机场助航灯光施工研究

文章对机场助航灯光的技术进行探讨。介绍民用机场助航灯的特点、施工工艺以及调试的过程、机场导航灯光、控制系统、通讯系统、接地系统、电源系统等。最后提出在类似的工程里,需要注意的问题,希望可以提高机场助航灯光施工的质量给同行提供相关参考经验。     

《机场移动式助航灯光参数测试仪检测方案》通过评审

本刊讯近日,国家光电子信息产品质量监督检验中心编制的《机场移动式助航灯光参数测试仪检测方案》通过评审,该方案填补了该领域国内空白。目前,国内机场助航灯光维修检测均通过目测方式进行,缺乏客观判定标准。而国外移动式机场助航灯光参数测试仪欲进入中国市场,必须通     

基于单片机STC12C5A60S2的自动测控LED节能照明系统

阐述一种基于单片机STC12C5A60S2自动测控LED节能照明系统的设计方案。该系统能够对LED灯的亮度进行自动调控,环境光强减弱时单片机自动提高LED的发光强度,环境光强变强时大年纪自动减弱LED灯的发光强度,因此达到减少能源消耗,实现环保功能。此外,本系统还具有光强、温度、红外等传感器来实现LED灯的开关,通过前置的过压、过流保护电路,保证电路系统正常工作和节能效率。LCD液晶显示电路输出外界的当前参数值,因此更加人性化,实现人机交互。该系统在很多基础设施有广阔的应用。     

自动输液监护系统设计

针对目前医疗输液监护过程中人工监控的缺陷,提出了一种基于单片机和蓝牙无线通信技术的自动监护系统.系统采用主、从站分布式结构,从站以单片机为核心构成单片机系统对输液仪器进行设定、检测和显示,主站以PC机为核心对输液过程进行远程监控.主、从站之间通过蓝牙通信,医护人员可以及时掌握输液信息进行监控.     

基于Lon Works技术的交通灯智能控制系统研究

介绍一种基于LonWorks总线技术的分布式区域交通信号灯控制系统。系统采用STC12C5410AD单片机作为核心控制器,自动进行车流量检测,以此单片机合理控制交通灯的停、行时间。分布式测控系统中监控主机通过FT3120智能收发器进行通信,实现多路口交通灯的分布式控制。     

某型水下照明灯智能控制平台的设计与实现

针对某水下成像过程中水下照明灯的控制问题,设计了可视化软件控制平台.该平台基于VC环境下的串口编程技术,通过多串口卡与单片机之间数据包传递的方式,实现了PC机同MCS51单片机通讯,从而达到了对灯亮度自动调节的目的.实际应用表明,该软件平台工作稳定、可靠,可实时根据水下成像照度要求对水下照叽灯进行智能控制.     

工业雷管自动装填线分布式控制系统

介绍了一种工业雷管自动装填线分布式控制系统,该系统采用RS485总线将上位计算机与各个工艺控制模块连接起来.上位计算机采用以MCGS软件包开发的监控软件,实现对各装填工艺单元集中监控、信息处理、雷管类型选择等操作,各个工艺控制模块均采用可编程控制器进行控制.     

混合动力汽车快速控制原型系统仿真平台开发

为加快混合动力汽车控制策略的开发进度,缩短产品开发周期,设计与开发了基于飞思卡尔MC9S12DG256控制器、驾驶员模拟器、控制器自动代码生成编译工具包及Freemaster实时数据监测软件构成的混合动力汽车控制策略快速控制原型系统半实物仿真平台,将底层驱动与上层控制策略模型一键下载到MC9S12DG256控制器,实现模型到代码的自动下载,并能与AVL CRUISE中车辆信息进行实时的串口通信。针对一款并联式混合动力客车进行仿真实验,结果能较好地模拟实车特性,验证了该仿真平台的有效性,其开发成本低廉,易在高校中推广。     

智能交通灯控制系统

交通灯控制器是智能交通系统中重要的组成部分,设计中选用STC89C52作为交通灯控制器的处理芯片,由单片机的P1口给出控制信号控制交通灯运行。利用红外对管,充当了流量计数器,实时监控路口的车流状况,自动调节系统时间,达到更加高效的车流控制和路口通行效果,通过无线收发模块实现特种车辆的特殊准许通过。     

