数字式溶解氧分析仪的研制

设计了一种基于极谱法的数字式微量溶解氧分析仪(HK-258型),介绍了溶解氧传感器的工作原理和结构.仪器以单片机为核心进行控制和信号处理,抗干扰能力强,性能可靠稳定.与瑞士Orbisphere公司的溶解氧记录仪作了对比测试.仪器测量精度达到μg/L级.     

Retarding field analyzer for ion energy distribution measurements at a radio-frequency biased electrode

A retarding field energy analyzer designed to measure ion energy distributions impacting a radio-frequency biased electrode in a plasma discharge is examined. The analyzer is compact so that the need for differential pumping is avoided. The analyzer is designed to sit on the electrode surface, in place of the substrate, and the signal cables are fed out through the reactor side port. This prevents the need for modifications to the rf electrode--as is normally the case for analyzers built into such electrodes. The capabilities of the analyzer are demonstrated through experiments with various electrode bias conditions in an inductively coupled plasma reactor. The electrode is initially grounded and the measured distributions are validated with the Langmuir probe measurements of the plasma potential. Ion energy distributions are then given for various rf bias voltage levels, discharge pressures, rf bias frequencies--500 kHz to 30 MHz, and rf bias waveforms--sinusoidal, square, and dual frequency.     

矢量网络分析仪8项误差模型和校正理论

对矢量网络分析仪S-参量误差模型的建立及校正理论进行了研究.给出了八项误差模型建立的基本理论.并根据此理论设计了一套利用标准元件对矢量网络分析仪S-参量测量进行校正的方法.简化了校正计算.     

基于多元非线性拟合方法的碳硫分析仪检测系统

为了满足对金属材料中碳硫元素含量的高精度和高灵敏度分析的需求,设计了高频红外碳硫分析仪.阐述了高频红外碳硫分析仪的结构和工作原理,并详细论述了检测系统的结构设计.通过采用高灵敏度红外热释电传感器、超窄带滤光片、表面镀金的特征光锥等设计,并将光锥与灵敏元真空封装在一起,减少了干扰气体成分的影响,提高了碳硫分析仪的检测灵敏...     

用于半导体激光器噪声测量的虚拟频谱分析仪

本文介绍了基于LabVIEW语言的虚拟频谱分析仪的设计及功能实现。该虚拟频谱分析仪取代了传统的用于半导体激光器噪声测量的频谱分析仪,大大节约了测量成本,可以实现包括信号时域波形显示,功率谱分析、频率响应分析、互功率谱分析及存储打印等功能。     

基于ARM的煤质工业分析仪的设计

设计一种基于ARM的全自动测量煤质的工业分析仪。该分析仪采用热重分析原理自动测量煤中水分、灰分和挥发分的质量分数。仪器既可以单独工作又可以通过RS485总线接入上位PC机系统，通讯协议采用ModBus_RTU通信规约，有利于实验室煤质工业分析仪构成总线式自动测量系统，方便仪器的拓扑扩展。     

密闭式油品酸值自动测定仪研制

根据油品酸值测定的特点,设计并定制了一种密闭式油品酸值自动测定仪,测量采用电位滴定法,由主机、样品交换器及控制软件构成。自主研制与消化吸收相结合,主机包含精密小体积加液与计量,负责数据传递与处理;样品交换器可同时盛放12个样品杯,按要求自动去盖加盖;滴定过程由软件控制,按照GB/T 7304方法规范执行程序,测定全过程密闭运行,测定结果相对偏差不大于2.8%,该方法与GB/T 7304方法手工结果具有较好的一致性。     

一种野外近红外油料质量分析仪的研制

为满足野外油料质量快速分析需要,本文研制一种基于电荷耦合器件(CCD)阵列检测的适于石油轻质燃料分析的近红外光谱仪,并对该仪器的性能进行评价。该仪器体积小,重量轻,满足手提式需求;采用密封式电路和光学系统,带有车载固定夹具。该仪器具有分析速度快、测量结果重现性好、环境适应性强、操作界面友好、分析数据库适用面广、无废液污染等特点,适用于野外环境条件下作业。     

基于紫外荧光法的大气SO2气体浓度分析仪

本文详细介绍了紫外荧光法测量二氧化硫(SO2)浓度的原理和分析仪的电路系统设计.阐述了该分析仪硬件电路结构和软件系统结构与流程.分别实现了高温与制冷等温控电路对反应室、转换室和光电倍增管的温度控制;采用基于复杂可编程逻辑器件实现了对紫外荧光信号的信号拾取电路;实现了串行口与USB桥接电路;实现了并行口对GPIB接口电路模拟通信.在性能实验中,表明该分析仪样机能对浓度为0～143 mg/m3的SO2保持线性的和稳定的检测.与国外同类仪器的48 h连续工作对比情况表明,该分析仪具有检测灵敏度高、实时检测以及稳定性好等特点,达到了实际应用的水平.     

Note: The intermodulation lockin analyzer

Nonlinear systems can be probed by driving them with two or more pure tones while measuring the intermodulation products of the drive tones in the response. We describe a digital lockin analyzer which is designed explicitly for this purpose. The analyzer is implemented on a field-programmable gate array, providing speed in analysis, real-time feedback, and stability in operation. The use of the analyzer is demonstrated for intermodulation atomic force microscopy. A generalization of the intermodulation spectral technique to arbitrary drive waveforms is discussed.     

