基于微波谐振器的谷物湿度检测系统

设计和研制一种能连续测量谷物湿度的微波检测系统.提出利用微波谐振器的干扰特性测量谷物的湿度,并设计专用于谷物湿度检测的中心开通孔的微波谐振器.当谷物颗粒通过微波谐振器的中孔时,其质量和湿度都令谐振器的谐振频率产生偏移和功率衰减,谷物的质量和湿度两者所引起的谐振频率偏移和微波功率衰减是相对独立的,在同一湿度下谷物的质量仅仅与微波功率的衰减量有关.因此在得到谐振频率的偏移量和微波功率的衰减量后,就可以计算谷物的湿度.在大量试验的基础上,对试验数据进行模糊聚类,从而对微波谐振器的频偏和功率衰减特性进行建模,据此设计并研制了谷物湿度的微波连续检测系统.试验调试表明:该检测系统适宜于谷物的连续湿度检测,检测精度达到92%以上.     

微波谐振腔微扰测量法在线监测烟支湿度及密度

时微波谐振腔微扰法检测基本理论和工作原理进行了论述,给出了含有微量水分介质的等效介电常数的计算式,建立了烟支密度和湿度与谐振腔谐振点的频偏及半功率点带宽的数学表达式,设计了适用于烟支湿度密度连续测量的谐振器及检测系统,可实现烟支湿度密度的在线连续测量.该系统采用TM010谐振模,以扫频法检测谐振腔空腔和有烟支状态下的幅频特性,获得谐振频率、峰值功率及半功率带宽.根据相关数学式得到了烟支的湿度和密度.该检测方法具有快速、连续、分辨力高、无污染和操作安全简便等优点.     

高精度微波湿度测量仪

介绍了湿度测量的现状，说明了微波湿度测量的基本原理，并进行了湿度测量仪的设计。提出了一种与密度无关的湿度检测算法，建立起微波参量与湿度之间的线性关系，设计了一种快速高精度检测电路，对微波透过被测物后的衰减和相移进行检测，从实验结果来看达到湿度测量的目的。     

基于3D视觉的轴承端盖表面质量检测系统设计

针对于轴承端盖自动生产线上常用的2D视觉质量检测系统存在对检测环境要求高、对被检工件表面颜色敏感、扫描速度慢等问题,为了提升在线检测的精度及速度,使零件质量在线检测环节更好地融入到自动化生产线中,利用德国康普曼K6系列超高精度线激光传感器设计了一套可用于在线检测的3D视觉质量检测系统,搭配EVT机器视觉处理软件,实现轴承端盖表面质量在线检测、数据处理、在线分析为一体的自动化系统。该系统能够提高检测效率,降低人力成本,提高经济效益。     

自动测试系统微波功率在线测量补偿方法研究与实现

针对自动测试系统微波电缆功率衰减不可控的问题,提出一种微波功率在线测量补偿方法。设计了功率测量装置,在每次测试流程开始前,由自动测试程序控制,测量电缆输出端信号功率,返回模拟电压信号,进而调整微波信号源功率,补偿电缆功率衰减。最后,结合应用实例,对该方法进行了验证与实现。     

测量气体折射率的微波谐振腔频率标定方法

利用微波谐振腔实现对气体折射率的测量,需在真空环境中精确确定测量系统的零点频率,即微波谐振腔零点频率。针对微波谐振腔定标中真空度难以保证的现状,提出了一种常规大气环境下腔体零点频率的标定方法。通过精确测量大气环境的温度、湿度、压强参数得到高精度实时折射率,最后根据得到的高精度实时折射率对腔体谐振零点频率进行调节,以实现谐振腔的零点频率标定。实验结果表明,该方法具有误差小、调节方便的特点,且能够保证整个微波测量系统的测量精度。     

烟支在线微波异物检测系统的研究及应用

针对现有烟支异物检测系统存在的缺陷,利用各种金属或非金属物质的介电常数不相同的特性,研制了一种应用微波技术在线检测烟丝中杂物的系统.当烟支通过微波扫描头进行谐振检测时,若烟支中有异物存在,将会引起微波谐振腔的谐振频率和幅度的变化,分析这些变化就可以在线判断烟支中是否含有异物;检测出存在异物的烟支将通过接装机上的废烟剔除机构剔除,从而可以消除含有异物的烟支对生产厂家和消费者带来的潜在危害,提高出厂的烟支品质.     

