• 제목/요약/키워드: Light output

검색결과 895건 처리시간 0.031초

수직 외벽면 적용 BIPV의 Mock-up 실험연구 (A Study on the Mock-up test for applying BIPV in the external curtain Wall)

  • 이한명;오민석;김회서
    • 한국태양에너지학회 논문집
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    • 제29권6호
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    • pp.110-118
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    • 2009
  • This research is an experimental study on BIPV Power performance of See-through a-si and Light-through applying external curtain wall. In case of See-through a-si Photovoltaic, appropriateness of facade applying standard($950\;{\times}\;980mm$) large($950\;{\times}\;1960mm$)area photovoltaic was examined. Transparent performance was also investigated through Power simulation according to angles and seasons of See-through a-si and Light-through Photovoltaic so that Power output was surveyed with using designed and manufactured Mock-up. When comparing See-through a-si to Light-through Photovoltaic for simulation Power output on angles based on full south aspect, which the result was that See-through a-si Power output according to Light-through Power output was the highest of 65.5% when applying a 90 degree angle. Monthly accumulated average Power output during winter seasons (December, January and February) applying a vertical plane on full south aspect was analyzed, which results in 66.37W/h of See-through a-si and 139.1 W/h of Light-through. See-through a-si Power output showed 47.7% in comparison with Light-through transparent. Also monthly, hourly average Power efficiency according to solar radiation during winter seasons (December, January and February) was that 4.7% of See-Through a-si and 9.8% of Light-through.

데이타 포밍방식에 의한 Intense Pulsed Light의 객체처리 (Intense Pulsed Light object processing in compliance with a data forming method)

  • 김휘영
    • 디지털산업정보학회논문지
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    • 제5권4호
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    • pp.1-9
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    • 2009
  • It establishes the nonlinear optics material recently on solid-state laser output side and from the infrared ray until is early has in the ultraviolet rays and the wavelength of broadband there makes be a possibility of getting the laser light which and in processing and measuring field it is widely used. Consequently, it used the pulse reiteration law from origination and nine as the fundamental wave direct plan it produced. intense it affixed the nonlinear optics material (KTP) in pulsed light and it got the green light. When inflicting a same energy in respectively reiteration mesh, intense interrelation of pulse light output and green light output between. It analyzed the conversion ratio which it follows in the mesh.

광파이버 일루미네이터의 2층구조형 LED 집광판 설계 (Design of a Light Collector with Two-story LED Mounting Holder for a Fiber-optic Illuminator)

  • 김완호;박준석;여인선
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 추계학술대회 논문집 전기물성,응용부문
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    • pp.255-258
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    • 2001
  • This paper proposes a new structure of a fiber-optic illuminator using high Lux RGB LEDs. A simulation program, LightTools, is used for the verification of the model. An LED mounting holder containing 74 RGB LEDs is used as a basic part of its light collector. Since the light output level of current LED lamps is still far below that of conventional lamps, it is required to double the right output in order to replace a conventional illuminator with a halogen lamp. An additional cone-type reflector is installed hemispherically and the resulting structure comprises a basic collector unit. To further increase the output two collector units are connected together in series. As the result, the light output increases nearly 70% with compared to a collector with a basic structure. The system efficiency can be increased more than 8 times with compared to conventional one.

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ZnO 나노로드 배열에 의한 GaN기반 광다이오드의 광추출율 향상 (Improved Light Output of GaN-Based Light-Emitting Diodes with ZnO Nanorod Arrays)

  • 이삼동;김경국;박재철;김상우
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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    • pp.59-60
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    • 2008
  • GaN-based light-emitting diodes (LEDs) with ZnO nanorod arrays on a planar indium tin oxide (ITO) transparent electrode were demonstrated. ZnO nanorods were grown into aqueous solution at low temperature of $90^{\circ}C$. Under 20 mA current injection, the light output efficiency of the LED with ZnO nanorod arrays on ITO was remarkably increased by about 40 % of magnitude compared to the conventional LED with only planar ITO. The enhancement of light output by the ZnO nanorod arrays is due to the formation of side walls and a rough surface resulting in multiple photon scattering at the LED surface.

