基于LabWindows/CVI的车辆违章检测系统的分析与设计

本文主要是基于LabWindows/CVI的车辆位置违章检测系统.应用地感线圈检测技术检测车辆是否有位置违章,然后通过USB-4711A-AE数据采集卡采集车辆违章的电信号,用来检测车辆是否违章,如果有车辆违章则在LabWindows/CVI采集界面上就会有波形出现.这种检测方法只采集违章信号,在一定程度上,减少了人工的工作压力.经过实验仿真表明,该系统能够实现车辆违章检测数据的采集.     

基于光纤Bragg光栅传感器的车辆载重动态检测系统的初步开发

我国公路建设近年来取得了举世瞩目的成就,但是车辆超载现象对于道路和桥梁安全造成严重威胁,也给交通安全埋下隐患.目前,国内车辆称重系统多为人工静态检测,检测效率低,漏检现象严重.研究开发高效、精准、性能优良的车辆载重检测系统,对改善这一现状有重要意义.本文基于对光纤Bragg光栅传感器的分析与研究,构建了一套车辆载重动态检测系统,车辆无需停车即可完成检测.     

基于激光与视觉的车辆防撞技术的研究

提出了一种基于视觉与激光测距相结合的车辆防撞技术.首先采用改进的Hough变换对车道标志线进行检测与提取,根据车辆底部的阴影特征搜寻车辆可能出现的位置;利用边缘检测排除非车辆区域;然后结合车辆在图像中的宽度,利用激光测距传感器对前方车辆动态扫描,计算出两车的车距和相对速度;最后用卡尔曼滤波算法连续跟踪检测到的车辆;实验表明:该方法能够实时有效地检测前方车辆,在高精度汽车防撞系统中具有一定的意义.     

基于改进SSD算法的限位器检测方法

自动泊车系统已经成为高级辅助驾驶系统(ADAS)中的一项重要功能,车辆在泊车过程中时常会出现泊车不到位、与相邻车位中的车辆发生剐蹭等事故.为提升自动泊车的精准性,文章提出了一种实时检测限位器的改进算法SSD-L,通过定位限位器的位置,对车辆的泊车位置进行修正.该方法对原先的SSD网络结构进行精简和改进,并使用卡尔曼滤波...     

汽车衡远红外定位检测系统

目前，我国大部分计量工作都是由电子汽车衡进行的，在汽车衡检斤计量过程中，存在车辆没有完全驶入称重台面而进行称重计量的行为，这属于一种计量作弊行为，给企业造成了很大的经济损失和信誉影响。我们可以利用技术手段杜绝此类现象的发生，远红外定位检测系统，解决了这一问题，保证了计量工作的可靠性及准确性。本文就远红外定位检测系统作一初步介绍。     

超声车辆检测的状态机算法

车辆检测现在主要应用到的有红外、地磁、视频和超声波等几种技术,它们各自都具有优缺点.文中分析并设计了一种基于HY-SRF05超声波模块的车辆检测算法：状态机检测算法.该算法能对检测车辆的阀值进行动态的更新,达到准确高效的检测效果.同时,该算法也适用于中、大型停车场的车辆诱导系统和公路上交通车流量的检测.     

红外测量在车流量监测中的应用

介绍了基于红外传感器的车流量监测系统的总体方案以及软硬件设计.说明了红外传感器的选择以及菲涅尔透镜应用.红外传感器经过两级放大后,与窗口比较器进行比较产生脉冲进入单片机电路.通过对脉冲序列的分析和判断,得到通过车辆数.该系统采用红外传感器检测是否有车辆通过,可以将探头放置在公路的适当位置,车辆通过时会引起传感器输出的变化从而监测道路情况,测量该路段的车流量并将测量结果显示在屏幕上.文中说明了道路测试结果,并给出测试波形.阐述了车辆的计数流程图.并进行了车流量监测系统显示程序设计.本系统的软件设计部分用C51编写,设计程序实现了液晶屏显示等功能,C语言与汇编语言相比其可读性更强,使用也更简洁.在车流量监测系统中,基于红外传感器能够较好地实现了车流量的显示.     

基于多模态数据的车辆行人检测

针对图像作为数据源在车辆行人检测任务中无法确定车辆行人空间位置、预测框不准确的问题,提出一种基于多模态数据的车辆行人检测方法.对点云预处理后获得的点云图像投影;通过卷积神经网络检测图像中的车辆行人;利用该方法提出的匹配公式和基于MLP的多模态联合评价方法,对点云和图像处理结果进行融合,实验结果表明,该方法可以获得准确的车辆行人空间位置,88.5％的目标位置误差在1 m以内;融合检测框相比于YOLOv3和DeepLabv3分别提升2.2％和3.3％;方法具有可推广性.     

数字指示秤作弊检测系统的设计

本系统将嵌入式软件自动化测试技术应用于计量行业中数字指示秤作弊检测领域,实现了数字指示秤作弊检测中自动载荷、自动按键、读数捕获、数值判断、动作反馈、结果记录的全流程自动化操作。本文阐述了该系统的设计方案及上层控制软件的设计。     

基于线阵CCD的交通信息采集和检测系统设计与实现

设计并实现了一种基于线阵CCD的交通信息采集和检测系统.该系统利用线阵CCD连续快速记录通过检测断面的车辆的线阵图像,并从该序列线阵图像中获取车牌号码、车辆存在、车辆速度、车辆类型、交通占有率和流量等各种交通参数,并通过TCP/IP协议向监控中心实时传递需要的数据信息.与传统的视频检测系统相比,该系统具有实时性高,检测准确,功能丰富等优点,在实际工程中使用效果良好.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.