development of miniature sizers for ultrafine particle
Experimental evaluation of miniature plate DMAs (mini
ABSTRACTTwo iPhone-sized differential mobility analyzers (DMAs) in the parallel-plate configuration (i.e. mini-plate DMAs) were designed and their performance was calibrated in this study in order to gain the instructive knowledge for the future mini-plate DMA design and to have a well-calibrated mini-plate DMA for the ultrafine particle (UFP) sensor network.
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A Cost-effective Miniature Electrical Ultrafine Particle
Schematics of assembled miniature electrical ultrafine particle sizers (mini-eUPS). After taking the temperature and relative humidity measurement the particle stream is directed to a mini-plate unipolar charger (shown in Fig. 2(a)) to electrically charged particles (Liu
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Simulation of Miniature PDMA for Ultrafine-Particle
The effect of the design and process parameters of a particle-classification zone on the sizing precision of a plate differential mobility analyzer (PDMA) was investigated by simulation software in this work. The design parameters consisted of the length width and height of the classification zone and the process parameters could lead to height deviation and an uneven classification-zone wall.
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(PDF) Design and evaluation of a mini-Faraday cup for
In this study a mini-Faraday cup for portable ultrafine particle sizer was designed which consisted of a cylindrical metal case a filter holder a Teflon insulator and an internal metal filter.
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Ultrafine particleWikipedia
Ultrafine particles (UFPs) are particulate matter of nanoscale size (less than 0.1 μm or 100 nm in diameter). Regulations do not exist for this size class of ambient air pollution particles which are far smaller than the regulated PM 10 and PM 2.5 particle classes and are believed to have several more aggressive health implications than those classes of larger particulates.
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MEMS-based particle detection system for measuring
Nov 01 2018 · The particle number concentration can be calculated using the following equation with assumed log-normal particle size distribution 22 23 (1) N t o t a l = I t o t a l e ∙ Q ∙ α ∙ d p m e a n β ∙ exp β 2 2 l n 2 σ g where N total is the particle number concentration I total is the electrical current from the charged particles
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Development of Miniature Sizers for Ultrafine Particle
Particle Lab VCU Miniature Electrical Ultrafine Particle Sizer (mini- eUPS) (funded by US EPA) Key components mini- eUPS mini-plate DMA/EAA mini-Faraday cage with pre-amp Features included mini-plate aerosol charger Portable Cost-effective Energy efficient Real-time on particle size
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Particulate Sensor Technology Development at NASA Glenn
determination of statistical moments of aerosol size distributions for d > 200 nm. R D 100 recipient 2011 • Miniature Optical Particle Counter (mOPC) A single particle optical scattering sensor for particulate counting and sizing for d > 200 nm. • Microscale Particle Classifier A differential mobility classifier for ultrafine
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Experimental evaluation of miniature plate DMAs (mini
Mar 22 2016 · The compact size of mini-plate DMAs make it suitable to incorporate in low-cost and compact ultrafine particle sizers. For the sizing accuracy of mini-plate DMAs a correction factor (η) was proposed to modify the equation derived from the 2D assumption in order to better determine the applied voltage for sizing particles with the selected
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(PDF) Design and evaluation of a mini-Faraday cup for
In this study a mini-Faraday cup for portable ultrafine particle sizer was designed which consisted of a cylindrical metal case a filter holder a Teflon insulator and an internal metal filter.
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A field application of a personal sensor for ultrafine
Mar 01 2015 · The PUFP (US patent # US 8 449 65) deployed in the field test is a condensation particle counter (CPC) with a total-system-volume of 1500 cm 3 a weight of 1 kg and approximately 6 h of continuous battery operation (for additional specifications see enmont).The PUFP is comprised of an evaporation–condensation-tube a miniature diaphragm air pump an optical detection module
Chat OnlineA Cost-effective Miniature Electrical Ultrafine Particle
A Cost-effective Miniature Electrical Ultrafine Particle Sizer (mini- eUPS) for UFP Monitoring Network . Qiaoling Liu1 Di Liu1 Xiaotong Chen1 2 Qiang Zhang2 Jingkun Jiang2 and Da-Ren Chen1 2 . 1Particle laboratory . Department of Mechanical and Nuclear Engineering
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An Ultrafine Aerosol Condensation Nucleus Counter
The development of a condensation nucleus counter (CNC) for detecting ultrafine aerosol (UFA) particles (particle diameter 5 20 nm) is described here. This instrument is designed specifically for high-efficiency detection and counting of ultrafine particles. It is a
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OSA Development of a new Portable Ultrafine Particle
A new portable Ultrafine Particle Sizer based on unipolar charger and mini-plate DMA has been developed to monitor indoor aerosol. The performance of the Ultrafine Particle Sizer is discussed in detail. © 2017 Optical Society of America
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Séminaire Daren CHEN CaPPA
In this talk we will discuss our development effort in the miniaturization of electrical mobility particle sizers including the development of a mini-plate aerosol charger for electrically charging sampled particles a mini-plate DMA for particle sizing based on particle electrical mobility and a mini Faraday cage with sensitive pre-amp for
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(PDF) Simulation of Miniature PDMA for Ultrafine-Particle