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Performance Improvement of Flashlamp-Pumped Ti: sapphire Laser

  • Xia, Jinan;Lee, Min-Hee;Eur, Jeong-Pil
    • Journal of the Optical Society of Korea
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    • 제6권2호
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    • pp.48-54
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    • 2002
  • Experimental study is performed on flashlamp-pumped Ti: sapphire lasers with single, double, and four-partial-ellipse-pump cavities aiming at improving the performance of the lasers. The output energy of 604 mJ per pulse with a width of 25 $\mu$s at a total laser efficiency of 0.13% is achieved in the laser pumped by a light pulse of 45$\mu$s without a fluorescent converter The laser output energy versus its Ti: sappy ire rod length, pumping-light pulse duration, and electrical input energy are discussed with or without using a fluorescent converter. The result shows that much more output energy is obtained il a longer Ti: sapphire-rod laser pumped by a shorter light pulse when its output coupler has an optimized transmittance. In addition, an enhancement of output energy by a factor of 7 is achieved. in the laser using a fluorescent converter LD490.

질화갈륨계 발광소자 봉지재의 굴절률 및 곡률 변화에 따른 광 출력 특성 연구 (A study of light output characteristics with various refractive indices and geometrical structures of the GaN based light-emitting device encapsulants)

  • 김형진;유진열;강영래;김재필;곽준섭
    • 조명전기설비학회논문지
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    • 제26권7호
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    • pp.1-8
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    • 2012
  • In this paper, we improved the light extraction efficiency by structural change of LEDs on conventional LEDs. We simulated the LEDs light emission as functions of LED side wall angle, various refractive indices the geometrical structures and analyzed the condition improved the light efficiency. We present the results of experimerns and simulations for light output power from LEDs for various refractive indices and the geometrical structures of the LED encapsulants. When the side wall angle range was from 40[$^{\circ}$] to 30[$^{\circ}$], the LED emission increased. LED side wall angle onto LED using the simulation system with a fine tuning of the structure of the LEDs side wall angle is fabricated. Additionally, we changed the side wall angle of LED package with spherical structure and flat structure. The result of spherical structure ray tracting is higher compared with flat structure about 14[%].

소규모 사무실에 적용된 조광제어 시스템의 최적제어를 위한 주광변화 분석 (Analyses on Daylight Variations for Optimum Controls of Daylight Dimming Systems in a Small Office)

  • 윤연주;백용규;김수영
    • 설비공학논문집
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    • 제24권5호
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    • pp.433-442
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    • 2012
  • The influence of outdoor sky conditions on photosensor signals were examined to determine an appropriate index that is effectively used for optimum illuminance fluctuation when a daylight dimming system is used for a small office. Field measurements were conducted under various sky conditions. Results indicate that the outdoor global and vertical illuminance fluctuated within narrow ranges under clear and overcast sky conditions. The fluctuation of sky ratio under partly-cloudy sky caused wide ranges of illumnance fluctuation. A partially-shielded photosensor at backwall produced 56% of light output from fixtures controlled by a photosensor at ceiling. This implies that the photosensor at backwall does not always guarantee target illuminance due to the less output. The fluctuation of light output from fixtures were insignificant under clear and overcast sky. The fluctuation range of photosensor illuminance under partly-cloudy sky caused wide fluctuation ranges of light output. Regression result implies that the outdoor vertical illuminance was recommended for an effective index that is used for control of light output.

