器监测系统》对靶板上激光光斑能量重心位置的测量精度 ,以完成《车载式地照器监测系统》的验收工作。     

基于FPGA的图像数据融合技术研究

针对激光器照射动态靶板测试时,由于运动靶板带来的光斑畸变问题,提出了一种基于FPGA(FieldProgrammable Gate Array)的图像数据融合的设计方法.文中将数字CCD(Charge Coupled Device)相机采集到的激光光斑图像信息、BD2(BeiDou2Navigation Satellite System)/GPS(Global Position System)授时模块提供的精确的时间数据信息以及跟踪转台提供的方位、俯仰的角位置信息,利用卡尔曼加权融合算法,在FPGA内部实现数据信息的融合,使得在一幅光斑图像上同时体现多源信息.结果表明:测试完成后通过判读带有融合了角位置以及时间信息的图像数据来对光斑图像进行畸变校正,减小了畸变误差对系统的影响,大大提高了光斑重心检测精度.     

提高随机位相板能量利用率的研究

首次提出了菱形形位相元结构的随机位相板，用衍射理论分析了经这种随机位相板变换后的激光在远场的光斑特性。结果表明其能量利用率高于其它随机位相板用面阵ＣＣＤ记录的远场光斑，经计算机处理后得到的光斑包络与数值计算结果一致。     

串轴式靶板器研制与应用

主要讲述了串轴式靶板器的设计、应用特点,及其在火力发电厂冲管临时系统中的应用效果,并进一步提出了一些改进设想,为今后火力发电厂冲管临时系统中靶板器的设计、应用提供借鉴。     

一种基于亮度阈值的激光光斑中心定位算法

激光光斑图像的光斑中心定位是激光位移检测中的关键技术之一.为提高桥梁挠度测量系统的实时性能,本文针对测量中激光光斑图像的特点,提出了一种确定光斑中心位置的方法.利用激光图像中光斑区域与其它区域亮度差别较大的特点,确定亮度阈值并将光斑图像进行二值化处理,得到一幅仅有激光光斑的图像,根据圆上平行弦的中点连线通过圆心的原理,通过求弦的中点确定圆心.本方法原理简单,计算量小,计算速度快,能够满足测量系统的实时性要求,已在测量实验中取得了较好的效果.     

测量冲击压缩下靶板表面漫反射率的光电系统

本文给出了一种实验研究冲击压缩下靶板表面漫反射率的光电技术 ,该技术使用激光作为外光源照射随机粗糙的靶板表面 ,同时测量不同立体张角的漫反射激光功率 ,进而得到表面反射率。测量系统中 ,用偏振分束器将激光与热辐射进行偏振分离 ,再将两束振动方向相互垂直的偏振光相减 ,完全消除了热辐射对信号的影响。已用该技术实验研究了钨靶在冲击压缩下的表面反射率 ,获得了较好的实验结果。文中对实验结果进行了简单的分析     

利用二次成像法实现外场激光光斑测量

本文介绍了二次成象法测量光斑的原理,对外场测量光斑的方法.试验结果证明二次成象法巧妙地结合了两种成像器件的优点,既提高了测量系统对激光的响应灵敏度,又可利用异步CCD有效抑制太阳背景,增加系统的作用距离.该方法是解决外场激光光斑测量的一种有效手段.     

激光用于LCD板ITO膜修复的研究

对激光修复LCD板ITO膜的过程及影响因素进行了理论分析和计算。设计并加工出一套激光聚焦系统，由一个用于扩束和压缩发散角的倒置开普勒望运镜和聚焦透镜组成，其聚焦光斑为15μm。优化了调Q基模Nd：YAG激光器的参数，并用其进行了实验研究。结果表明，能修复各种不同厚度的ITO膜，打的孔小于20μm，位置漂移量小于3μm。     

激光三角扫描法检测微刻槽

本文介绍一种激光三角扫描法微刻槽检测系统。该系统以激光三角法为基础 ,采用激光光斑能量细分方法 ,有效地解决了激光三角法由于光斑直径过大而引起的横向分辨力不足的问题 ,并容易做到微型化 ,适用对任意非镜面材料表面划痕的在线测量     

激光制导武器目标光斑大小半实物仿真研究

针对激光制导武器半实物仿真中的光斑大小仿真需求,通过对激光导引头的工作原理进行分析,本文建立了实验室环境下的目标光斑位置和大小变化的仿真模型;根据相似性原理,提出了采用光学扩束系统来控制光斑大小的变化,从而模拟真实环境下激光导引头所敏感到的目标光斑大小实时变化;基于模型进行了激光半主动炸弹光斑大小仿真实验.实验结果表明,目标光斑大小仿真模型是正确的,仿真方法是切实可行的,满足了激光制导武器半实物仿真的要求.     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

Assessment of intakes of mixtures of radionuclides

Australia has several uranium mines and a large number of mineral sand mines, with associated processing facilities. Exposures resulting from these mining and processing operations usually involve intakes of mixtures of radionuclides. This work describes the development of a suite of first order, linear compartment models, based on the ICRP Publication 66 respiratory tract model, and an analytical solution to the decay equations, for assessing the consequences of such intakes. The computer programs based on these models directly compute excretion, organ retention and organ and whole-body doses for intakes of either single radionuclides or any mixture of radionuclides belonging to the same radioactive decay chain. The intake can be via inhalation, ingestion or injection, and can be acute, chronic or of limited duration. The starting concentration and degree of secular (dis)equilibrium can be specified for each radionuclide. No assumptions need to be made about the relative magnitudes of the radioactive half-lives of the different nuclides.     

卧式金属罐容量的测量结果不确定度

本文根据多年的实践检定经验 ,参照JJF1 0 59- 1 999《测量不确定度评定与表示》以及《测量不确定度表达 1 0讲》 ,对卧式金属罐容量的测量结果不确定度进行了评定。     

盐酸浓度不确定度的评估

通过对盐酸浓度标定的过程分析，找出影响结果的各个分量，进行不确定度的评定，按照计量技术规范给出标准的表示法。     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.     

空压机轴承箱蜗壳温度探头油封改造

由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。