• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.8
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• pp.94-101
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• 2005

The silent discharge type ozonizer with three electrodes(central electrode, internal electrode, and external electrode) and one discharge gap(discharge gap between internal electrode and external electrode) has been designed and manufactured. It is a silent discharge type ozonizer for which the AC high frequency voltages applied to the central electrode within vacuum discharge tube and the internal electrode for which the external electrode is a ground Ozone is generated by silent discharge in discharge gap. At the moment, discharge characteristics and ozone generation characteristics were investigated in accordance with vacuum of discharge tube, frequency of AC power source, discharge power of ozonizer, and quantity of supplied oxygen gas. In consequence, ozone characteristics proportional to vacuum of discharge tube and frequency of AC power source. The maximum value of ozone can be obtained 7,700[ppm], 460[mg/h] and 70[g/kwh].

• Korean Journal of Optics and Photonics
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• v.3 no.3
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• pp.178-182
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• 1992

An air-cooled discharge-heated copper-vapor laser system with its inter-electrode distance of 45 cm has been developed by utilizing an alumina ceramic plasma tube of 1.6 cm in diameter and 50 cm in lengih. For operating the laser, a dc high voltage power supply with output rating of 6 kV and 500 mA, a resonant charging circuitry consisting partly of an 1.8 H inductor assembly and a 5 nF storage capacitor, and a thyratron driver operating up to 7 kHz have also been developed. The present laser system starts lasing at the tube temperature of about $1350^{\circ}C$ and an maximum average output power of 0.7 W has been obtained at 12 kV, 4.5 kHz. 50 mbar of Ne buffer gas pressure, and at the tube temperature of $1460^{\circ}C$.

• Proceedings of the KIEE Conference
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• 2001.07c
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• pp.1626-1628
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• 2001

본 연구는 AC 전원을 인가하여 좁은 전 극간격에서 고수율을 얻을 수 있는 연면방전방식 (Surface Discharge type)과 DC 전원을 인가하여 넓은 전극간격에서 저수율을 가지는 DC방전방식(DC Discharge type)을 중첩방전 할 수 있도록 중첩방전관을 설계 제작하여 각각 독립적인 방전방식을 적용하였을 때의 방전전압, 방전전류, 방전전력 및 오존생성농도를 실험적으로 조사하고, 두 방전방식을 동일공간에 중첩방전하여, 위 실험을 반복하고 중첩방전이 동일방전공간에 투입에너지 밀도를 높임으로써 방전특성 및 오존생성 특성을 비교 분석하였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.4
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• pp.107-113
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• 2008

We investigated the electro-optical characteristics of an ICP(Inductively Coupled Plasma) light source depending on driving temperature, and length of discharge tube. An electro-optical stability of a sample at operating was measured to see a steady state of a sample. In this results, we can see that a stability of power loss and luminous flux of a sample at operating of upper 70[min] was 1.45[%1 and 0.36[%]. We measured the optical characteristics of a sample in a thermal chamber operated at a specific temperature divided into 5 steps. While luminance increased with temperature increasing, the decrement of luminance a eared at u or $46.7[^{\circ}C]$. According to Parchen's and Boyle-Charles' law, we can speculate that a pressure was increased and a higher voltage was needed but a ballaster having a rating power can't support a higher voltage corresponding to a pressure change, 0.02[Torr] at $46.7[^{\circ}C]$. Moreover, we measured an a lied power and current of samples depending to a various length of a discharge tube.

• Korean Journal of Optics and Photonics
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• v.1 no.1
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• pp.28-32
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• 1990

We have constructed and operated a discharge heated copper vapor laser which generated green (510.6 nm) and yellow (578.2 nm) light. The plasma tube was made of high purity (99.8%) alumina tube which has an inner diameter 25 mm and a length 106 cm. The electrodes, made of molybdenum sheet, were separated 108 cm apart. The laser gave an average power of 10 W at repetition rate of 5 kHz, charging voltage of 10 kV, Ne buffer gas pressure of 40 mbar, and the laser tube temperature of $1500^{\circ}C$..

