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Development of an on-line measurement system for water-soluble organic matter in PM_(2.5) and its application in China

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Journal of Environmental Sciences 2018年第7期30卷 33-40页

作者： Huiying Li Xiaofeng Huang Liming Cao Yuhong Zhai Liwu Zeng Lingyan He Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School

Water-soluble organic matter（WSOM） represents a critical fraction of fine particles（PM2.5）in the air, but its changing behaviors and formation mechanisms are not well understood yet, partly due to the lack of fast techniques for the ambient measurements. In this study,a novel system for the on-line measurement of water-soluble components in PM2.5, the particle-into-liquid sampler（PILS）–Nebulizer–aerosol chemical speciation monitor（ACSM）, was developed by combining a PILS, a nebulizer, and an ACSM. High time resolution concentrations of WSOM, sulfate, nitrate, ammonium, and chloride, as well as mass spectra, can be obtained with satisfied quality control results. The system was firstly applied in China for field measurement of WSOM. The mass spectrum of WSOM was found to resemble that of oxygenated organic aerosol, and WSOM agreed well with secondary inorganic ions. All evidence collected in the field campaign demonstrated that WSOM could be a good surrogate of secondary organic aerosol（SOA）. The PILS–Nebulizer–ACSM system can thus be a useful tool for intensive study of WSOM and SOA in PM2.5.

关键词： PM2.5 Water-soluble organic matter Secondary organic matter on-line measurement Mass spectrum

on-line measurement of the Chemical Oxygen Demand in Wastewater in a Pulp and Paper Mill Using Near Infrared Spectroscopy

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Spectral Analysis Review 2014年第4期2卷 19-25页

作者： John Dahlbacka Josefina Nystrom Torgny Mossing Paul Geladi Tom Lillhonga Unit for Research and Development Novia University of Applied SciencesVaasaFinland Department of Forest Biomaterials and Technology Swedish University of Agricultural SciencesUmeaSweden

Although near infrared (NIR) spectroscopy has been evaluated for numerous applications, the number of actual on-line or even on-site industrial applications seems to be very limited. In the present paper, the attempts to produce online predictions of the chemical oxygen demand (COD) in wastewater from a pulp and paper mill using NIR spectroscopy are described. The task was perceived as very challenging, but with a root mean square error of prediction of 149 mg/l, roughly corresponding to 1/10 of the studied concentration interval, this attempt was deemed as successful. This result was obtained by using partial least squares model regression, interpolated reference values for calibration purposes, and by evenly distributing the calibration data in the concentration space. This work may also represent the first industrial application of online COD measurements in wastewater using NIR spectroscopy.

关键词： Chemical Oxygen Demand (COD) Industrial Wastewater Near Infrared Spectroscopy (NIR) Multivariate Calibration on-line measurement

High-power TM_(01) millimeter wave pulse sensor in circular waveguide

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Chinese Physics B 2015年第9期24卷 566-571页

作者：王光强朱湘琴陈再高王雪锋张黎军 Northwest Institute of Nuclear Technology Science and Technology on High Power Microwave Laboratory

By investigating the interaction of an n-type silicon sample with the TM01 mode millimeter wave in a circular waveguide, a viable high-power TM01 millimeter wave sensor is proposed. Based on the hot electron effect, the silicon sample serving as a sensing element（SE） and appropriately mounted on the inner wall of the circular waveguide is devoted to the on-line measurement of a high-power millimeter wave pulse. A three-dimensional parallel finite-difference time-domain method is applied to simulate the wave propagation within the measuring structure. The transverse electric field distribution, the dependences of the frequency response of the voltage standing-wave ratio（VSWR） in the circular waveguide, and the average electric field amplitude within the SE on the electrophysical parameters of the SE are calculated and analyzed in the frequency range of 300–400 GHz. As a result, the optimal dimensions and specific resistance of the SE are obtained,which provide a VSWR of no more than 2.0, a relative sensitivity around 0.0046 kW-1 fluctuating within ±17.3%, and a maximum enduring power of about 4.3 MW.

