Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Study of a Method for Measuring Hydrogen Gas Concentration Using a Photon-counting Raman Lidar System

광 계수 방식의 라만 라이다 시스템을 이용한 원격 수소 가스 농도 계측 방법에 대한 연구

  • Choi, In Young (Division of Quantum Optics, Korea Atomic Energy Research Institute) ;
  • Baik, Sung Hoon (Division of Quantum Optics, Korea Atomic Energy Research Institute) ;
  • Cha, Jung Ho (Division of R&D Center, Korea Nuclear Technology Co., Ltd.) ;
  • Kim, Jin Ho (Division of R&D Center, Korea Nuclear Technology Co., Ltd.)
  • 최인영 (한국원자력연구원 양자광학연구부) ;
  • 백성훈 (한국원자력연구원 양자광학연구부) ;
  • 차정호 ((주)한국원자력기술 기술연구소) ;
  • 김진호 ((주)한국원자력기술 기술연구소)
  • Received : 2019.03.06
  • Accepted : 2019.04.29
  • Published : 2019.06.25
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Abstract

This paper discusses the development of a Raman lidar system for remote detection and measurement of hydrogen gas by using a photon counter. The Raman signal of the hydrogen gas is very weak and has a very low signal-to-noise ratio. The photon counter has the advantage of improving the signal-to-noise ratio, because it has a discriminator to eliminate the background noise from the Raman signal of the hydrogen gas. Therefore, a small and portable Raman lidar system was developed using a low-power pulsed laser and a photon-counter system to measure the hydrogen gas concentration remotely. To verify the capability of measuring hydrogen gas using the developed photon-counting Raman lidar system, experiments were carried out using a gas chamber in which it is possible to adjust the hydrogen gas concentration. As a result, our photon-counting Raman lidar system is seen to measure a minimum concentration of 0.65 vol.% hydrogen gas at a distance of 10 m.

본 논문은 원격으로 수소 가스의 계측이 가능한 광 계수 방식의 소형 라만 라이다 시스템 개발에 관한 것이다. 수소 가스에 의한 라만 신호는 매우 미약한 신호로서, 신호 대 잡음비가 매우 낮다. 광 계수기는 광 판별기를 갖고 있어, 레이저에 의하여 발생한 배경 신호의 전기적 잡음을 제거할 수 있는 장점을 갖고 있다. 본 연구에서는 출력이 낮은 레이저와 광 계수기를 이용하여 소형의 라만 라이다 시스템을 개발하였다. 개발된 광 계수 방식의 라만 라이다 시스템의 원격 수소 가스 검출 능력을 증명하기 위하여 수소 가스 농도를 조절할 수 있는 가스 챔버를 이용하여 수소 가스 농도 측정 실험을 수행하였다. 그 결과 10 m 거리에서 최소 0.65 vol.%의 수소 가스 농도 검출이 가능하였다.

Keywords

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Fig. 1. Principle of the photon counting process.

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Fig. 2. 3D design lay-out of developed photon counting Raman lidar system.

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Fig. 3. Photon counting results at 100 vol.% of hydrogen gas concentration.

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Fig. 4. Results of the first experiment according to the variation of the hydrogen gas concentration.

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Fig. 5. Results of the second experiment according to the variation of the hydrogen gas concentration.

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Fig. 6. Results of the third experiment according to the variation of the hydrogen gas concentration.

Table 1. Comparison of the specification of previously invented Raman lidar system[1-9]

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Table 2. Specifications of developed photon counting Raman lidar system

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Table 3. Analysis results of the first experiment according to the variation of the hydrogen gas concentration

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Table 4. Analysis results of the second experiment according to the variation of the hydrogen gas concentration

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Table 5. Analysis results of the third experiment according to the variation of the hydrogen gas concentration

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Table 6. Results of the average error rate and standard deviation according to the experiment No.

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