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Electrodelss Plasma Torch Powered by Microwave and Its Applications
홍용철(Hong, Yong-Cheol),전형원(Jun, Hyung-Won),노태협(Lho, Tai-Hyeop),이봉주(Lee, Bong-Ju),엄환섭(Uhm, Han-Sup) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
A microwave plasma torch at the atmospheric pressure by making use of magnetrons operated at the 2.45 GHz and used in a home microwave oven has been developed. This electrodeless torch can be used to various areas, including industrial, environmental and military applications. Although the microwave plasma torch has many applications, we in the present work focused on the microwave plasma torch operated in pure steam and several applications, which may be used in future and right now. For example, a high-temperature steam microwave plasma torch may have a potential application of the hydrocarbon fuel reforming at one atmospheric pressure. Moreover, the radicals including hydrogen, oxygen and hydroxide molecules are abundantly available in the steam torch, dramatically enhancing the reaction speed. Also, the microwave plasma torch can be used as a high-temperature, large-volume plasma burner by injecting hydrocarbon fuels in gas, liquid, and solid into the plasma flame. Lastly, we briefly report an underway research, which is remediation of soils contaminated with oils, volatile organic compounds, heavy metals, etc.
다양한 전기탐침을 이용한 RF 플라즈마 전자온도의 측정
서영준(Y.-J Seo),우현종(H.-J. Woo),최근식,유현종(H.-J. You),노태협(T. Lho),정규선(K.-S. Chung) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
An electric probe is a conductor inserted into the plasma, by which plasma density and electron temperature can be deduced from the collected current (Ⅰ) versus applied voltage (Ⅴ) to the probe. In RF plasma the Ⅰ-Ⅴ characteristics of electric probe is distorted due to the RF fluctuation of plasma potential, so that it is hard to measure the real plasma parameters, especially the electron temperature. To eliminate the RF fluctuation, several compensation methods are developed such as RF compensation probe, peak-to-peak method, asymmetric double probe. By comparing proposed methods, a suitable method is to be introduced in determining electron temperatures in RF plasma.
유승민 ( Seung Min Ryu ),유승열 ( Seung Ryul Yoo ),박준석 ( Jun Seuk Park ),홍은정 ( Eun Jung Hong ),노태협 ( Tai Hyeop Lho ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.5
Chloroform is harmful volatile organics and representatives of Trihalomethane (THM). Well-known removal methods of Chloroform are photo oxidation or OH radical oxidation. Plasma on water surface at slightly vacuum condition (45 torr) can produce OH radical and it will help chloroform removal. 81.5% of chloroform is removed by vacuum and plasma in 10 min. Plasma can totally oxidize it till 2.8% and partially oxidize chloroform up to 18.5%. Water-surface plasma is good method to remove chloroform in short time.
홍은정 ( Eun Jung Hong ),정팔진 ( Paul Gene Chung ),유승민 ( Seung Min Ryu ),박준석 ( Jun Seuk Park ),유승열 ( Seung Ryul Yoo ),노태협 ( Tai Hyeop Lho ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.3
A flotation process has a shorter processing time and needs less space than a sedimentation process. Dissolved air flotation process (DAF) is an efficient flotation method and used in a conventional wastewater treatment process. However, DAF requires the circulation of water containing compressed air and requires expensive installation and operation cost. Plasma Air Flotation (PAF) process is able to float flocs by micro bubbles generated from underwater plasma without the circulation of bubbly water and additional saturators. Therefore, PAF can be an alternative solution overcoming economic barriers. In this study, Humic acid removal efficiency by PAF process was compared with that of sedimentation process. 44.67% and 87.3% reduction rate based on UV 254 absorbance has been measured in sedimentation and PAF respectively. In particular, PAF in the flocculation zone can dramatically remove humic acid from water. In flocculation zone, PAF can separate organic matters but sedimentation cannot.
안테나 형태에 따른 대면적 ICP 플라즈마의 균일도 면화에 관한 연구
최영도,노태협,김곤호 한양대학교 이학기술연구소 2001 이학기술연구지 Vol.3 No.-
대면적 균일 ICP 플라즈마를 발생시킬 수 있는 IPC용 안테나 개발을 위하여 안테나 구조와 안테나에 흐르는 전류 방향에 따른 발생 플라즈마의 특성을 Langmuir 탐침과 자기 탐침을 이용하여 관찰하였다. 안테나의 구조가 내부 안테나와 외부 안테나로 이루어진 두 안테나에 흐르는 전류방향이 반대 방향일 때는 같은 방향일 때보다 플라즈마 밀도 균일도가 향상되는 경향을 가졌다. 직경 300mm에서의 플라즈마 균일도가 2~3%를 나타내었다. 이 결과를 이용하여 Super Flat Antenna(SFA)를 개발하였다. This paper presents effects of antenna shape and current direction on plasma density uniformity for a large area uniform ICP plasma parameters. The antennae were composed of a rectangular inner and outer antenna. When the current direction along the antenna was opposite, plasma uniformity was improved in compare with the same current direction along the antenna. The optimized antenna can generate the uniform plasma within 2-3% uniformity in 300mm diameter and is called Super Flat Antenna (SFA).
약한 외부자장에 의한 유도결합형 플라즈마에서의 Helicon wave발생에 관한 연구
김상진,노태협,김곤호 한양대학교 이학기술연구소 2001 이학기술연구지 Vol.3 No.-
본 연구에서는 대면적 금속반응기에 I3.56MHz RF 전력을 인가하여 ICP(Inductively Coupled Plasma)를 발생하고, 외부에 약한 자기장(B<70G)을 인가하였을 때 플라즈마 내부에서 helicon wave의 전파현상을 관찰하였다. 기존의 ICP에 사용되는 안테나와 달리 직경이 서로 다른 두 개의 1turn 안테나를 직렬연결하여 안테나의 내부와 외부에 흐르는 전류의 방향을 반대가 되도록 하였다. 안테나에 의해 유도되는 자기장의 시간에 따른 변화량( ∂B/ ∂t)을 자기탐침을 이용하여 측정하였으며 유도되는 자기장의 θ방향성분을 측정하여 비대칭성을 갖는 m =1 mode임을 확인하였다. 발생된 플라즈마의 밀도는 Langmuir탐침을 이용하여 측정하였고, 측정된 밀도는 2.4 X 10^(10)cm^(-3) ~ 2.25 X 10^(11)cm^(-3) 이었다. 측정한 밀도와 외부에 주어진 자기장을 dispersion relation에 대입하여 계산된 wave number와 자기탐침을 이용하여 측정한 wave number를 비교하여 전파된 wave가 helicon wave 와 일치함을 확인하였다. This study was on the helicon wave propagation in an ICP(Inductively Coupled Plasma), which was generated by I3.56MHz RF power in a large area metal chamber with low external B-field(B<70G). Unlike a usual antenna for ICP, two different diameter I-turn antenna was connected in serial to opposing a current flowing the inner and the outer antenna. Time dependent B-Field( ∂B/ ∂t ), induced by the antenna was measured by a magnetic probe. It was confirmed m=I mode wave propagation by measuring θ component of the induced B-field. Plasma density was measured by Langmuir probe. It was 2.4 X 10^(10)cm^(-3) ~ 2.25 X 10^(11)cm^(-3)? By comparing a wavenumber which is calculated from the measured density and external B-field to a wavenumber measured by the magnetic probe, the helicon wave propagation has been confirmed.