Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Study of the Reflector Shape of a Test Lamp for a Flame Detector with Little Influence of Error in Optical-system Fabrication

광학계 제작 시 오차 영향이 적은 불꽃감지기용 테스트램프 반사경 형상에 관한 연구

  • Park, Hye-Jin (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Kang, Dong-Hwa (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Kong, Mi-Seon (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Kim, Eun-Ji (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Lee, Ye-Eun (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Jo, Ye-Ji (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Jung, Mee-Suk (Department of Nano-optical Engineering, Korea Polytechnic University)
  • 박혜진 (한국산업기술대학교 나노-광공학과) ;
  • 강동화 (한국산업기술대학교 나노-광공학과) ;
  • 공미선 (한국산업기술대학교 나노-광공학과) ;
  • 김은지 (한국산업기술대학교 나노-광공학과) ;
  • 이예은 (한국산업기술대학교 나노-광공학과) ;
  • 조예지 (한국산업기술대학교 나노-광공학과) ;
  • 정미숙 (한국산업기술대학교 나노-광공학과)
  • Received : 2018.11.01
  • Accepted : 2018.11.21
  • Published : 2018.12.25
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Abstract

In this paper, a design method to reduce fabrication errors in reflector shape of a test lamp for a flame detector is carried out. Although the test lamp should be operated in parallel with a high-intensity light, it is difficult to fix the small reflector that controls the central light during fabrication. To solve these problems, a small spherical reflector is designed to minimize the performance degradation for a light loss factor of less than 5%, even during tilt and decenter, and a spherical shape is proposed for a small reflector with little effect on the error when designing the optical system.

본 논문에서는 불꽃감지기용 테스트램프의 반사경 형상에 대해 제작 시 오차를 줄일 수 있는 설계 방법 연구를 진행하였다. 테스트램프는 높은 광량의 빛을 평행하게 진행시켜야 하지만, 제작 시 중앙 빛을 제어하는 소형 반사경의 고정이 어렵다는 단점으로 인해 광량 저하가 발생하여 목표 광량을 만족하지 못하는 경우가 많다. 이러한 문제점 해결을 위해 틸트 및 디센터 시에도 성능 저하 현상을 최소화하는 방향으로 광 손실률 5% 미만의 구 소형 반사경 설계를 진행하였고, 설계 분석 결과에 따라 광학계 제작 시에도 오차 영향이 적은 소형 반사경으로 구체 형상을 제시하였다.

Keywords

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Fig. 1. Halogen lamp. (a) Halogen lamp shape, (b) Wavelength band graph.

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Fig. 2. Existing reflector shape for test lamp.

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Fig. 3. Illuminance distribution of existing test lamp.

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Fig. 4. Tilting spherical small size reflector.

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Fig. 5. Decentering spherical small size reflector.

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Fig. 6. 1st large size reflector shape with outside light source.

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Fig. 7. Illuminance distribution of 1st large size reflector.

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Fig. 8. Spherical small size reflector layout.

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Fig. 9. 2nd large size reflector shape. (a) Parabolic equation, (b) Reflector designed with a fitted curve.

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Fig. 10. 2nd large size reflector and spherical small size reflector.

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Fig. 11. Illuminance distribution of test lamp using spherical small size reflector.

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Fig. 12. Optical system using lens layout of test lamp.

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Fig. 13. Illuminance distribution of test lamp using lens.

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Fig. 14. Small size reflector type of analysis. (a) Accurate position, (b) Alpha 5° tilt, (c) Up 5 mm decenter, (d) Side 5 mm decenter, (e) Tilt and decenter.

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Fig. 15. Illuminance of tilt and decenter with small size reflector shape.

Table 1. Specification of test lamp for flame detector

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Table 2. Analysis of an inaccurately positioned existing reflector test lamp

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Table 3. Reflector length by emission angle and efficiency per range

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Table 4. Illuminance according to compact reflector and lens shape

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Table 5. Analysis of an inaccurately positioned spherical small reflector test lamp

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References

  1. J. Penny, "The roles of flame detection in AFD," Fire Surveyor 15, 25-26 (1996).
  2. G. W. Mulholland, "SFPE handbook of fire protection engineering," National Fire Protection Association, Wuincy, Massachuserrs, 3rd Edition (2002).
  3. Ministry of government administration and home affairs' Notification, "National fire safety code of automatic detection system," No. 2004-20 (2004).
  4. B. H. Lim, "A study on the improvement of the characteristic of ultraviolet infrared flame detector for fire detection," Dept. of Control and Instrumentation Eng., Graduate School of Chosun University (2006), p. 1.
  5. J. H. Jung, M. S. Kim, H. S. Lim, and Y. S. Kim, "A study on accelerated life test of halogen lamps for medical device," J. Korean Soc. Qual. Manage. 41, 659-672 (2013). https://doi.org/10.7469/JKSQM.2013.41.4.659
  6. J. S. Park and S. H. Yi, "Speculation of optical cavity for improving optical gas sensor's characteristics," J. Korean Inst. Gas 12, 63-64 (2008).
  7. M. S. Cho, "Development of 3D reflector design method for compact metal halide street lighting," Dept. of Electrical Engeneering Graduate School, Kangwom National University (2007), p. 10.
  8. H. Haber, "Focusing properties of spherical and parabolic mirrors," Santa Cruz Institute for Particle Physics (2009), pp. 2-3.
  9. J. H. Kim, "Optical system design of mobile phone camera for sensitivity analysis," Dept. of Physics, Graduate School, Kookmin University, Seoul (2009), p. 17.