关键词： circular waveguide high-power millimeter wave on-line measurement

The device design on Dynamic Magnetic Flux measurement by the Type-C Transducer

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The device design on Dynamic Magnetic Flux Measurement by th...

第36届中国控制会议

作者： Xubing Yuan Xuxuan Chen School of Information Science and Engineering Wuhan University of Science and Technology

ISBN: (纸本)9781538629185

As for the problems including complexity,high cost and complex mathematical derivation for present traditional magnetic flux measurement technologies,a hardware circuit design method of magnetic flux measurement device based on type-C transducer is *** measurement device mainly places an auxiliary core at the measured device,the auxiliary core shares a part of the magnetic circuit with the main magnetic circuit,coil inductance is gained by detecting micro current signal at the auxiliary core,which reflects operating state of main flux in real *** device mainly consists of high-frequency drive power supply,type-C auxiliary core,signal acquisition module,signal processing module and so *** measurement device is more reliable,simple and easily implemented compared with traditional measurement ways;it can realize on-line measurement for operating characteristics of electromagnetic equipment in real *** the end of this paper,through the experiments verify the feasibility,and analyzed the purpose and significance of this experimental design,so this paper can offer reliable ways for the development direction of low-budget,high-precision and practical detection ways of electromagnetic equipment’s performance parameters.

关键词： magnetic flux type-C hall sensor micro current on-line measurement

measurement of Particle Velocity, Particle Size Distribution and Concentration in Particulate Suspension by Transmission Fluctuation Correlation Spectrometry

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International Journal of Clean Coal and Energy 2022年第2期11卷 13-23页

作者： Peng Gong College of Science University of Shanghai for Science and Technology Shanghai China

In coal-fired power generation industry, parameters such as particle size affect combustion efficiency. Especially in the application of two-phase flow clean energy, the parameters such as particle velocity, particle size distribution and concentration are very important, because the coal particle velocity, concentration or size range have an impact on the whole combustion process. This paper introduces an optical measurement setup based on the transmission fluctuation correlation spectrum measurement technique, which realizes the simultaneous measurement of particle velocity, particle size distribution and concentration. Compared with image method, ultrasonic spectrum method and other methods, the experimental device is simple and low-cost.

关键词： on-line measurement Two-Phase Flow Transmission Fluctuation Correlation Spectrum Energy and Power

Strain measurement of Foil Material in Micro-machining Based on Computer Vision

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Strain Measurement of Foil Material in Micro-machining Based...

2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies

作者： Xu Zhenying Wang Yun Fei Yetai School of Mechanical Engineering Jiangsu Univ. Zhenjiang Jiangsu 212013 PRC School of Instrumentation Hefei Univ. of Science andTechnology Hefei Anhui 230009 PRC

＜正＞Micro-machining plays an important role in MEMS. In the micro-machining, the influences of the surface effect and the size effect must be considered. Moreover, the deformation and damage mechanics of the materials of the micro parts are different from those of the macro ones. Thus, traditional measuring methods are unsuitable for the micro-machining. In this paper, a new apparatus based on the computer vision is developed to measure the micro tensile strain of foil material in the micro-machining. A three-CCD computer vision system is constructed. Through image processing and calculation the micro-strain of the specimen is obtained. Therefore, on-line measurement of the micro-strain in the micro-machining can be realized by this system.

关键词： Micro-machining MEMS Computer vision micro-strain CCD Image processing on-line measurement

An Online Intelligent Control Method for Surface Roughness of Cold-Rolled Strip Steel

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An Online Intelligent Control Method for Surface Roughness o...

