한국항공우주학회지 (Journal of the Korean Society for Aeronautical & Space Sciences)

  • 제48권6호
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  • Pages.479-487
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  • 2020
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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우주 탐사를 위한 이중펄스 라만-레이저 유도 플라즈마 분광 시스템 개발 연구

Double Pulse Raman-Laser Induced Plasma Spectroscopy System for Space Exploration

  • Yang, Jun-Ho (Department of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Yoh, Jai-Ick (Department of Mechanical and Aerospace Engineering, Seoul National University)
  • 투고 : 2020.02.12
  • 심사 : 2020.04.29
  • 발행 : 2020.06.01
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⟨ 이전 논문 다음 논문 ⟩

초록

본 논문에서는 라만 분광법과 레이저 유도 플라즈마 분광법(LIPS)을 단일 유닛으로 결합한 새로운 형태의 이중 펄스 레이저 시스템을 제안하였다. 본 연구는 라만 분광법으로부터 분자 신호를 추출하면서, 동시에 레이저 유도 플라즈마 방출 신호를 향상시키고자 하였다. 달의 대기압과 같은 저압 조건에서는 플라즈마 신호 검출은 낮은 전자 밀도와 짧은 지속시간, 빠른 플라즈마 팽창 때문에 어려움을 마주치게 된다. 또한, 우주 탐사를 목표로 하는 검출 시스템의 통합에서, 레이저 시스템의 무게 최소화는 payload의 무게 측면에서 중요하다. 0.07 torr 미만의 저압 조건에서 높은 분해능의 스펙트럼 데이터를 제공하는 본 연구의 동시 분자 및 원자 검출방식은 8개의 암석을 이용하여 증명되었다. 이중 펄스 레이저로부터 생성된 연속된 플라즈마는 종래의 플라즈마 분광과 비교하여 방해석의 산소와 칼슘 신호를 2배 향상시킬 수 있었다.

A new double-pulse laser system that combines Raman and laser induced plasma spectroscopy (LIPS) in a single unit is proposed. The study attempts to enhance the laser induced plasma signals while simultaneously extracting the desired molecular signals from Raman spectroscopy. In low pressure conditions such as the lunar atmosphere, the measuring of plasma emission is hard because of the low electron density and short persistence time causing a rapid plasma expansion. Furthermore, in the integration of the detecting system aimed at space exploration, the minimization of laser system is important in terms of the payload mass. Simultaneous molecular and atomic detection that gave highly resolved spectral data at pressure below 0.07 torr is demonstrated amongst eight rock samples test. The plasma stacking produced from the double-pulse laser enhanced the signal intensity of calcium and oxygen lines in calcite matrix by twofold, compared to a conventional LIPS.

키워드

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