• Title/Summary/Keyword: Luminous tube

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High Efficient Structure of Plasma Tubes

  • Ishimoto, Manabu;Tokai, Akira;Shinohe, Koji;Awamoto, Kenji;Shinoda, Tsutae
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.103-108
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    • 2004
  • The plasma tube array display is expected to realize the wall size display with very high luminous efficacy. The cell design for high luminous efficacy was investigated. Also discharging in plasma tube was observed to investigate the structure for high luminous efficacy. As the result, high luminous efficacy of 5.4 lm/W was achieved.

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Analysis of Arc Tube Properties by Degradation in Ceramic Metal Halide Lamp

  • Yang, Jong-Kyung;Jang, Hyeok-Jin;Park, Dae-Hee
    • Journal of Electrical Engineering and Technology
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    • v.6 no.1
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    • pp.123-127
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    • 2011
  • To clarify the relations of optical properties to the main factors responsible for the loss and damage of luminous efficacy, a 20 min turn-on/turn-off test for 2,000 h for a ceramic metal halide lamp is conducted. The corrosion rates of the arc tube wall and electrode are estimated based on thermal stress. Wall blackening is attributed to the tungsten being transported from the hot electrode tips to the relatively cold arc tube wall. Furthermore, the grain boundaries of the arc tube are changed by the degradation. Distortion of the electrode is observed, and the ignition and the driving voltage of the load both increase. Finally, the color rendering index and the color coordinates are changed after the degradation. The luminous flux and the intensity of the luminous distribution are decreased significantly.

Optical Properties with Arc Tube Structure of Ceramic Metal-Halide Lamps (세라믹 메탈할라이드 램프의 아크튜브 구조에 따른 광학적 특성)

  • Kim, Woo-Young;Jang, Hyeok-Jin;Yang, Jong-Kyung;Park, Hyung-Jun;Park, Dae-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.378-379
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    • 2009
  • High intensity metal halide discharge lamp performance, specifically the generated luminous flux and light color content, depends critically on the arc tube design. Factors influencing the design and consequent lamp efficacy include : lamp size, geometry, arc tube composition, fill chemistry, electrode design and excitation modes. Shaping of Polycrystalline Alumina(PCA) can be realized by conventional ceramic processes. Several processes are applied nowadays. Well-known in the ceramic high pressure field for decades are the pressing and the extrusion method. Newly developed slurry and precious forming technologies give the one-body seamless tubes, which improve thickness uniformity and lighting performance. Now, we reported some optical properties with different arc tube structures of ceramic metal halide lamps.

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Construction of a Distribution Photometer System for Automobile Light Sources (자동차용 광원의 광도분포 측정장치(배광측정기)제작)

  • 김용완;김홍기;이인원;이완순;이상원
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.10 no.4
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    • pp.53-61
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    • 1996
  • A distribution photometer was constructed to measure the angular distribution of luminous intensity of light sources and the reflected luminance of retroreflectors. This system incorporates a goniometer to rotate test light source(360 degree in yaw rotation and $\pm$30 degree in pictch rotation), a photomultiplier tube as light detector, light projector for retroreflection measurements, and the control and display unit. The ranges of luminous Intensity measurements and observation angles are 0.01~199900 cd and 0.2~1.5 degree respectively. The uncertainty of luminous intensity measurements is $\pm$3%. This paper describes the construction of the distribution photometer and the performance characteristics.

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Manufacturing Process of Self-Luminous Glass Tube (SLGT) Utilizing Tritium Gas (I) (삼중수소 활용을 위한 자발광유리관 (SLGT) 제조기술)

  • Kim Kwangsin;Kim Kyeongsook;Chung Eun-Su;Son Soon Hwan;Nam Gi-Jung
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2005.11a
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    • pp.87-95
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    • 2005
  • Laser sealing/cutting technique, one of the 4 core technologies to manufacture self-luminous glass tubes (SLGTs) has been developed. Through the analysis of commercial products it is found that Pyrex Is used for SLGTs. A CO2 laser, which is commonly used for glass work was used for the study The factors affecting the sealing/cutting were laser intensity, duration. Irradiation method, and pressure inside the tube. The whole Process is composed of 2 stages. In the first stage. both ends of the tubes are sealed while tritium is insected in the tubes. And the tritium sealed tubes are cut in the desired size in the second stage. Defocused beam was used for seal ing and focused beam was used for cutting. After the sealing/cutting, the tubes were heat treated to prevent fracture due to the residual heat stress.

