• 제목/요약/키워드: Condensation Particle Counter

검색결과 49건 처리시간 0.02초

한반도 상공의 응결핵 연구를 위한 기상항공기 나라호의 응결핵입자계수기 개선 및 관측 (Improvement and Observation of Condensation Particle Counter in Atmospheric Research Aircraft NARA for Condensation Particle Research in Korea)

  • 정운선;구정모;김민성;신혜민;고아름;장기호;차주완;이용희
    • 한국환경과학회지
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    • 제31권9호
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    • pp.803-813
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    • 2022
  • In this study, we improved the water-based condensation particle counter in Atmospheric Research Aircraft NARA and investigated the condensation particle number concentration over the Korean peninsula. Pump and set point information were changed to improve the instrument used by aircraft for observation. Ground-based observational result showed that the error between two instruments, which are water-based condensation particle counter and butanol-based condensation particle counter, was 4.7%. Aerial observational result revealed that the number concentration before improvement indicate large variation with unstable condition, whereas the number concentration after improvement indicate a reasonable variation. After improvement, the number concentration was 706±499 particle/cm3 in the West Sea and 257±80 particle/cm3 in Gangwon-do, and these are similar to the concentration range reported in previous studies. Notably, this is the first attempt to use aerial observation with water-based condensation particle counter to investigate condensation particle number concentration.

드론을 이용한 안면도 상공 대기경계층내의 미세먼지 연직분포 및 Flux 측정 (Vertical Aerosol Distribution and Flux Measurement in the Planetary Boundary Layer Using Drone)

  • 김희상;박용희;김우영;은희람;안강호
    • 한국입자에어로졸학회지
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    • 제14권2호
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    • pp.35-40
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    • 2018
  • Vertical particle size distribution, total particle concentration, wind velocity, temperature and humidity measurement was performed with a drone. The drone was equipped with a wind sensor, house-made optical particle count(Hy-OPC), condensation particle counter(Hy-CPC), GPS, Temperature, Relative Humidity, Pressure and communication system. Base on the wind velocity and the particle size vertical distribution measurement with drone, the particle mass flux was calculated. The vertical particle distribution showed that the particle number concentration was very strongly correlated with the relative humidity.

Differential Mobility Analyzer(DMA)와 Condensation Nuclei Counter(CNC)를 이용한 입자크기 분포 측정에서 샘플링 튜브와 CNC에서의 혼합 효과가 입자 크기 분포 측정에 미치는 영향에 관한 연구 (Study on the Contribution of Mixing Effects in Sampling Tube and Condensation Nuclei Counter(CNC) to the measurement of size distribution obtained using Differential Mobility Analyzer and CNC)

  • 이윤수;안강호
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집D
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    • pp.104-109
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    • 2001
  • The time to measure the size distribution using Condensation Nuclei Counter(CNC) and Differential Mobility Analyzer(DMA) can be shortened by classifying particles ramping the DMA voltage exponentially and continuously. In measurement, particles sampled at different time are mixed together going through sampling tube and CNC. Because the size distribution is inversed by using detector responses to sampling time intervals in this accelerated method, the mixing effects give inversion errors to the size distribution. The mixing effects can be considered by appling the transfer function with mixing effects to the data inversion. The inversion considering this effects gives birth to the size distribution shifted to the opposite direction of the size scanning.

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바이오디젤 사용에 따른 경유승용차의 나노입자 배출특성 연구 (A Study on the Nano-particles Emission Exhausted from Diesel Passenger Vehicle According to Using Biodiesel)

  • 권상일;이창식
    • 한국분무공학회지
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    • 제12권1호
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    • pp.65-70
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    • 2007
  • This paper is to investigate the characteristics of exhaust emissions and nano-particle emission from diesel passenger vehicle according to using biodiesel fuel as an alternative fuel. In this work, the particulate matters (PM) of exhaust emissions in diesel engine were investigated by number of particles and mass measurement. The mass of the total PM was measured using the standard gravimetric measurement method, the total number concentrations were measured on a ECE15+EUDC driving cycle using Condensation Particle Counter (CPC). Total PM emission was reduced $2{\sim}38%$ and number concentration was reduced $1{\sim}27%$ according to increasing blended ratio of biodiesel with diesel fuel. Total PM emission was reduced more than particle number emission because volatile particles were measured in total PM but were not measured in particle number emissions.

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응집입자와 비응집 입자의 CNC 내에서 응축성장에 관한 실험적 연구 (The growth effect of agglomerated and nonagglomerated particles in Condensation Nuclei Counter (CNC))

  • 김영원;문형우;윤진욱;안강호
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집D
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    • pp.579-584
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    • 2001
  • Agglomerated and nonagglomerated SiO2 particles are synthesized in furnace by the electrohydrodynamic spraying method and the vapor feeding method for the test particle generator this study. These polydispersed particles are classified with DMA to extract equal mobility particles. Then these particles are introduced into CNC (Condensation Nuclei Counter) to see the pulse height using Multi-channel Analyzer. The response characteristics of these two kinds of particles in CNCs (TSI CNC 3022 and 3025A) have been studied as a function of particle size using mono disperse particles classified by DMA. The results show that the higher drag resistance particles, so called agglomerated particles have generated a lower CNC pulse height than the spherical particles for these two different CNCs, which means the nonagglomerated particles may start to grow larger than the agglomerated particles.

