光源参数的微机自动检测

本文介绍微型计算机自动控制技术在电光源参数自动检测中的应用.利用微型计算机接口技术、光电转换技术,由微机控制步进电机,步进电机带动光栅传动,在可见光范围内逐点扫描得到对应于各波长位置的相对光强度分布值。然后通过比较法确定待测灯相对光谱能量分布,根据色度学原理及CIE关于色度计算方面的有关推荐文件计算出光通量、光效、色坐标、色温和显色指数,从而实现对白炽灯、日光灯、三基色荧光灯等电光源的光通量、光效、色座标、色温、显色指数等光参数的自动检测,解决了人们利用手工测量很难实现对上述光参数进行有效检测的难题。     

高速小目标光电自动检测技术的发展与现状

随着近年来计算机、声、电技术的高速发展，高速小目标光电自动检测技术也有了长足进步，从二十世纪60年代的杆式声坐标靶、光幕靶、光网靶发展到90年代的CCD交汇测量系统，近几年发展到研究TDI－CCD交汇测量系统，该系统克服了CCD交汇测量系统的不足，提高了小目标的捕获几率。     

干涉条纹间距的自动检测

本文介绍采用ＣＣＤ，单片机组成的测量系统自动检测等间距干涉条纹的间距量，系统运用ＦＦＴ方法把干涉条纹的间距量变换为频域量，有效地排降了散斑噪声干扰，方便准确地得到干涉条纹的间距。     

高速小目标光电自动检测技术的发展与现状

随着近年来计算机、声、电技术的高速发展,高速小目标光电自动检测技术也有 了长足进步,从二十世纪 ６０年代的杆式声坐标靶、光幕靶、光网靶发展到９０年代的 ＣＣＤ 交汇测量系统,近几年发展到研究ＴＤＩ－ＣＣＤ交汇测量系统,该系统克服了ＣＣＤ交汇测量 系统的不足,提高了小目标的捕获几率。     

微机电参数测量系统的建立

本文介绍了一种可应用于实验室的微机数据采集与测量系统，以及用该系统开设“电参数测量实验课程，使电磁测量这门课的内容得到充实，实验手段更新换代，满足了新的教学大纲的要求的一些情况。     

基于PXI的光电瞄准设备自动检测系统

光电瞄准自动检测系统是在PXI测试总线技术的基础上,有机地结合计算机技术和虚拟仪器测量技术,研制开发出的新一代检测系统.检测系统采用了PXI总线技术和规范的系统结构框架,通过选取M公司的PXI-1010混合机箱、PXI-8187主控制器、SCXI-1130矩阵开关、SCXI-1167继电器驱动模块、PXI-6509数字I/O、PXI-6229数据采集、PXI-4070数字万用表、PXI-5122数字化仪功能模块以及EXC公司的DAS-429cPCI/Mx、Condor公司基于cPCI的MIL-STD-1553和DDC公司的SB-36200IX模块,并利用LabVIEW开发工具开发出检测系统,而且还解决了PXI模块硬件及驱动程序与被测产品匹配问题,实现了基于PXI虚拟仪器的软面板技术.该检测系统是根椐标准的数据采集--信号分析与处理--输出及显示的结构模型而建立的,实现了光电瞄准系统数据的实时采集、处理和显示.光电瞄准自动检测系统样机实现了产品的自动化检测,具有一定的技术先进性.     

光电耦合器的微机自动测试系统

本文介绍了光电耦合器电参量自动测试的一种微机系统，描述了系统的组成及软件设计。软件设计及Ｃ语言编写，实现自动测试数据，控制检测过程，打印输出结果和存盘记录数据等功能。     

电光源科技发展趋势

本文对电光源发展的现状进行了分析,并对电光源发展趋势及应用前景进行了展望。     

基于恒流源的电阻测量

详细介绍了两种基于恒流源电路的电阻测量方法(即电压表法和电流表法)，分析了电路原理，并给出了实测结果。     

光源色度快速测量方法探讨

为实现光源色度的快速测量,提出了一种基于三基色原理的测量方法。待测光源发出的光依次通过三基色滤光片照射到光电传感器上,光电传感器输出电流信号转化为电压信号,通过V/F转换处理,由单片机系统实现数据采集和处理,得到光源色度的三刺激值和色品坐标,从而实现光源色度的快速测量。     

