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An Optical Cavity Design for an Infrared Gas Detector Using an Off-axis Parabolic Mirror

  • Jeong, You-Jin (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Kang, Dong-Hwa (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Seo, Jae-Yeong (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Jo, Ye-Ji (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Seo, Jin-Hee (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Choi, Hwan-Young (School of Mechatronics Engineering, Korea University of Technology and Education) ;
  • Jung, Mee-Suk (Department of Nano-optical Engineering, Korea Polytechnic University)
  • Received : 2019.06.24
  • Accepted : 2019.07.30
  • Published : 2019.10.25

Abstract

This study examined a method for designing the optical cavity of a non-dispersive infrared gas detector. The infrared gas detector requires an optical cavity design to lengthen the ray path. However, the optical cavity with multiple reflecting surfaces has off-axis aberration due to the characteristics of the reflecting optical system. The rays were parallelized by using the off-axis parabolic mirror to easily increase the ray path and eliminate off-axis aberration so that the rays are admitted to the effective area of the infrared detector uniformly. A prototype of an infrared gas detector was produced with the designed optical cavity to confirm the performance.

Keywords

Off-axis parabolic mirror;Non-dispersive infrared;Gas detector

Acknowledgement

Supported by : Korea University of Technology and Education

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