基于嵌入式GUI的矿用瓦斯检测仪的研究

针对煤矿瓦斯检测仪检测信息少、检测参数单一、灵活性弱等问题,研究一种基于嵌入式GUI的矿用智能瓦斯检测仪.基于双内核双操作系统,以瓦斯监测为主要功能,采用LS最小二乘拟合与RBF径向基函数数据重构方法提高瓦斯传感器数据近似精度,设计Wince与μC/OS-Ⅱ双内核系统,实现矿用瓦斯智能检测仪的高精度、多信息、高智能化.     

基于ARMv7-M架构的矿用多参数气体检测仪的设计

针对目前矿用气体检测仪只能检测单一气体并且测量气体浓度范围较窄等问题,设计了基于ARMv7-M架构的矿用多参数气体检测仪。此多参数气体检测仪采用STM32处理器以及内外自动切换功能的电源供电模式,将采集到的甲烷、二氧化碳、氧气、一氧化碳的浓度以及环境温度和电源电压值进行数据处理并发送到液晶显示器进行显示。当气体浓度超限或电源电压欠压时检测仪声光报警。经实验测试结果表明该多参数气体检测仪具有自校准功能、精度高、检测范围广、稳定性好、响应速度快和抗干扰能力强等优良性能。     

基于ADuCM360多功能气体检测仪的设计

基于ADuCM360设计的多功能气体检测仪,采用电化学气体传感器对不同组分气体识别并进行浓度检测,用液晶显示模块进行显示,设计测量电路和数据处理电路以及相应的程序,设计出的气体浓度检测仪在实际运用中相对精度高,软件采用模块化编程思想,完成对气体的识别和检测,并对测量数据进行存储和显示。采用低功耗的技术延长该检测仪的电池更换时间和寿命。该多功能气体检测仪运行时功耗低、小巧轻便、功能多,具有良好的实用价值,是一种新型的多功能气体检测仪。     

基于MCS-51的煤矿瓦斯检测仪的设计

为了解决现有矿井瓦斯传感器检测精度低带来的问题,基于红外光谱吸收原理,本文设计了以MS-51单片机为主控制器的高集成度、高灵敏度的瓦斯浓度检测仪。它通过液晶显示器显示现场检测的气体浓度,并根据预先设定好的浓度进行声光报警;能通过串口通讯与上位机进行通讯,将存储的多组数据进行进一步分析。实验表明,该系统的测量误差小于2%,具有很高的测量精度,效果良好。     

瓦斯检测仪中的数据采集与处理

主要描述瓦斯检测仪中前端数据采集模块和数据处理的设计,瓦斯传感器采用半导体传感器MQ214。根据气体的数据特点,对A／D采样后数据进行滤波处理,得到较为精确的测量数据。采集电路分为加热与恢复两种工作状态;数据处理采用MATLAB设计低通椭圆滤波器参数,并在单片机上实现软件滤波,有效滤除了带外噪声。     

气体传感器在多参数气体检测仪中的应用

介绍了多参数气体检测仪的检测原理,对气体传感器在多参数气体检测仪中的应用进行了设计,可实现对O2、CO、CO2、H2S、CH4等5种气体在空气中的含量检测。可控制检测仪进行单一气体的检测,也可对5种气体进行巡回检测。     

石化生产 首重安全

科尔康气体测试装置科尔康的便携式多气体检测仪Tetra:3(简称T3)采用独立式结构,坚固、耐用、轻便,是现场气体测试的理想方案。科尔康新款气体测试装置可向T3传感器通入已知浓度的气体,并确保传感器精确检测。该设备运转快速、使用便捷,可以实现气体检测仪自动识别和气体自动传输。将T3产品插入该设备,T3产助力T3检测仪     

化学工业出版社机械设计图书

红外检测技术王汝琳、王咏涛编著定价:45.00元本书是作者多年从事红外检测技术研究和红外检测仪器设计的总结。全书分别讲述了分子光谱、红外气体传感器、红外瓦斯检测仪、系统设计与信号处理、红外光纤瓦斯检测系统、红外一氧化碳检测、红外一氧化碳检测器设计等方面的理论和相关技术。在实验研究的基础上设计了具有智能功能的红外瓦斯传感器、红外光纤瓦斯检测系统和红外一氧化碳传感器。与现有的各种红外检测仪器相比,设计方案先进合理,功能完善,安全性和可靠性高,具有较高的性能价格比,有很强的实用价值。本书可作为红外检测技术研究和…     