超辐射发光二极管光源组件内部电场耦合分析

针对超辐射发光二极管(Superluminescent Diode,SLD)光源输出光功率稳定性的需求,用有限元分析方法分析了SLD光源组件内部导体组的分布电容矩阵及电场耦合情况;通过电场耦合模型研究发现温控电路带来的干扰通过分布电容耦合到恒流回路中,影响输出光功率的稳定性;将制冷器接地可减小分布电容,改进恒温电路的驱动方式可减小交流分量的干扰,从而减小电场耦合对输出光功率的影响。     

Light Source Position Measurement Technique Applicable in SOI Technology

Integrated optical sensors make use of a p-n-junction for light intensity detection, typically. Because of the costs, additional optical components are not available in standard integration processes. Therefore, in higher level optical sensors extra optical components are not part of an integration. In this paper a concept for integration is proposed, which especially allows to measure the angles of a far distance light source relative to the surface of the chip and the coordinate system of the integrated structure. The invention makes use of the stack topology and the light opacity of metal layers in the monolithic integration, the light translucency of , and the electrical light sensitivity of diodes. Because of perfect device isolation the implementation can be done most advantageously in SOI CMOS technology. With minor modifications it is applicable in other integration technologies as well. But leakage currents and device mismatching will limit the obtainable performance additionally.     

A Catheter Flow Probe for Measurement of Left Ventricular Source Parameters

A balloon-tip electromagnetic velocity flow probe was used to measure source pressure Pg and zero-load aortic flow Qs in seven mongrel dogs before and after coronary artery ligation, where Qs is the expected aortic flow at zero aortic input impedance and Pg is the expected left ventricular pressure for the open-circuit condition of the equivalent model of the left ventricle. The source parameters Pg and Qs were measured by two types of flow probes (cuff-type and catheter-tip flow probe). The source parameters measured by the cuff-type flow probe are designated by Pg and Qs, and Pgv and Vs are source parameters measured by the catheter probe. The correlation coefficient between the mean values of Pg and Pgv was 0.83 in 47 measurements, and correlation between Q5 and Vs was 0.64. After coronary artery ligation, Qs, Pg, Pgj,, and Vs decreased by 35.9, 19.87, 16.67, and 2.6 percent, respectively. A change of 10 to 30 percent in aortic input resistance could be produced by balloon inflation in two consecutive heartbeats. This paper presents a new application of a catheter flow probe for diagnosis of cardiac pump performance during catheterization procedures.     

机载无线电罗盘垂直天线电参数及测量方法

从机载无线电罗盘垂直天线的基本工作原理出发,结合天线使用过程中的实际情况,以及当今测试技术的发展状态,总结出了一套较为完整的测试方法,并对测试数据的准确性提出了相关建议。工程应用证明,该测试方法合理可行,避免了潜在问题的发生。     

基于偏振光反射多点法测量薄膜参数

依据偏振光反射原理和多角度测量的多点拟合算法,实现了对薄膜材料折射率和厚度的精确测量。将高准直半导体激光入射到薄膜样品与空气分界面上,逐步旋转样品或改变样品表面的入射角,得到待测样品的反射率随入射角变化曲线。在曲线上取不同入射角处所对应的反射率,根据计算公式求解出多组薄膜厚度和折射率。利用已测量的多组反射率与求解出的薄膜参数相应反射率拟合后可确定出薄膜参数最优解。在求出的薄膜参数附近拓展一定范围再次拟合,可求出更精确的薄膜参数。基于此方法测量了SiO2薄膜的折射率和厚度,测量折射率误差不超过0.3%,厚度误差不超过0.07%。     

The Measurement of Heart Rate Variability Spectra with the Help of a Personal Computer

The analysis of fluctuations in heart rate or heart rate variability (HRV) has found applications in, among others, the study of the neural cardiovascular system and ergonomic psychology. In particular, the study of the frequency components of HRV is becoming increasingly important. A method for the computation of HRV spectra directly from the heart beat event series as derived from the electrocardiogram has been developed. Because of the computational efficiency achieved, this method is implemented on a personal computer. Apart from an external QRS detector, a completely stand-alone system is realized. User interaction takes place on a menu card display basis. The system can operate at both real time and up to eightfold increased speed. The resultant spectra are displayed as histograms. Different ways of smoothing and segment averaging are possible.