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Investigation of Changeable Discharge colour Controlled by Electronic Circuit (전자적 제어에 의한 가변색방전의 개발에 관한 연구)

  • 오철한;박덕규
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.32 no.5
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    • pp.164-169
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    • 1983
  • A method to control the luminous colour of a gaseous discharge tube has been investigated by using the saw-tooth wave of which rise-time was controlled by an electronic circuit. The luminous colour of a Ne - Hg lamp was changed from red to blue continuously and vice versa, and it's luminous characteristics are as follows: (a) With D.C. potentials, it showed blue colour and the relative intensity of the colour is increased first and saturated at about 17 mA as the discharge current is increased. (b) When the rise-time of the saw-tooth wave is about 10 $\mu\textrm{s}$, the red colour which is caused by Ne - excitation is dominant, and when about 200 $\mu\textrm{s}$, only the blue colour which is caused by Hg - excitation is shown. (c) With saw-tooth pulse, the relative intensity of blue is increased similarly as that with D.C. potential as the current peak of each pulse is increased, while that of red is increasing continuously and it's intensity shows about twice than blue. (d) The spectrum of red colour contains Ne - excitation lines and Hg - blue lines, but the apparent luminous colour is red because Ne - red lines are more plenty than Hg-blue lines. The spectrum of blue colour presents only Hg-blre lines.

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Optical Properties with Arc Tube Structure of Ceramic Metal Halide lamps (세라믹 메탈할라이드 램프 아크튜브 구조에 따른 광학적 특성)

  • Lee, Joo-Hoo;Yang, Jong-Kyung;Kim, Nam-Goon;Jang, Hyeok-Jin;Park, Dae-Hee
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.12
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    • pp.2244-2248
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    • 2008
  • High intensity metal halide discharge lamp performance, specifically the generated luminous flux and light color content, depends critically on the arc tube design. Factors influencing the design and consequent lamp efficacy include : lamp size, geometry, arc tube composition, fill chemistry, electrode design and excitation modes. Shaping of Polycrystalline Alumina(PCA) can be realized by conventional ceramic processes. Several processes are applied nowadays. Well-known in the ceramic high pressure field for decades are the pressing and the extrusion method. Newly developed slurry and precious forming technologies give the one-body seamless tubes, which improve thickness uniformity and lighting performance. Now, we reported some optical properties with different arc tube structures of ceramic metal halide lamps.

A Study on Color Control in Gas Discharge Tube with the Variation of Frequency (주파수 변화에 따라 기체 방전관 색상 제어에 관한 연구)

  • Lee, Jong-Chan;Park, Dae-Hee
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 1996.11a
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    • pp.53-56
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    • 1996
  • In this paper, the pulsed mode operated gas discharge tube is composed with mixed gas of Hg-Ne (10 Torr), in the tube of 15.0 mm outer diameter and has variable color from red to blue with changing frequency high voltage. As increasing frequency in the gas discharge tube, the phenomena, that the electron temperature in the positive column increases and the radiation from atoms of higher upper state energy levels increases, exist The color have the locus from red (0.4972, 0.3128) to blue (0.2736, 0.2619) in CIE chromacity diagram with increasing frequency. The method of changing frequency has been shown to be suitable for the luminous color control.

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Cause Investigation and Verification of Fire Accidents for Road and Street Lighting (가로등 화재사고의 원인규명과 검증)

  • Shong, Kil-Mok;Han, Woon-Ki;Kim, Jong-Min;Kim, Young-Seok;Kim, Myoung-Soo;Kim, Hyeok-Soo
    • Journal of Korean Institute of Fire Investigation
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    • v.11 no.1
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    • pp.31-36
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    • 2008
  • This paper carried out a variety of analysis for a finding out the causes of fire on the street lamp. The glass bulb of 250W metal-halide(MH) lamps attached with the impurities rose the temperature by at $410.4^{\circ}$ in normal condition. Therefore, a lamp apparatus is needed the improvement for ventilation and the protection against dust. The heat of MH lamps is diffused through out the luminous tube, a glass bulb, and apparatus by degrees. The accident cause of the lamp is presumed that the accumulated heat by deposits of the inner part. It will be recommended the improvement of the structure that aren't the external impurity and accumulated heat in the MH lamps set.

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