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2025 Vol.41, Issue 6 Preview Page
Development and Evaluation of a Ground CO2 Measurement System

이산화탄소(CO2) 측정 시스템의 개발 및 적용성 평가

Keunbo Park1*
박 근보1*
1Member, Research Scientist, Dept. of Ocean and Atmosphere, Korea Polar Research Institute
1정회원, 극지연구소 해양대기연구본부 연구원
*Corresponding Author
31 December 2025. pp. 297-306
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Abstract

Demand has increased for field-deployable, high-precision instruments to quantify CO2 exchange at the permafrost–atmosphere interface. To meet this need, we developed a CO2 analyzer based on non-dispersive infrared (NDIR) spectroscopy integrated with an MCU-based controller, a real-time compensation algorithm, a communication module, and a GUI-based visualization system to ensure stable field operation. The system incorporates zero and span calibrations with standard gases, moving-average and adaptive signal filtering, anomaly detection, and continuous data logging to improve robustness. Performance was evaluated using CO2 standards at 0.600 ppm, 429.86 ppm, and 953.55 ppm; metrics assessed included accuracy, precision, response time, linearity, and zero stability. Experimental results show close agreement with reference concentrations across the tested range and performance comparable to a commercial high-precision system (LI-COR LI-7810), including accuracy within ±1%, precision better than 0.560, and minimal long-term zero drift. A 1:1 comparison confirmed excellent linearity and high correlation between the instruments.

Keywords
Permafrost
Greenhouse gas
Carbon dioxide
Nondispersive infrared CO2 sensor
Sensor controller

지구 평균 기온 상승은 산업화 이후 증가한 온실가스 배출과 밀접한 관련이 있으며, 특히 고위도 지역의 영구동토층 해빙은 저장된 유기탄소의 대기 방출을 통해 지구가열화를 가속할 잠재성이 크다. 이에 따라 동토–대기 경계면에서 발생하는 CO2 교환 특성을 정량적으로 규명하기 위한 정밀 현장 관측 기술의 필요성이 증대되고 있다. 본 연구에서는 이러한 과학적·정책적 요구에 대응하여 비분산적외선(NDIR) 분광 원리를 기반으로 한 정밀 CO2 측정시스템을 설계·제작하였다. 측정 시스템은 MCU 기반 제어기, 실시간 보정 알고리즘, 통신 모듈 및 GUI 기반 시각화 시스템을 통합하여 안정적으로 운용 가능하도록 구현하였다. 개발된 측정 시스템은 표준가스를 이용한 영점 및 스팬 교정 기능을 포함하며, 이동평균 및 적응형 필터 기반 신호 처리, 비정상 신호 제거 알고리즘, 실시간 데이터 로깅 기능을 적용하였다. 성능 검증은 0.600 ppm, 429.860 ppm, 953.550 ppm의 CO2 표준가스를 이용해 정확도, 정밀도, 응답시간, 선형성 및 영점 안정성을 평가하는 방식으로 수행하였다. 실험 결과, 모든 농도 구간에서 측정값은 표준가스 농도와 일치하는 수준을 유지하였으며, 정확도 ±1% 이내, 정밀도 0.560 이하, 장기 영점 드리프트를 포함하여 상용되고 있는 정밀 측정 시스템(LI-COR LI-7810)와 동등한 성능을 확보하였다. 또한 1:1 비교 분석에서 두 장비의 측정값은 높은 상관성을 보이며 우수한 선형성을 나타냈다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 41
  • No :6
  • Pages :297-306
  • Received Date : 2025-12-03
  • Revised Date : 2025-12-10
  • Accepted Date : 2025-12-15
  • DOI :https://doi.org/10.7843/kgs.2025.41.6.297
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