分析温室气体及CO2碳同位素比值的傅里叶变换红外光谱仪

改进了傅里叶变换红外分析仪（FTIR）的硬件设计以实现温室气体及CO₂碳同位素比值的多组分、高精度、连续自动测量。首先,对FTIR分析仪测量系统进行了设计和理论分析,引入了温度和压力监控系统以及全密封气路干燥系统。然后,讨论了光谱的定量分析过程。最后,设计了标准气体对比测量实验。实验结果表明：分析仪测量CH₄,CO,CO₂和δ¹³CO₂值的标准偏差分别为0.01×10^-6,0.011×10^-6,0.239×10^-6和0.572‰,与常规FTIR测量系统相比,其检测的标准不确定度分别提高了6.3,8.45,10.54和14.73倍,其系统误差分别提高了2.88,1.93,4.67和4.66倍;对比分析仪与同位素质谱仪对δ¹³CO₂值的测量结果,标准偏差分别为0.572‰和0.171‰,二者测量的标准不确定度相近。所设计的温室气体及CO₂碳同位素比值FTIR分析仪能够满足多组分、高精度、连续自动测量的需要。     

中红外傅里叶气体分析软件系统的设计

中红外傅里叶多组分气体分析仪已逐渐成为环境污染检测,工业生产过程监控的有力工具。文中基于自行研制的PFTS型中红外傅里叶多组分气体分析仪,介绍了相应的中红外傅里叶多组分气体分析软件系统构成和设计方法,并重点描述了软件系统的主要模块:光谱连续采集,光谱识别与具基线自补偿能力的多组分浓度分析方法的实现原理和具体算法。现提出的设计方法对光谱研究人员开发产品化的多组分气体分析软件有一定的借鉴之处。     

Nanographite analyzer of laser polarization

An optical analyzer of laser polarization has been designed and manufactured. The principle of operation of this analyzer is based on the recording of the polarization-dependent surface photocurrents in nanographite films. The analyzer does not contain additional optical elements and consists of a cylindrical bushing with a gauge of its angular position, a nanographite film grown on a silicon substrate, two parallel measurement electrodes placed on the film surface, and an electrical measuring instrument. The nanographite film is placed on the bushing obliquely so that the measuring electrodes are parallel to the axial cross section of the bushing, which is oriented perpendicular to the film tilt plane. The analyzer can operate in the wavelength range from 266 to 4000 nm.     

呼气氢测试仪的研制与临床应用

报道了一种国内首创的用于氢呼气诊断的高灵敏度呼气氢测试仪。呼气氢测试仪主要是供医疗、科研部门用于检测人体呼出气体中氢气的含量的医疗器械。仪器由传感器、电子电路、呼气前处理系统三部分组成。核心传感器达到ppm级的测量精度，电源部分经过特殊设计，使仪器在一粒pp3工业电池的驱动下可以工作大约3个月，呼气前处理系统对呼气进行干燥和流量控制，极大地延长了传感器的使用寿命。呼气氢测试仪通过检测人体呼出气体中氢气的含量可以诊断小肠细菌过生长症，测定胃排空障碍，诊断乳糖、蔗糖等双糖吸收不良综合症，测定胃肠道传导时间，以及用于胃肠动力学及相关疾病的诊断和研究。     

A Pinhole Camera-Type Multichord Analyzer of Neutral Hydrogen Atoms

The design, operational principle, and results from the calibration of a multichord analyzer of neutral hydrogen atoms and their isotopes, based on the principle of a pinhole camera, is described. The analyzer is designed for studying the spatial distribution of fluxes of fast charge exchange atoms emitted by a high-temperature, magnetically confined plasma. The analyzer's dispersion system is based on electrostatic analysis. The stripping of hydrogen atoms can be performed in both a gas cell with hydrogen and a thin carbon film. The analyzer has seven spatial channels with a full angle of view of 42°. Its energy range is 1–50 keV. The energy resolution for the existing version of the analyzer can be varied between 3 and 12%.     

镶嵌式小型十六极阵列质谱计分析器的研制

结合我国可机加工陶瓷材料及其精密加工技术现状,提出独具特色的小型十六极阵列质谱计分析器的镶嵌式结构。根据分析器电极排列几何精度与质量范围、分辨率之间关系,提出设计要求,给出镶嵌式分析器整体和关键部件的结构设计,以及关键部件的测量结果。分析器的体积和重量为15.4 cm3和50.3 g,质量范围和质量分辨率为50 amu和1 amu。最后,展望了镶嵌式小型十六极阵列质谱计的应用前景。     

Analyzer system for field emission energy distribution (FEED) measurements

A newly designed analyzer system for measuring the energy distribution of field emitted electrons (FEED) is presented. A Kuyatt-Simpson type lens system is combined with a two-stage 127 degrees analyzer. A resolution of 15 meV is obtained with a transmission energy of 0.5 eV.     

Detection of Microscopic Penetrating Flaws in Structures by Localization of Acoustic Fields Generated by Air Flows

A new spectrum analyzer of acoustic fields designed for detecting penetrating flaws is considered. The experimental testing of the apparatus is discussed.     

Equalizing the transmission gain of the energy analyzer-secondary-electron multiplier system

An electric circuit for applying the voltage, determined by the voltage across electrodes of the energy analyzer, to the control grid, placed at the input of the detector of the secondary-electron multiplier, has been designed. With the transmission gains of the analyzer and saw-tooth voltage divider that powers the energy analyzer being equal, the constancy of particle energy at the detector input is maintained and the transmission gain of the section is thereby kept unchanged in the whole energy range of analyzed particles.     

基于PC和MATLAB的电网谐波分析仪

本文探讨一种基于PC和MATLAB的电网谐波分析仪,该分析仪充分利用MATLAB的面向对象技术、强大的科学计算能力和灵活的人机界面,具有成本低、功能强、可扩展性好和电路结构简单等优点。基于PC和MATLAB的电网谐波分析仪,存储容量大、数据处理速度快、精度高,且界面友好,值得推广运用。