配液自动控制系统（南京泽大）

南京金口机械集团有限公司下属企业南京泽大自动化工程有限公司是专业为医药行业提供制药自动化整条生产线工程的高科技型企业。主要从事制药工程与装备自动化工程的研发、工艺与工程设计安装及工程建设总承包等业务。包括自动配液系统、CIP在线清洗、SIP在线灭菌、自动恒温控制、水系统自动控制、中药自动化控制生产线等。     

配液、CIP/SIP自动控制系统及智能温控系统

南京金口机械集团有限公司下属企业南京泽大自动化工程有限公司是专业为医药行业提供制药自动化整条生产线工程的企业。主要从事制药工程与装备自动化工程的研发、工艺与工程设计安装及工程建设总承包等业务,包括自动配液系统、CIP在线清洗、SIP在线灭菌、自动恒温控制、水系统自动控制、中药自动化控制生产线等。     

LED球泡灯在线检测系统设计

为了实现LED球泡灯装配生产线的成品自动化在线检测,提高产品的出厂质量,采用电量仪、积分球和光谱辐射计作为检测仪器,设计了LED球泡灯的在线快速检测系统,主要检测球泡灯的光通量、色温、显色指数、功率和功率因子参数。实验结果表明,该在线检测系统满足了自动化生产线快速和高精度的检测需求,实现了LED球泡灯自动化生产线的成品检测高效率和出厂产品高质量。     

高温超导薄膜微波表面电阻多频点无损测试

根据镜像兰宝石谐振器法原理,设计并制作了一个双模工作的兰宝石介质谐振器.该谐振器利用兰宝石柱中TE011和TE012两个工作模式,在一个温度循环内实现了对高温超导薄膜在不同频点下微波表面电阻值的无损测试.同时,介绍了配对兰宝石的选择方法,并对已知微波表面电阻待测样品进行了改进,以确保镜像兰宝石谐振器法中A、B值准确性.与其他测试方法的谐振器相比,该谐振器具有单片、无损、多频点测试的优点,且其测试步骤也极为简单.     

Low Cost Microwave Sensor for Moisture Content Measurement in Paper Milling Industry

The interest about RF and microwave sensors for the measurement of dielectric properties of materials during industrial processes has been growing recently. Microwave sensors are particularly attractive for their ability of performing non-invasive measurements. An interesting field of application is the real-time moisture measurement during industrial processes. A smart active sensor for measuring the moisture content of felts used in the paper milling industry and more generally of sheet-like materials, is here proposed. The sensor consists of a cavity backed slot resonator interacting with the material under test through near fields. The design aspects of the sensor and the related measuring front-end are discussed with respect to the dielectric properties of the material, and to the resonator response. The parametric sensitivity of the measuring method with the distance between the sample and the sensor surface and the sample thickness is also analyzed. An inversion procedure based on an Artificial Neural Network (ANN) approach is proposed in order to determine the moisture content of the felts. Measurements on several reference felts, with different density, thickness, and moisture content levels, ranging from dry to waterlogged state, proved the effectiveness of the proposed sensor architecture and the ANN-based inversion procedure.     

On-chip integration of high-frequency electron paramagnetic resonance spectroscopy and Hall-effect magnetometry

A sensor that integrates high-sensitivity micro-Hall effect magnetometry and high-frequency electron paramagnetic resonance spectroscopy capabilities on a single semiconductor chip is presented. The Hall-effect magnetometer (HEM) was fabricated from a two-dimensional electron gas GaAsAlGaAs heterostructure in the form of a cross, with a 50 x 50 microm2 sensing area. A high-frequency microstrip resonator is coupled with two small gaps to a transmission line with a 50 Omega impedance. Different resonator lengths are used to obtain quasi-TEM fundamental resonant modes in the frequency range 10-30 GHz. The resonator is positioned on top of the active area of the HEM, where the magnetic field of the fundamental mode is largest, thus optimizing the conversion of microwave power into magnetic field at the sample position. The two gaps coupling the resonator and transmission lines are engineered differently--the gap to the microwave source is designed to optimize the loaded quality factor of the resonator (Q相似文献   