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Characteristics of Nano-Particles Exhausted from Diesel Passenger Vehicle with DPF

  • Park, Yong-Hee;Shin, Dae-Yewn
    • 한국환경보건학회지
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    • 제32권6호
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    • pp.533-538
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    • 2006
  • The nano-particles are known to influence the environmental protection and human health. The relationships between transient vehicle operation and nano-particle emissions are not well-known, especially for diesel passenger vehicles with DPF(Diesel Particulate Filter). In this study, two diesel passenger vehicles were measured on a chassis dynamometer test bench. The particulate matter (PM) emission of these vehicles was investigated by number and mass measurement. The mass of the total PM was evaluated using the standard gravimetric measurement method, and the total number concentrations were measured on a ECE15+EUDC driving cycle using Condensation Particle Counter (CPC). According to the investigation results, total number concentration was $1.14{\times}10^{11}$M and mass concentration was 0.71mg/km. About 99% of total number concentration was emitted during the $0{\sim}400s$ because of engine cold condition. In high temperature and high speed duration, the particulate matter was increased but particle concentration was emitted not yet except initial engine cold condition According to DPF performance deterioration, the particulate matter was emitted 2 times and particle concentration was emitted 32 times. Thus DPF performance deterioration affects particle concentration more than PM.

디젤 승용차량 시험모드별 극미세입자 배출 특성 해석 (Analysis of Diesel Nano-particle Characteristics for Different Vehicle Test Mode in Diesel Passenger Vehicle)

  • 이진욱;정민원;정용일;차경옥
    • 한국자동차공학회논문집
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    • 제16권1호
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    • pp.114-120
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    • 2008
  • Recently, the nano-PM's number concentration emitted by diesel internal combustion engine has focused on attention because this particulate matters are suspected being hazardous of human health. In this study, The nano-PM mass and size of diesel passenger vehicles were measured on chassis dynamometer test bench. The particulate matters(PM) emissions of these vehicles were investigated by number concentration too. A condensation particle counter(CPC) system was applied to measure the particle number and size concentration of diesel exhaust particles at the end of dilution tunnel along the NEDC(ECE15+EUDC) and CVS-75 vehicle test mode. As the research result, the characteristic of vehicle test mode on the diesel nano-particle number and size distribution was investigated in this study.

Tethered-Balloon Package System 개발 및 대기 에어로졸의 연직 분포 측정 (Development of Tethered-Balloon Package System for Vertical Distribution Measurement of Atmospheric Aerosols)

  • 은희람;이홍규;이양우;안강호
    • 한국입자에어로졸학회지
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    • 제9권4호
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    • pp.253-260
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    • 2013
  • For a vertical atmospheric aerosol distribution measurement, a very compact and light particle sampling package is developed. This package includes a compact optical particle counter (Hy-OPC), a light and small condensation particle counter (Hy-CPC), sensors (GPS, wind velocity, temperature, humidity), and a communication and system control board. This package is attached to He balloon and the altitude is controlled by a winch. Using this system the vertical particle size distribution was measured. The test results showed that the ground base atmospheric particle measurement result may be a lot different from that high above the ground.

실시간 입자분포 측정을 위한 Radial Exhaust Multi-port System의 개발 및 성능평가 (Development and Performance Evaluation of Radial Exhaust Multi-port System for Real-time Particle Size Distribution Measurement)

  • 이홍규;이양우;전기수;안강호
    • 한국입자에어로졸학회지
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    • 제9권3호
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    • pp.133-137
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    • 2013
  • Measuring particle size distribution is one of the primary concerns in aerosol studies. For a nano-particle size distribution measurement, many scientists use a combination of a differential mobility analyzer (DMA) and a condensation particle counter (CPC) system, which is a called scanning mobility particle sizer (SMPS). Although it has a very high particle size resolution, some issues still remain. These problems include residence time between a DMA and a CPC, discontinuity of a CPC, and disturbance due to long scanning time during the precise measurement of particles. In particular, long scanning time is not adequate for measuring particle size distribution since the particle concentration is changing during the measurement. In this study, we developed radial exhaust multi-port system (REM-system) with no scanning time and high resolution to measure real-time particle size distribution. As a result of the REM-system performed using mono-disperse particle, it is expected that this system will be suitable for measuring continuously changing aerosol. If the counting efficiency of multi-condensation particle counter (M-CPC) and data inversion matrix are completed, REM-system will be a very adequate system for unsteady aerosol, which changes for SMPS scanning time.

구동 및 정지시 하드 디스크 드라이브 내 입자 발생 특성에 관한 실험적 연구 (Investigation of Particle Generation in a Hard Disk Drive During the Start/Stop Period)

  • 박희성;유용철;배귀남;황정호
    • 대한기계학회논문집B
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    • 제23권6호
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    • pp.744-752
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    • 1999
  • Particle contamination in a hard disk drive has been recognized as an important issue because particles can significantly affect the reliability of the drive. In this study, characteristics of the particle generation in a hard disk drive during the start/stop period were investigated. The number of particles generated in the drive was measured at 5 locations by using condensation nucleus counters(CNC) with sampling probes. It was found that most of particles were generated whenever the drive started or stopped. The number of particles detected by the condensation nucleus counter depended on sampling parameters including sampling location, shape of sampling probe, and sampling velocity.