Simulation of Miniature PDMA for Ultrafine-Particle Measurement the structure of the ultrafine particle size distribution in 1955.The development of the Whitby Aerosol Analyzer in 1966 built
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Ultrafine Particle Emission Control Strategies
Typical engine exhaust particle size distribution by mass it consists of 3 size modes formed by different processes 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1 10 100 1 000 10 000 Diameter (nm) Normalized Concentration (1/C total)dC/dlogDp Mass Fine Particles Dp < 2.5 µm Ultrafine Particles Dp < 100 nm Nanoparticles Dp < 50 nm Accumulation Mode
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Ultrafine Particle Emission Control Strategies
Typical engine exhaust particle size distribution by mass it consists of 3 size modes formed by different processes 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1 10 100 1 000 10 000 Diameter (nm) Normalized Concentration (1/C total)dC/dlogDp Mass Fine Particles Dp < 2.5 µm Ultrafine Particles Dp < 100 nm Nanoparticles Dp < 50 nm Accumulation Mode
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A field application of a personal sensor for ultrafine
Mar 01 2015 · The PUFP (US patent # US 8 449 65) deployed in the field test is a condensation particle counter (CPC) with a total-system-volume of 1500 cm 3 a weight of 1 kg and approximately 6 h of continuous battery operation (for additional specifications see enmont).The PUFP is comprised of an evaporation–condensation-tube a miniature diaphragm air pump an optical detection module
Chat OnlineExperimental evaluation of miniature plate DMAs (mini
develop a cost-effective miniature particle sizer (with sensitive aerosol electrometers as the particle concentra-tion detectors) for the UFP sensor network. These UFP sizers are estimated less than 0.8 kg in total weight and approximately 400 £ 5 00£ 5 in the final package (includ-ing all the accessaries). The selection of plate DMAs is
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NaNo Particle Counters and SizersLAF Technologies
GRIMM manufactures particle counters and sizers as well as particle generators for a size range from 0.8 nanometer to greater than 30 micrometer. For an overview please re-fer to our catalogs for the Environmental Dust Monitors and the Portable Indoor Dust Monitors. Typical applications are • Inhalation exposure studies
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Ultrafine particles unique physicochemical properties
Mar 17 2020 · Ultrafine particles (UFPs) are particles with an aerodynamic diameter of 0.1 µm (100 nm) or less 1 2.Particles may be described in terms of surface area per particle in terms of particle number
Chat OnlineExperimental evaluation of miniature plate DMAs (mini
ABSTRACTTwo iPhone-sized differential mobility analyzers (DMAs) in the parallel-plate configuration (i.e. mini-plate DMAs) were designed and their performance was calibrated in this study in order to gain the instructive knowledge for the future mini-plate DMA design and to have a well-calibrated mini-plate DMA for the ultrafine particle (UFP) sensor network.
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A Cost-effective Miniature Electrical Ultrafine Particle
A cost-effective miniature electrical ultrafine particle sizer (mini-eUPS) has been developed for future UFP (ultrafine particle) monitoring networks in cities with high traffic density and in communities close to freeways airports or stationary combustion sources.
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Workplace Measurements of Ultrafine Particles—A Literature
Still in most of the studies that reported UFP the upper size limit was not fixed and the measured particle size range included particle sizes as high as 10 µm. Typically the total particle number concentration is dominated by the UFPs but this cannot be generalized and the influence of particles >100 nm cannot be automatically ignored
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"Ultrafine particle generation and measurement" by
Ultrafine particles (UFPs) with diameters smaller than 100 nm are omnipresent in ambient air. They are important sources for fine particles produced through the agglomeration and/or vapor condensation. With their unique properties UFPs have also been manufactured for industrial applications. But from the toxicological and health perspective ultrafine particles with high surface-to-volume
Chat OnlineExperimental evaluation of miniature plate DMAs (mini
Mar 22 2016 · The compact size of mini-plate DMAs make it suitable to incorporate in low-cost and compact ultrafine particle sizers. For the sizing accuracy of mini-plate DMAs a correction factor (η) was proposed to modify the equation derived from the 2D assumption in order to better determine the applied voltage for sizing particles with the selected
Chat OnlineA Cost-effective Miniature Electrical Ultrafine Particle
ABSTRACT A cost-effective miniature electrical ultrafine particle sizer (mini-eUPS) has been developed for future UFP (ultrafine particle) monitoring networks in cities with high traffic density and in communities close to freeways airports or stationary combustion sources. The mini-eUPS mainly consists of a mini-plate unipolar particle charger a mini-plate differential mobility classifier
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"Miniaturization of Electrical Ultrafine Particle Sizers
To meet the increasing demanding for personal exposure monitoring and spatial distribution measurements of ultrafine particles this dissertation studied the development and miniaturization of electrical ultrafine particle sizers (EUPS).
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A Miniature Aerosol Sensor for Detecting Polydisperse
Counting and sizing of polydisperse airborne nanoparticles have attracted most attentions owing to increasing widespread presence of airborne engineered nanoparticles or ultrafine particles. Here we report a miniature aerosol sensor to detect particle size distribution of polydisperse ultrafine part
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