智能酒精浓度测试仪的电路设计

本设计是以单片机技术为基础,可以对呼吸气体中的酒精浓度进行实时采集、显示和报警,是用酒精浓度传感器对呼吸气体进行感应,采集到的微弱信号经过放大以后,再经过模数转换模块,转换成数字信号以后再由单片机进行分析和计算处理,最后将测量的浓度数据显示在LED数码管上,当超过设定的浓度值时,进行报警。     

基于LCD显示的空气酒精浓度监测仪的设计

空气酒精浓度监测仪是基于单片机的可编程的智能仪器.本课题采用MQ3酒精气敏传感器和单片机系统实现酒精浓度监测仪的设计,并且通过LCD液晶实时显示.并可用键盘设定阈值,并具有超值报警功能.本课题分为两部分:硬件设计部分和软件设计部分.硬件部分为利用MQ3气敏传感器测量空气中酒精浓度,并转换为电压信号经A/D转换后传给单片机系统,由单片机及其外围电路进行信号的处理,显示和浓度值的超阈值声光报警.软件部分用汇编语言进行编程,程序采用模块化设计思想.     

基于单片机设计的酒精气体浓度探测仪

酒精气体浓度探测仪采用MQ-3乙醇气体传感器对空气中的酒精浓度进行检测,利用单片机把检测到的酒精浓度模拟量电压信号转换成数字量,再和预设的酒精浓度阀值进行比较,如果超过阀值由单片机控制三极管驱动蜂鸣器报警,液晶屏显示报警时的酒精浓度;本电路可以由键盘预先设定、调整阀值;本电路能判断吹气是否有效;电路全部采用Protel Dxp 2004制版软件设计;印刷电路板采用双面板设计、双面覆铜方案。     

微机粉尘浓度监测仪

劳动保护和环境监测部门在测量空气中粉尘浓度时通常采用滤膜采样称重法。这种方法需手工操作,费时费工。本文介绍一种以 8031单片机为核心的粉尘浓度监测仪(以下简称粉尘仪)。其特点是功能多,使用方便,可对空气中粉尘的浓度进行自动、连续和准确的测量。一、工作原理图1是粉尘仪的基本结构框图。粉尘仪由微处理器、显示器、键盘、A/D转换电路、光电传感器、信号放大电路和打印机组成。     

基于光散射的粉尘浓度测量的研究

文章介绍了一种智能激光粉尘测试系统的软硬件结构设计,详细给出了系统光学传感器的原理结构及使用方法,传感器非线性信号处理以及系统的数字滤波方案。最后系统测量了苏州大学物理实验中心外距地面约2米的空气中的粉尘相对质量浓度,连续测量36天,并与国家环保总局苏州地区每天预报的空气污染指数转换后的可吸入颗粒物(PM10)浓度值相比较,得出对应关系,运用MATLAB拟和直线对系统进行标定。     

基于单片机的粉尘监控报警系统研究

近些年粉尘爆炸事故频发,面粉生产车间首当其冲,考虑到员工的安全,文章设计基于单片机的粉尘实时监控报警系统,减少因粉尘爆炸事故造成的人员伤亡和财产损失,提高生产安全。根据STC89C51单片机的功能结构特点以及粉尘传感器的特点,通过粉尘传感器实时检测厂房粉尘浓度,利用蓝牙模块,可以将检测数据发送到上位机查看,当检测浓度值达到预警值时,开启声光报警,同时启动除尘装置,从而保障生产车间的安全。     

粉尘测量报警仪的设计方法

本文首先分析了空气污染的危害,说明粉尘测试的必要性,然后介绍了粉尘测试的应用和发展概况,比较了几种常用的空气粉尘测试方法,在此基础上,阐述了以AT89C52单片机为核心,采用光散射法测定粉尘浓度的自动检测系统。阐述了光纤传感器总体特点,及其测量原理及工作过程,解决了测量粉尘的浓度不能实现实时在线监测问题,打破了传统的取样分析方法,达到快捷、准确、便利,而且具有体积小、重量轻的特点。     

一种新型车载酒精浓度测量仪的设计

采用STC89C52单片机为核心,选用酒精传感器MQ3设计了一种车载酒精浓度测量仪.系统包括液晶显示模块、数据采集模块、A/D转换模块、超标报警模块、按键设置模块和数据存储模块等.利用MQ3输出电压值与酒精浓度值的线性关系来测量酒精浓度值,并对测量结果进行误差分析.设计的车载酒精浓度测量仪能较好地测量驾驶者体内的酒精浓度值,以便提醒驾驶者遵守交通规则,勿酒驾或醉驾,避免交通事故的发生.     

纺织厂粉尘净化效率及粒径分布的实验研究

纺织厂在生产运作过程中产生大量的粉尘,这些种类不同的粉尘的粒径差别很大,对纺织厂的生产和人体的健康产生很大影响。对西安某纺织厂细纱车间粉尘浓度进行分析,细纱机工作区的空气粉尘浓度值几乎都在2.0 mg/m3以下,喷水室对粉尘的总净化效率为75%。运用专业粉尘颗粒物分析软件Ima ge-Pro Plus6.0研究粉尘粒径分布规律,得到含尘气流在经过喷水室前后粉尘数量分散度的变化;粒径>15μm的大颗粒粉尘的分级效率达到了83.5%,而粒径≤5μm的微粒分级效率为30.4%,说明喷水室对大颗粒粉尘除尘效果较好,加强对微细颗粒的去除是下一步研究的重点。     

基于51单片机的酒精浓度测试仪设计

针对驾驶员酒后驾车,量刑标准不明确的问题。本文利用MQ-3酒精浓度传感器能很好的解决该问题。MQ-3乙醇气体传感器以驾驶员呼出的气体为采集对象,输出随乙醇浓度变化的电压信号,该电压信号经ADC0832转换,送入STC89C52单片机系统,通过AT24C02与设定的醉酒阈值进行比较,并在LCD1602液晶上显示酒精浓度值,当酒精浓度超过设定值时,通过单片机驱动蜂鸣器进行报警。从而为交警检测驾驶员是否酒后驾车提供了可靠的依据。     

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.     

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.     

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.     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.