New Physics: Sae Mulli (새물리)

Korean Physical Society (한국물리학회)
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Design of an Optical System for a Medium Luminous-Intensity Aircraft-Warning Light Using a LED Light Source and a Fresnel Lens

LED 광원과 프레넬 렌즈를 이용한 중광도 항공장애등 광학계 설계

  • Park, Hyeon Joon (Department of LED Convergence Engineering, Pukyong National University) ;
  • Choi, Seong Won (Department of LED Convergence Engineering and Image Science and Display Engineering, Pukyong National University) ;
  • Kim, Jong Tae (Department of LED Convergence Engineering and Image Science and Display Engineering, Pukyong National University)
  • 박현준 (부경대학교 LED 융합공학과) ;
  • 최성원 (부경대학교 LED 융합공학과, 융합디스플레이공학과) ;
  • 김종태 (부경대학교 LED 융합공학과, 융합디스플레이공학과)
  • Received : 2018.08.29
  • Accepted : 2018.10.17
  • Published : 2018.11.30
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Abstract

Aircraft-warning lights are lights that are used to inform pilots in flight about the presence of buildings or dangerous objects. Currently, the light sources of most aircraft-warning lights have been replaced by light-emitting diodes (LEDs). However, the aircraft-warning lights that are installed do not meet the optical performance standards and may cause airplane collisions. Therefore, the use of such light poses a risk to aviation safety. In order to solve this problem, we designed a Fresnel lens with the same luminous intensity distribution ovef $360^{\circ}$ direction; thus, we collimated the light beam from the LED light source with a narrow beam divergence angle in the form of an array of aspheric pieces. After that, we designed and simulated an aircraft-warning-light optical system with a center luminous intensity of 20,000 cd and a vertical divergence angle of $3^{\circ}$ or more by optimizing the lens' tilt and the distance between the LED and the Fresnel lens.

항공장애등이란 비행 중인 조종사에게 건축물이나 위험물의 존재를 알리기 위해 사용되는 등화를 말한다. 현재 대부분의 항공장애등의 광원은 발광다이오드(light-emitting diode, LED)로 대체되었고, 급격하게 확장 및 보급되었으나, 설치된 항공장애등이 광학적 성능 기준을 충족하지 못하여 항공 수송기기의 충돌 사고를 유발하고 있으며, 이러한 이유로 항공 안전상의 위험에 노출되어 있는 실정이다. 이러한 문제를 해결하기 위하여 본 연구에서는 $360^{\circ}$ 방향에서 동일한 광도 분포를 가지고, LED 광원에서 나오는 광선을 좁은 빔(beam) 발산각으로 시준할 수 있는 프레넬 렌즈(fresnel lens)를 각각의 비구면 조각의 집합 (array) 형태로 설계를 하였다. 그 후에, 렌즈 기울기(tilt), LED와 프레넬 렌즈 사이의 거리를 최적화하여 중심 광도 20,000 cd, $3^{\circ}$ 이상의 수직 빔 발산각을 구현하는 항공장애등 광학계 설계와 시뮬레이션을 진행하였다.

Keywords

Acknowledgement

Supported by : 부경대학교

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