• Title/Summary/Keyword: Particle Counter

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Development and Performance Test of In-situ Particle Monitoring System using Ion-counter in Vacuum Environments (진공 환경내 실시간 입자 모니터링 시스템의 개발 및 성능평가)

  • Ahn Kang-Ho;Kim Yong-Min;Kwon Yong-Taek
    • Journal of the Semiconductor & Display Technology
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    • v.5 no.1 s.14
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    • pp.45-49
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    • 2006
  • In this paper, a new method that monitors the quantity of particles using ion-counter in vacuum environment is introduced. In-situ particle monitoring (ISPM) system is composed by Gerdien type ion-counter (house-made), DC power supply and electrometer. The ion-counter applied by positive voltage detects only positive charged particles. Therefore the particles to be detected should be in known charge state for further data analysis. ion-counter is installed at the exhaust line of process equipment where the pressure loss is structurally low. ISPM system performance has been verified with SMPS (Scanning Mobility Particle Sizer) system. The correlation coefficient is above 0.98 at the particle size range of $20{\sim}300nm$ in diameter with identified charge distribution under $0.1{\sim}10.0$ Torr.

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

  • Kim, Heesang;Park, Yonghe;Kim, Wooyoung;Eun, Heeram;Ahn, Kang-Ho
    • Particle and aerosol research
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    • v.14 no.2
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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.

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

  • Jung, Woonseon;Ku, Jung Mo;Kim, Min-Seong;Shin, Hye-min;Ko, A-Reum;Chang, Ki-Ho;Cha, Joo Wan;Lee, Yong Hee
    • Journal of Environmental Science International
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    • v.31 no.9
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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.

Application of Particle Counter in Water Treatment Process (정수처리공정에서의 입자분석 적용방안)

  • Shin, Sang-Hee;Jeon, Hyun-Sook;Lee, Chan-Hyung;Bae, Gi-Soo
    • Journal of Korean Society on Water Environment
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    • v.29 no.3
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    • pp.337-342
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    • 2013
  • The particle counter compared with the turbidimeter provides good precision and sensitivity and can get the characteristics of particulates effectively. The purpose of this study is to provide the application of particle counter in sand and activated carbon filters. The particle count by size could be more easily sense when the water quality is changed by the influent of high turbidity or algae. We could decide the optimal backwashing cycles and detect the efficiencies of filters by monitoring the total particle count of effluent in sand and activated carbon filters.

Discussion of Problems During the Application of the On-line Particle Counter In Water Treatment Process (정수처리 공정에서 연속식 입자계수기의 적용성 검토에 관한 연구)

  • Moon, Seong-Yong;Kim, Seung-Hyun
    • Journal of Korean Society of Water and Wastewater
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    • v.19 no.2
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    • pp.214-220
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    • 2005
  • Errors may occur due to analysis methods and water quality during the application of the on-line particle counter In water treatment process. Errors caused by analysis methods include particle destruction by shear force due to inflow speed and tube friction, as well as interruption by screening, bubbles and contaminants. Since errors happen frequently because of these factors, it is necessary to examine and evaluate such errors during the application of a particle counter. Errors can be large due to screening and bubbles. Measurement values are effective for water analysis after filtration process. However, because of screening, only measurement values for particles above $7{\mu}m$ are valid for water with a turbidity between 3-10NTU. As particle numbers around $10{\mu}m$ increase a lot after ozone treatment, sufficient pretreatment process is necessary. Physical conditions should keep stable for inflow to decrease errors caused by shear force.

Development of Particle Detection Chamber for Particle Counter (미세 입자 계수기를 위한 입자 검출 챔버 개발)

  • Ohm, Woo Yong
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.1
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    • pp.219-224
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    • 2014
  • In this paper, we study the scattering characteristics of particle using Mie scattering based on various variables such as particle size and refraction of particle, wavelength of laser and angle of receiver to get diffuse light. And we consist a optical system for particle detection, then analyzed the characteristics of the optical system. And based on these characteristics, we develop a particle detection chamber for particle counter and shows experiment result.

A Study of Response Characteristics and False Counts in Optical Particle Counter (광학 입자 계수기의 응답특성 및 오계수에 관한 연구)

  • 안강호;이재헌
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.3
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    • pp.547-554
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    • 1992
  • Response characteristics and false counts of laser and white light optical particle counters (OPC) have been studied as a function of particle size using monodisperse polystylen laterx (PSL) particles. Theoretical light scattering calculations for He-Ne laser based counter have been compared with the experimental results and thus good agreements have been found. The light scattering intensity in monochromatic light shows an oscillatory character for the transparent and spherical particles of PSL due to Mie resonance. Because of this effect, the response of the LAS-X OPC showed almost same responses in the diameter ranges of 0.4mu.m to 0.6mu.m and 0.7mu.m to 1.0mu.m for PSL particles. A laser optical particle counter with high flow rate applied for clean room has been studied to identify the noise sources. Three different manufacturer's clean room optical particle counters alos have been tested to measure the background noise level.

Evaluation of Biological Activated Carbon Using Particle Counter (입자계수기를 이용한 생물활성탄 공정의 효율평가)

  • Kim, Hee gune;Ryon, Dong choon;Kim, Hyun sil;Ryu, Byung soon;Moon, Seong yong;Kim, Seung Hyun;Kim, Won Kyong
    • Journal of Korean Society of Water and Wastewater
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    • v.20 no.6
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    • pp.823-828
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    • 2006
  • For this study, an online particle counter was installed before and after the activated carbon filtration process of D water treatment plant where has advanced water treatment processes, produces average 900,000ton/day of drinking water and supply the produced drinking water to Busan citizens. We collected and analyzed particle count data for about 1 year. We inspected particle breakthrough in three out of sixteen filter processes operated at same conditions, i.e. 5th filter, 6th filter and 7th filter. According to the monitoring results, 6th and 7th filters showed similar results while 5th filter showed different results. When compared seasonal effect, the particle count for dry season was below 10 particles/ml while the particle count for August when monthly average rainfall is over 200mm was much higher than for dry season. In January and August, there was a difference in breakthrough particle size. In January, small particles in 2~3um were mainly detected while in August 10um particles were mainly detected and the size distribution was 40% of total count.

Spatiotemporal behavior of excited Xe atoms density in Counter discharged type AC-PDP

  • Hong, Young-June;Oh, Phil-Yong;Jeong, Se-Hoon;Hong, Jong-Hwa;Kim, Jung-Hyun;Gyu, Yong;Cho, Seok-Ho;Hong, Sung-Hee;Hong, Byoung-Hee;Choi, Eun-Ha
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08a
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    • pp.574-577
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    • 2007
  • We have measured the excited Xe atoms density in the $1s_5$ metastable states by laser absorption spectroscopy in counter discharged type AC-PDP. This experiment has shown the characteristic of the excited Xe atoms density which is relation to the visible light efficiency of PDP. The density of counter discharged AC-PDP have measured to be $9.47\;{\times}\;10^{13}\;cm{-3}$. The result has been shown to higher value than $1.45\;{\times}\;10^{13}\;cm^{-3}$ of conventional AC-PDP.

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