基于积分球算法的新式瓦斯传感器

采用积分球结构的新式吸收气室做为瓦斯气体传感器的核心元件,提出一种新的积分球算法用于瓦斯浓度检测的方法。半导体激光器发射1.65μm激光射入装有一定气体分数瓦斯气体的积分球内,由于瓦斯气体对激光的选择性吸收及积分球壁的衰减作用,激光光强减弱,利用积分球算法算出理想衰减率,进而求出由于瓦斯气体吸收而衰减的光强差,最后计算出瓦斯气体体积分数,为瓦斯检测提供了一种新方法。实验表明:该传感器准确度高、重复性好。     

基于MSP430的便携式四合一气体检测仪

提出一种基于MSP430的便携式四合一气体检测仪的设计方案,给出了系统的硬件和软件设计.该检测仪采用电化学原理来检测氧气、一氧化碳和硫化氢,采用催化燃烧原理来检测甲烷.系统采用了MSP430F5438作为主控芯片,兼顾了检测仪的性能和低功耗.检测仪移植了嵌入式实时操作系统μC/OS-Ⅱ,提高了系统的可靠性和稳定性.利用传感器信号矩阵运算去除气体交叉干扰.通过现场测试,该检测仪测量精确,性能稳定.     

电法地质状况勘探交流激电系统研究

文中研究用直接数字合成技术芯片AD9850构成频率可调交流激电系统.按键设置交流信号频率,随即键盘驱动芯片CH451向单片机发射对应的频率指令.单片机识别频率指令后并行向AD9850送出频率编码,AD9850输出的信号经过滤波放大,零点调节和V-I转换送出激电信号.将该信号源用于交流激发极化探地测量,保证了测量时频率精度和稳定性,而且频程转换快,噪声小.     

甲烷和非甲烷在线色谱的研制及应用

基于空气中甲烷和非甲烷总烃实时监测的需求,研发了采用阀进样和反吹切换技术的在线色谱监测仪。本文介绍了仪器的主要架构和技术特点,实验室性能测试结果和在科研、大气环境监测及化工园区污染物监测领域的应用效果。测试数据和现场应用结果表明该在线色谱仪具有分析时间短（〈3min）,测量精度高、线性范围宽、普适性强等特点,技术指标等于和部分优于国外先进产品,完全满足空气中甲烷和非甲烷总烃在线监测的要求。     

Physics research and technology developments of electron string ion sources

The most recent experimental information on electron string phenomenon, such as two step transition to electron string state, stability of e-strings in condition of electron energy recuperation, are described. The new technology developments of electron string ion sources (ESIS) include pulse injection of gaseous species in e-string and its efficient conversion to ion beams, slow ion extraction, ion-ion cooling of heavy ions with CH(4) coolant, and a progress in the construction of the new Joint Institute for Nuclear Research ESIS with 6 T solenoid are briefly considered.     

Determination of polychlorinated dibenzo-p-dioxins,dibenzofurans, and biphenyls by gas chromatography/mass spectrometry in the negative chemical ionization mode with different reagent gases

Reagent gases that are used in mass spectrometry in the NCI mode for the determination of polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and biphenyls (PCBs) are discussed. Ion-molecule reactions and respective characteristic ions that form while using reagent gases (CH(4), O(2), i-C(4)H(10), NH(3), H(2), He, Ar, Xe, SF(6)) or gas mixtures (CH(4)/O(2), Ar/CH(4), CH(4)/H(2)O, Ar/O(2), i-C(4)H(10)/CH(2)Cl(2)/O(2)) are reviewed. It is shown that only CH(4), O(2), CH(4)/O(2), and CH(4)/N(2)O are widely used and well studied, even though-in the case of these reagent gases-there are contradictions between the publications of various authors. Such reagent gases as NH(3) and He are not well studied, but further investigations of their use for the determination of organochlorine pollutants could be of interest. The possibilities of more sensitive and selective determination of PCDDs, PCDFs, and PCBs are discussed.     