开发温度控制系统

模拟控制器以单片机为核心,结合液晶(LCD)显示、键盘输入和必要的外围电路,完成锅炉加热的自动控制。采用串行通讯方式,可以使PC机控制多个控制器,从而使系统扩展为多点加热控制系统。该系统既可以使用PC机进行远程控制,亦可通过键盘对控制器进行现场控制。具有可扩展性好、控制方便的特点。     

基于激光测距的飞机着陆滑行灯靶板自动化校准系统

飞机着陆滑行灯的传统灯光校靶方法存在测量误差大、操作效率低、可靠性差的缺陷.针对此问题,本文基于激光准直和激光测距原理,研究并提出了一套飞机着陆滑行灯自动化校靶系统,该系统利用激光仪模拟滑行灯指示进行光路准直调整,通过激光测距实现滑行灯空间位置的调整,并采用电子靶板实现自动化调整,进而实现着陆滑行灯的自动化校准.开展实...     

基于PLC的校园照明智能控制系统设计

大学的电能消耗中,照明用电占了绝大部分,其中道路和景观照明容量大,工作时间长,且常采用手动控制方法,造成了浪费.为此,针对学生的活动规律,在新校区道路和景观照明设计时,采用了PLC智能控制.学生公寓熄灯之前一段时间,道路照明和景观灯全部开启;之后的时间,适当降低道路照度要求,一部分景观灯关闭;另外,寒暑假期间,也采用了不同的时段控制方式.该照明智能控制系统运行以来,通过测算,每年节约电能达25%以上,灯具的使用寿命也有所提高,系统稳定可靠,完全满足了学校的照明要求,达到了预想的结果.     

Effectiveness of maritime safety control in different navigation zones using a spatial sequential DEA model: Yangtze River case

This paper aims to analyze the effectiveness of maritime safety control from the perspective of safety level along the Yangtze River with special considerations for navigational environments. The influencing variables of maritime safety are reviewed, including ship condition, maritime regulatory system, human reliability and navigational environment. Because the former three variables are generally assumed to be of the same level of safety, this paper focuses on studying the impact of navigational environments on the level of safety in different waterways. An improved data envelopment analysis (DEA) model is proposed by treating the navigational environment factors as inputs and ship accident data as outputs. Moreover, because the traditional DEA model cannot provide an overall ranking of different decision making units (DMUs), the spatial sequential frontiers and grey relational analysis are incorporated into the DEA model to facilitate a refined assessment. Based on the empirical study results, the proposed model is able to solve the problem of information missing in the prior models and evaluate the level of safety with a better accuracy. The results of the proposed DEA model are further compared with an evidential reasoning (ER) method, which has been widely used for level of safety evaluations. A sensitivity analysis is also conducted to better understand the relationship between the variation of navigational environments and level of safety. The sensitivity analysis shows that the level of safety varies in terms of traffic flow. It indicates that appropriate traffic control measures should be adopted for different waterways to improve their safety. This paper presents a practical method of conducting maritime level of safety assessments under dynamic navigational environment.     

Decoupled stochastic parallel gradient descent optimization for adaptive optics: integrated approach for wave-front sensor information fusion

A new adaptive wave-front control technique and system architectures that offer fast adaptation convergence even for high-resolution adaptive optics is described. This technique is referred to as decoupled stochastic parallel gradient descent (D-SPGD). D-SPGD is based on stochastic parallel gradient descent optimization of performance metrics that depend on wave-front sensor data. The fast convergence rate is achieved through partial decoupling of the adaptive system's control channels by incorporating spatially distributed information from a wave-front sensor into the model-free optimization technique. D-SPGD wave-front phase control can be applied to a general class of adaptive optical systems. The efficiency of this approach is analyzed numerically by considering compensation of atmospheric-turbulence-induced phase distortions with use of both low-resolution (127 control channels) and high-resolution (256 x 256 control channels) adaptive systems. Results demonstrate that phase distortion compensation can be achieved during only 10-20 iterations. The efficiency of adaptive wave-front correction with D-SPGD is practically independent of system resolution.     