Analysis of Polarization Properties of Optical Isolator for Fiber Laser

  • Kim, Tae-Gon;Cheon, Min-Woo;Park, Yong-Pil;Cho, Kyung-Jae;Kang, Sung-Hak
    • Transactions on Electrical and Electronic Materials
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    • 제12권6호
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    • pp.241-244
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    • 2011
  • An isolator transmits light in the forward direction and blocks light from passing in the reverse direction. It is regarded an essential optical component in medical, industrial, and research lasers for blocking reflection beams that cause optical damage and noise. It is also used as a communicative light intensifier to expand the lifespan of devices and enhance transmission quality. This study analyzed the characteristics of the core components in the construction of a polarization-independent isolator, namely, the walk-off polarizer and the Faraday rotator. Measurement of the extinction ratio of the resultant walk-off polarizer revealed that the ratio between the vertical and horizontal rays was 1,050:1 with a laser output of 0.032 W and 1,010:1 with a laser output of 2.68 W, thus presenting ratios similar to 1,000:1. In addition, the walk-off polarizer and Faraday rotator constructed in this study were used to compare output changes according to changes in power of input light and to check the penetration ratio. Results from the study presented variations in output value according to changes in power of input light. However, the average penetration ratio remained relatively consistent (~81.4%).

유리도광체를 이용한 평판조명용 광확산패턴의 최적설계 연구 (Study of Optimal Light Scattering Pattern Design for Flat Lighting Device using Glass Light Guide)

  • 한정민;김원배
    • 전기학회논문지P
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    • 제66권4호
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    • pp.242-246
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    • 2017
  • In this study, it was investigated about optical simulation in high brightness and high uniformity general lighting using glass light guide plate. And we adopt edge-light emission type light plate. Edge-light type lighting has been used LCD application, especially note PC or smart phone backlight unit. Because it had the good properties such as slim shape and light weight. We thought this type was suitable for general lighting application such as wall attached type or ceiling mount type. But many of edge-light type lighting had problems. It called slanted output light rays. That was main key parameter how could control the direction of output light rays. We investigated the solution of this problems, using ray tracing method, we recognized the major fact of the solution relied on the geometric structure of diffusing dot shape. We set the conditions of aspect ratio in diffusing dot shape such as 0.5 to 1. And, at first, we designed diffusing dots shape based on the results of optical simulation and made specimen. as above condition, and acquired good result in confirming dots shape such as the value of the output rays's peak angle was around 75 degrees. And good light distribution characteristics were measured by slated spectro-radiometer. It was shown that the effective ways of designing light distribution characteristics using optical simulation such as ray tracing linear method for making general lighting using glass light guide plate.

InGaN/Sapphire LED에서 기판 제거 유무와 칩 마운트 타입이 광출력 특성에 미치는 영향 (Analysis of the Effect of the Substrate Removal and Chip-Mount Type on Light Output Characteristics in InGaN/Sapphire LEDs)

  • 홍대운;유재근;김종만;윤명중;이성재
    • 한국광학회지
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    • 제19권5호
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    • pp.381-385
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    • 2008
  • InGaN/Sapphire LED에서 기판 제거와 패키지 방식이 광출력 특성에 미치는 영향을 분석하였다. Sapphire 기판의 제거는 반도체 접합에서 발생된 열의 방출에 도움이 되지만, 반대로 광추출효율이 손상되는 문제점이 수반된다. Sapphire 기판이 제거된 칩을 열전도율이 좋은 금속의 마운트 위에 부착하면, 최대 구동전류는 현저히 증가하고 광출력도 상당히 증가됨으로써, 광추출효율이 손상되는 문제점이 어느 정도 보상된다. 하지만, sapphire 기판이 제거된 칩을 상대적으로 열전도율이 낮은 유전체의 마운트 위에 부착하는 경우에는, 거의 모든 입력전류 범위에서 sapphire 기판이 남아 있는 일반형 칩보다 낮은 광출력을 나타낸다. 따라서, 작은 광출력이 요구되는 응용분야에서는 사용된 칩 마운트의 종류에 무관하게, 일반형 칩이 sapphire 기판이 제거된 칩 보다 유리한 것으로 분석된다.