油酸在齿轮切削加工润滑油中的应用研究

以油酸和正丁醇、乙二醇为原料合成的油酸丁酯、油酸乙二醇酯混合物,具有优良的润滑性和良好的耐磨性,添加 在齿轮切削油中,不仅可使工件的加工质量显著提高,同时延长了齿轮刀具的使用寿命。     

基于气体传感器阵列和独立成分分析的易燃气体检测

本文提出一种基于气体传感器阵列和独立成分分析(ICA)的方法来检测常见易燃性气体,例如一氧化碳(CO)和甲烷(CH4).气体传感器阵列由6个商用金属氧化物半导体传感器组成,分别对这两个独立的气源产生响应.通过分析ICA散点图中CO和CH4的信息成分,实现了这两种易燃气体的定性和定量组分分析.仿真结果表明,用ICA对气体传感器阵列测量数据进行处理,可以提高气体识别的准确率和浓度测量的精度.     

Chemical force microscopy of self-assembled monolayers on sputtered gold films patterned by phase separation

Patterned self-assembled monolayers (SAMs) were formed on gold films and observed by friction force microscopy (FFM) and adhesive force mapping with pulsed-force mode atomic force microscopy (PFM-AFM). The substrate gold films were prepared by sputtering gold on flat surfaces of osmium-coated cover glass with surface roughness, Ra, of 0.3 nm. The patterned samples with the CH3 and COOH terminated regions were prepared using the Langmuir-Blodgett (LB) method, partial removal of the LB film by ultrasonication, and SAM formation. The CH3 and COOH terminated regions of the patterned SAMs in air and in water were observed by mapping friction and adhesive forces with FFM and PFM-AFM, respectively, using gold-coated AFM tips chemically modified with a thiol compound terminating in CH3 or COOH. The adhesive forces measured in air increased in the order of CH3/CH3, CH3/COOH (or COOH/CH3) and COOH/COOH, while those in water increased in reverse order. The enormous high adhesive force observed in water for CH3/CH3 was attributed to hydrophobic interaction between the CH3 tip and the CH3 terminated sample surface. With CH3 tip, the lower friction force was observed, however, in water on the CH3 terminated region than on the COOH terminated region. This experimental finding raises a question as to what is the effective normal load in friction measurements in water.     

Acetonitrile (CH3CN) and methyl isocyanide(CH3NC)adsorption on Pt(111) surface: a DFT study

The adsorption of CH3CN and CH3NC on the Pt(111)surface at the 1/4 monolayer(ML)coverage has been carried out at the level of density functional theory for understanding hydrogenation processes of nitriles.The most favored adsorption structure for CH3CN is the C-N bond almost parallel to the surface with the C-N bond interaction with adjacent surface Pt atoms.For CH3NC,the most stable configuration is the CH3NC locates at the face center cubic(fcc)site with the C-atom bonded to three Pt atoms.In addition,the HCN and HNC adsorption has been computed,and the adsorption pattern is nearly similar to the CH3CN and CH3NC,respectively.The adsorbed molecules rehybridize on the surface,becoming non-linear with a bent C-C-N or C-N-C angle.Furthermore,the binding mechanism of these molecules on the Pt(111)surface is also analyzed.     

利用平面激光诱导荧光技术及CH滤镜测量微喷管射流火焰OH及CH基元

微射流火焰形貌观测及火焰中重要基元的准确测量,对利用微尺度火焰燃烧特性研制开发微型燃烧动力系统具有重要意义。本文建立了微喷管射流火焰实验及光学测量系统,对H_2和CH_4微射流火焰进行了实验研究,测量了两种重要基元(CH,OH)的空间分布。首先,探索了相机曝光时间对H_2微射流火焰成像的影响,得到了不同流速下H_2微射流火焰形貌的变化规律。其次,采用平面激光诱导荧光测量技术得到了不同燃料流速下H_2及CH_4微射流火焰中OH基元分布,同时还利用单反相机加CH滤镜通过长时间曝光(30s)的方法获得了CH_4微射流火焰中CH基元的分布。结果表明,火焰图像清晰度随曝光时间增加提高,曝光时间30s时可获得H_2微射流火焰的清晰照片;采用分辨率2 048×2 048的ICCD相机可获得微尺度火焰OH基元分布的清晰图像。微射流火焰形貌及重要基元的实验结果表明相关数值计算方法准确可靠。     

基于P89C669的硬度计核心模块设计

介绍了基于P89C669嵌入式系统的、硬度计核心模块硬件及软件的设计与实现。由大容量嵌入式处理器P89C669和FlashAT24C512构成硬度计核心模块基本系统;由容栅传感器作为主要测量部件;用320×240像素LCD液晶图形显示模块显示信息;用CH341USB数据转换芯片实现数据多路输出;用专业的开关电源,提高电源系统的可靠性。实践证明,该系统的性能稳定、可靠、智能性好。