• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.2
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• pp.369-372
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• 2009

When measuring the luminous flux of a light source at the integrating sphere photometer, it can know the luminous flux to compare the standard lamp with the specimen lamp at the same location. But in case of PLS(plasma lighting system, microwave discharged lamp), that two lamps are cannot be the same location. If the reference illuminant and specimen lamp are cannot measure identical location, we should measure the variation of the luminous flux. For the outcome we can turn out a correction factor to revise and reflect it. But the better way is calibrate the specimen lamp locate the identical location of reference illuminant measured. In this thesis, we've test to find the correction factor for consider that change the measuring location. And it turns out the correction factor. From this, it presents the result to make a select for the reference illuminant which is against the illuminant type for newly produce.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.49 no.11
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• pp.609-615
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• 2000

A prototype electrodeless sulfur lamp was developed and investigated the spectroscopic characteristics. The emission spectra of $S_2$ in the microwave-discharged eletrodeless sulfur lamp (ESL) were studied at various input power. The emission spectra of the ESL shift to longer wavelength with increasing of the input power. We have shown that this is due to the self reversal effect in the high pressure gas discharge. We also show that the self reversal effect increases as the rotation of the discharged bulb. The spectral distribution of the ESL shifts about 45 nm toward visible region from UV region due to the rotation of the lamp bulb.

• Proceedings of the Optical Society of Korea Conference
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• 1998.08a
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• pp.138-139
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• 1998

• Proceedings of the KIEE Conference
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• 1999.07e
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• pp.2025-2027
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• 1999

최근 10여 년간 고광도 방전등 기술은 많은 발전이 있었다. 특히 마이크로파로 방전하는 무전극 황 방전등 (Microwave discharged electrodeless sulfur lamp)은 1990년대 초반 Fusion lighting에 의해 소개된 이후 많은 발전을 거듭하여 왔다. 마이크로 파 방전 무전극 황전등은 마그네트론에서 발생된 2.45 GHz의 마이크로파로 여기된 이원자 황으로부터 방출되는 빛을 조명에 사용한다. 전극이 없어 방전시 전극에 의한 전구의 손상이 없으므로 전구 자체의 수명은 반영구적이다. 이원자 황에서 방출된 빛은 가시광선 영역에서 연속적인 분광분포를 가지며 발광 효율은 100 lumen/W 이상으로 매우 높다. 본 논문에서는 전력연 구원에서 국내 최초로 제작한 마이크로파 방전형 무전극 황전등의 전반적인 특성을 소개한다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1998.11a
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• pp.17-20
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• 1998

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.11a
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• pp.492-494
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• 2002

The fundamental principles of the operation of microwave discharges that are used to convert microwave energy to broad spectrum visual light are known. In this paper, emission dependance of microwave discharges in mixture content of sulfur with noble gases was studied. It is shown that the excitation of this gaseous mixture is carried out in two phases: (1) ionization of noble gas atoms by a microwave field and (2) the consequent maintenance of slightly ionized nonequilibrium plasma by the field. These two processes have essentially various thresholds for the microwave pump. The purpose of this work is to investigate spectral properties of the high frequency discharges in a mixture sulfur vapors with noble gases.

• Proceedings of the KIEE Conference
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• 2004.11a
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• pp.293-295
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• 2004

PLS(Plasma Light System) is one of the electrodeless lamp discharged by micro wave. In this new lamp has high efficacy and CRI(Color Rendering Index). It is mainly composed of microwave part and optical part. Microwave parts consist of magnetron, wave-guide and cavity-mesh, while optical parts consist of bulb, mirror and reflector. In this paper, we studied experimentally the heat-resistance and temperature distribution characteristics of bulb in PLS.

• Korean Chemical Engineering Research
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• v.46 no.6
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• pp.1063-1068
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• 2008

The photocatalytic degradation of methylene blue water solution was carried out by irradiating microwave and UV light simultaneously using $TiO_2$ photocatalyst balls prepared by Chemical Vapor Deposition method. A microwave-discharged electrodeless UV lamp was developed to use microwave and UV simultaneously for photocatalytic reactions. The results of photocatalytic degradation of methylene blue showed that the decomposition rate increased with the microwave intensity, the circulating fluid velocity and auxiliary oxidizing agents added. Especially, the rate constant of $H_2O_2$-added photocatalytic reaction increased about three times from $0.0061min^{-1}$ to $0.0197min^{-1}$ when microwave was additionally irradiated. This study demonstrates that the microwave irradiation can play a very important role in photocatalytic degradation using peroxides although it is not easy to quantitatively assess the effect of microwave on photocatalytic reactions from the experimental data of this study.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.8
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• pp.817-822
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• 2008

In this study, the photocatalytic degradation of methylene blue in TiO$_2$ particles-dispersed water solution was carried out by irradiating microwave and UV light simultaneously. A microwave-discharged electrodeless UV lamp was developed to use microwave and UV simultaneously for photocatalytic reactions. The results of photocatalytic degradation of methylene blue showed that the decomposition rate increased with the microwave intensity, the circulating fluid velocity, and the amount of TiO$_2$ particles and auxiliary oxidizing agents added. Especially, the rate constant of H$_2$O$_2$-added photocatalytic reaction increased about three times from 0.0075 min$^{-1}$ to 0.0250 min$^{-1}$ when microwave was additionally irradiated. This study demonstrates that the microwave irradiation can play a very important role in photocatalytic degradation using peroxides although it is not easy to quantitatively assess the effect of microwave on photocatalytic reactions from the experimental data of this study.