Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Characteristics of an Optical Waveguide with Two Identical Elliptical Structures

두 개의 동일한 타원형 구조를 지닌 광 도파관의 특성

  • Jang, SeongHo (Department of Mechanical Eng., KNUT (Korea National University of Transportation)) ;
  • Chung, SangHo (Industry-Academic Cooperation Foundation, KNUT) ;
  • Yi, SeungHwan (RIC(Regional Innovation Center), KNUT)
  • 장성호 (한국교통대학교 기계공학과) ;
  • 정상호 (한국교통대학교 산학협력단) ;
  • 이승환 (한국교통대학교 지역혁신센터(RIC))
  • Received : 2014.03.31
  • Accepted : 2014.04.25
  • Published : 2014.04.30
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Abstract

A unique optical waveguide structure is proposed to enhance the optical characteristics of alcohol screening sensors. This structure is then simulated. The structure consists of two elliptical waveguides that have a common focus to one side and has an IR source and detector at each of the other focal points of the ellipses. When the angle between the two elliptical waveguides is increased from 30 degrees to 90 degrees, the maximum level of irradiance is greatly decreased, falling from $2.23{\times}10^6 W/m^2$ to $5.74{\times}10^5W/m^2$. However, the diameter of the incident rays is at a minimum of 1.86mm and the total incident flux is less than 10% lower when compared to the structure at $90^{\circ}$. It can be seen from the simulation results that this structure might enhance the sensitivity of an optical gas sensor which has a large absorption wavelength.

본 논문에서는 알코올 측정용 센서의 광학적 특성 향상을 위한 고유한 광학적 구조를 제안하였으며, 모의해석을 실시하였다. 광 도파관은 한쪽에 공통초점을 갖는 두 개의 타원형 광 도파관으로 구성되었으며, 각 광 도파관의 서로 다른 초점에 적외선 광원과 적외선 센서를 갖는다. 두 타원형 광 도파관의 각도가 30도에서 90도로 증가시켰을 때, 단위면적당 최대 입사광량은 $2.23{\times}10^6W/m^2$에서 $5.74{\times}10^5W/m^2$로 감소하였다. 그러나 조사 빔의 반지름은 1.86 mm로 최소값을 나타내었고, 전체 입사 에너지는 90도 각도를 갖는 구조와 비교하여 약 10 % 작은 값을 보였다. 모의해석 결과로부터 본 논문에 제안한 구조는 긴 흡수파장을 갖는 광학적 가스센서의 감도향상에 기여할 것으로 판단된다.

Keywords

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