基于MSP430单片机的温湿度监测与报警系统设计

基于越来越多的场合需要及时监测环境温湿度的需求,给出了基于MSP430单片机的温湿度监测与报警系统的设计方案,系统以MSP430单片机为核心,采用SHT11温湿度传感器芯片,对温湿度监测与报警系统的软硬件进行了设计。结果表明：该系统具有温湿度采集和实时显示及超过设置上、下限温湿度自动报警等功能;该系统还具有成本低、环境采集误差小、作业效率高等特点,具有广阔的应用前景。     

残留农药的光学检测技术和去噪处理

根据残留农药受到紫外光激发能够发出荧光的机理,研究了一种用于测量残留农药浓度的荧光光纤测量系统.该系统采用脉冲氙灯作为激发光源,光纤探测并传输荧光,电荷耦合器(CCD)作为荧光检测系统的光电转换器件.由于荧光是微弱信号,系统采用微弱信号处理电路对CCD输出信号进行了处理,并且采用相关双采样技术有效地抑制了CCD输出噪声的干扰.用该系统对吡虫啉溶液进行荧光分析,实现了对吡虫啉的快速测定,在5～100μg/L范围内,荧光强度和浓度基本呈线性关系,线性相关系数为0.9959.     

Diffractive optical elements designed for highly precise far-field generation in the presence of artifacts typical for pixelated spatial light modulators

Diffractive optical elements (DOEs) realized by spatial light modulators (SLMs) often have features that distinguish them from most conventional, static DOEs: strong coupling between phase and amplitude modulation, a modulation versus steering parameter characteristic that may not be precisely known (and may vary with, e.g., temperature), and deadspace effects and interpixel cross talk. For an optimal function of the DOE, e.g. as a multiple-beam splitter, the DOE design must account for these artifacts. We present an iterative design method in which the optimal setting of each SLM pixel is carefully chosen by considering the SLM artifacts and the design targets. For instance, the deadspace-interpixel effects are modeled by dividing the pixel to be optimized, and its nearest neighbors, into a number of subareas, each with its unique response and far-field contribution. Besides the customary intensity control, the design targets can also include phase control of the optical field in one or more of the beams in the beam splitter. We show how this can be used to cancel a strong unwanted zeroth-order beam, which results from using a slightly incorrect modulation characteristic for the SLM, by purposely sending a beam in the same direction but with the opposite phase. All the designs have been implemented on the 256 x 256 central pixels of a reflective liquid crystal on silicon SLM with a selected input polarization state and a direction of transmission axis of the output polarizer such that for the available different pixel settings a phase modulation of ~2pi rad could be obtained, accompanied by an intensity modulation depth as high as >95%.     

机场噪声评价量分析与比较

分析世界主要国家和地区使用的机场噪声评价量的基本原理、计算方法及控制标准,并基于某大型繁忙机场实际噪声监测数据,通过实验分析论证各机场噪声评价量的共性和差异,指出现有机场噪声评价量的不完备和需改善之处。     

基于WebSocket 的印刷包装机械远程监控方法的研究

对比传统B/ S 模式的远程监控技术,提出了一种基于HTML5 WebSocket 协议的印刷包装机械远程监控方法。基于WebSocket 协议,使用MFC、HTML5 和JavaScript 技术编码实现了远程监控系统。在多种操作系统平台下进行了远程监控实验,通过该系统实现了三菱PLC 的远程监视与控制。实验结果证明了该方法的可行性。     

General solution of undersampling frequency conversion and its optimization for parallel photodisplacement imaging

A general solution of undersampling frequency conversion and its optimization for parallel photodisplacement imaging is presented. Phase-modulated heterodyne interference light generated by a linear region of periodic displacement is captured by a charge-coupled device image sensor, in which the interference light is sampled at a sampling rate lower than the Nyquist frequency. The frequencies of the components of the light, such as the sideband and carrier (which include photodisplacement and topography information, respectively), are downconverted and sampled simultaneously based on the integration and sampling effects of the sensor. A general solution of frequency and amplitude in this downconversion is derived by Fourier analysis of the sampling procedure. The optimal frequency condition for the heterodyne beat signal, modulation signal, and sensor gate pulse is derived such that undesirable components are eliminated and each information component is converted into an orthogonal function, allowing each to be discretely reproduced from the Fourier coefficients. The optimal frequency parameters that maximize the sideband-to-carrier amplitude ratio are determined, theoretically demonstrating its high selectivity over 80 dB. Preliminary experiments demonstrate that this technique is capable of simultaneous imaging of reflectivity, topography, and photodisplacement for the detection of subsurface lattice defects at a speed corresponding to an acquisition time of only 0.26 s per 256 x 256 pixel area.