• Journal of the Korean Vacuum Society
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• v.22 no.3
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• pp.111-118
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• 2013

The influence of gas flow on the plasma generation in the atmospheric plasma jet is described with the theory of hydrodynamics. The plasma discharge is affected by the gas-flow streams with Reynolds number (Re) as well as the gas pressure with Bernoulli's theorem according to the gas flow rate inserted into the glass tube. The length of plasma column is varied with the flow types such as the laminar flow of Re<2,000 and the turbulent flow of Re>4,000 as it has been known in a general fluid experiments. In the laminar flow, the plasma column length is increased as the increase of flow rate. Since the pressure in the glass tube becomes low as the increase of flow velocity by the Bernoulli's theorem, the breakdown voltage of plasma discharge is reduced by the Paschen's law. Therefore, the plasma length is increased as the increasing flow rate with the fixed operation voltage. In the transition of laminar and turbulent flows, the plasma length is decreased. When the flow becomes turbulent as the flow rate is increasing, the plasma length becomes short and the discharge is shut down ultimately. In the discharge of laminar flow, the diameter of plasma beam exposed on the substrate surface is kept less than the glass diameter, since the gas flow is kept to the distinct distance from the nozzle of glass tube.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1493-1494
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• 2008

최근 메탈할라이드 램프에서 방전관 재료에 세라믹을 사용하는 세라믹 메탈할라이드 램프가 고연색성과 고효율, 장수명 등의 장점에 을 가지고 있다. 최근 이러한 세라믹 메탈할라이드 램프의 적용이 증가함에 따라 개선을 위하여 계속적으로 방전관 재료, 가스 및 메탈할라이드의 최적화, 구동방식에 따른 특성 등 다양한 요소에 대한 연구가 진행되고 있다. 본 논문은 이러한 세라믹 메탈할라이드의 구동방식에 따른 특성을 알아보기 위하여 자기식 안정기와 전자식 안정기의 구동 시 나타나는 전압, 전류 파형과 광학적 특성, 열적특성을 비교 분석하였다.

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.100-101
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• 2000

최근에 100Hz 이하의 펄스 반복율을 가지는 20 W급 출력의 의료용 및 마킹용 펄스 $CO_2$레이저의 수요가 증가함에 따라 유지와 보수의 편리성은 물론 사용자의 편의성을 충족시키기 위한 레이저 전원장치의 소형화, 출력 제어의 용이성 및 저가격화 등에 대한 요구가 증대되고 있다. 기존의 펄스형 $CO_2$레이저의 전원장치는 원하는 펄스 반복율에 맞도록 스위칭 소자를 "on"-"off"하여 콘덴서에 충전된 에너지를 고압 펄스 트랜스를 통해서 레이저 방전관에 인가하는 방식이다. 즉 DC를 스위칭 과정을 통해 펄스 에너지로 변환시킨 후 방전관에 그 펄스에너지를 공급하는 형태이다$^{(1)}$ . (중략)

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.334-334
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• 2011

본 연구는 바늘 형 전극을 가진 대기압 방전 Plasma jet에서 Capacitor 값의 변화를 주어 방전 전압-전류 특성을 찾고자 한다. 유리관 내부의 주사기 바늘에 교류 고전압을 인가하였고, inverter와 고전압 전극 사이에 5.0 pF, 7.5 pF, 13.5 pF, 27.0 pF 다섯 가지의 Capacitor를 연결하였다. 작은 Capacitor 값을 연결했을 때, 방전 개시 전압이 낮았다. 또한, 같은 구조의 Plasma jet를 알루미늄 판에 조사하여 전압과 전류의 변화를 알아보았다. 유리관 밖으로 방출되는 플라즈마 제트를 알루미늄 판에 조사했을 때, Output Voltage와 Output Current가 감소하는 경향을 보였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.10
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• pp.94-99
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• 2006

Ozone concentration and flow rate of discharge tube were measured using LabVIEW program in data acquisition part and it was saved. In addition, quantities of ozone generation was adjusted by the collected data, which was performed at control part. Therefore, energy efficiency was improved by suppling quantities of ozone generation according to environmental conditions.