高精度微波时频传递链路体制设计及关键技术

高精度时间频率的产生和超高精度时频信号的传递是现代物理学、天文学和计量科学的基础,中国空间站高精度时频科学实验系统已随“梦天舱”成功发射,标志着我国天地融合、立体交叉的国家时频系统建设迈出了关键一步。介绍了高精度时频科学实验系统项目的基本情况以及微波时频传递链路的研究进展,重点阐述了高精度时频系统微波传递链路的信号体制设计,基于提出的信号体制设计了同频+三频两种微波时频传递链路比对模式并给出了钟差比对模型,最后通过仿真及在轨实测数据分析表明设计的微波时频传递链路可实现亚皮秒级伪距测量精度。     

High-frequency microstrip cross resonators for circular polarization electron paramagnetic resonance spectroscopy

In this article we discuss the design and implementation of a novel microstrip resonator which allows absolute control of the microwaves polarization degree for frequencies up to 30 GHz. The sensor is composed of two half-wavelength microstrip line resonators, designed to match the 50 Omega impedance of the lines on a high dielectric constant GaAs substrate. The line resonators cross each other perpendicularly through their centers, forming a cross. Microstrip feed lines are coupled through small gaps to three arms of the cross to connect the resonator to the excitation ports. The control of the relative magnitude and phase between the two microwave stimuli at the input ports of each line allows for tuning the degree and type of polarization of the microwave excitation at the center of the cross resonator. The third (output) port is used to measure the transmitted signal, which is crucial to work at low temperatures, where reflections along lengthy coaxial lines mask the signal reflected by the resonator. Electron paramagnetic resonance spectra recorded at low temperature in an S=5/2 molecular magnet system show that 82% fidelity circular polarization of the microwaves is achieved over the central area of the resonator.     

微波器件衰减量检定系统设计

本文介绍了利用AV1487微波信号源、MA2474D功率传感器、ML2437A功率计、构建微波器件衰减量检定系统,特别是针对不同的被检定对象和不同检定频率点的要求,通过建立检定点数据库方法,实现功能扩展进行了详细的描述,系统具有创新性,对从事自动检定程序设计者具有重要参考借鉴价值.     

基于USB数据通信的液位测控系统

液位是储液罐注料过程的关键技术指标,直接影响着储液罐储藏和注料的安全性。针对诸多行业储液罐液位测控的特点和技术要求,设计了一种基于USB数据通信的液位测控系统,应用磁致伸缩液位传感器检测储液罐的液位信号,通过A/D采集卡实现液位信号的转换与USB通信方式的数据传输,研发了基于LabVIEW语言的数字滤波算法和数字PID控制算法,实现了液位实时检测和控制。现场应用和实验表明,该系统具有较高的测量精度、控制精度和系统可靠性,较强的现场环境适应性,扩大了该系统的应用范围。     

孔系钻削振动信号特征波动可视化研究及其应用

为解决工程应用中切削参数一致的孔系加工质量一致性评估的难题,提出了一种基于振动信号特征波动可视化的聚类分析方法。首先采用振动传感器监控孔系钻削过程,提取各孔振动信号小波包能量谱和高阶统计量特征;然后利用雷达图得到各孔振动信号特征矩阵分布图,提取信号特征雷达图多边形重心特征;最后采用模糊C-均值（FCM）算法对雷达图平面重心点集进行聚类分析。理论分析结果与人工检测结果对比表明：该方法可直观呈现孔系钻削质量分布情况,简便、可靠地实现孔系钻削质量的一致性评估。     

Stable microwave coaxial cavity plasma system at atmospheric pressure

We present a systematic study of the development of a novel atmospheric microwave plasma system for material processing in the pressure range up to 760 torr and the microwave input power up to 6 kW. Atmospheric microwave plasma was reliably produced and sustained by using a cylindrical resonator with the TM(011) cavity mode. The applicator and the microwave cavity, which is a cylindrical resonator, are carefully designed and optimized with the time dependent finite element Maxwell equation solver. The azimuthal apertures are placed at the maximum magnetic field positions between the cavity and the applicator to maximize the coupling efficiency into the microwave plasma at a resonant frequency of 2.45 GHz. The system consists of a magnetron power supply, a circulator, a directional coupler, a three-stub tuner, a dummy load, a coaxial cavity, and a central cavity. Design and construction of the resonant structures and diagnostics of atmospheric plasma using optical experiments are discussed in various ranges of pressure and microwave input power for different types of gases.