第37届中国控制会议

作者： Sheng-He Chen Jian-Guo Wang Ting-Quan Gu Cold Rolling Department Baoshan Iron & Steel Co. Ltd School of Mechatronical Engineering and Automation Shanghai University Shanghai Key Lab of Power Station Automation Technology Central Research Institute(R.& D.Center) Baoshan Iron & Steel Co. Ltd

The control of surface roughness is of great significance for measuring the quality characteristics of cold-rolled steel strip. At present, the conventional method is used to monitor the surface roughness of steel strip by random sample inspection,off-line analysis and test, and on-line adjustment of production process, but the method is of some hysteretic nature and discontinuity. To this end, the paper presents an on-line intelligent control method for surface roughness of the cold-rolled steel strip, adjusting parameters of the skin-pass process in real time and reducing the fluctuation of surface roughness of strip steel. To establish the fuzzy neural network control model of the corresponding relationship between the parameters of the skin-pass process and the surface roughness of steel strip, the deviation between the online detection value and the target value of the surface roughness is taken as the input of the model, so is the differential value of deviation. In addition, the skin-pass rolling force is used as the output. Learning and training fuzzy neural network to get a fuzzy neural network online prediction control model that is applied to continuous treatment unit for cold rolling strip steel. By measuring the surface roughness of steel strip, the system adjusts the skin-pass rolling force in real time. At the same time, to keep the mechanical properties of the steel strip and the strip shape, the system optimizes skin-pass rolling tension and bending force accordingly to realize on-line intelligent control for the surface roughness of steel strip. The proposed system can improve the control accuracy of surface roughness, which can even better satisfy the requirements of downstream users.

关键词： Cold rolled steel strip Surface roughness on-line measurement Fuzzy neural network Intelligent control

On-line Yarn Evenness Detection Using CCD Image Sensor

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On-line Yarn Evenness Detection Using CCD Image Sensor

2011 Chinese Control and Decision Conference（CCDC）

作者： Qin Weigang is with the School of Electrical Engineering and Automation,Tianjin Polytechnic University,Tianjin,China,300160

This paper introduces the method of on-line measurement of the yarn evenness using a CCD image *** sensor is mounted on a movable bracket of the small *** obtained yarn coefficients of variation in the diameter through computer and digital image processing techniques are compared with those of using off-line USTERII evenness *** a certain extent,avoiding affection of the incident light intensity,the CCD sensor overcomes the shortcomings of the conventional photoelectric *** sensor also uses a 250,000-pixel CCD equivalent to that of a conventional machine vision *** allows presence detection and recognition of different objects,which have up till now been performed by a human,to be executed fast and *** with modern control theory,fuzzy control and expert system are designed to collect and process real-time data of the measuring *** results of on-line measurement show that the average error accuracy is less than 5.5% in the *** addition,it is also found that the achieved data from the on-line device are coherent and correlative with USTER statistical bulletin ***,the development of the portable,higher cost-effective measuring device has a positive role in promoting the textile industry and improving the quality of the yarn.

关键词： Yarn Evenness on-line measurement CCD Image Sensor Signal Processing

INVESTIGATION OF ON line MEASURING PARTICLE CONCENTRATION BY SCATTERING INTEGRATION

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INVESTIGATION OF ON LINE MEASURING PARTICLE CONCENTRATION BY...

多相流研究进展国际会议

作者： Qi Pan Yangjun Zhao Rofei Zhang Guanghua Tang Shimin Wang Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education Southeast University Nanjing 210096 China

＜正＞ On-line measuring the dust concentration by scattering integration is developed in this paper. It based on the particle diameter distribution function and the integral transform inverse arithmetic of Fraunhofer diffraction theory. Compared with the extinction techniques, the new method need not pre-required knowledge about the size of particles in the flow. Numerical simulation using the Fraunhofer diffraction also confirmed the validity of this technique and its applied range. The on-line measurement investigation is also carded out on the experiment system. The measurement system based on the method is calibrated by the Iso-kinetic sampling techniques. A prototype instrument has been verified in an exhaust dust of a steel-industry for running over 3000 hours. The results of these experiments prove that the mean method is reliable and feasible.

关键词： the mean method on-line measurement dust concentration Fraunhofer diffraction