Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Development of Raman LIDAR System to Measure Vertical Water Vapor Profiles and Comparision of Raman LIDAR with GNSS and MWR Systems

수증기의 연직 분포 측정을 위한 라만 라이다 장치의 개발 및 GNSS, MWR 장비와 상호 비교연구

  • Park, Sun-Ho (Hanbat National University, Division of Cultural Studies) ;
  • Kim, Duk-Hyeon (Hanbat National University, Division of Cultural Studies) ;
  • Kim, Yong-Gi (Kongju National University, Department of Physics) ;
  • Yun, Mun-Sang (Kongju National University, Department of Physics) ;
  • Cheong, Hai-Du (Hanbat National University, Division of Cultural Studies)
  • Received : 2011.09.26
  • Accepted : 2011.11.02
  • Published : 2011.12.25
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Abstract

A Raman LIDAR system has been designed and constructed for quantitative measurement of water vapor mixing ratio. The comparison with commercial microwave radiometer and global navigation satellite system(GNSS) was performed for the precipitable water vapor(PWV) profile and total PWV. The result shows that the total GNSS-PWV and LIDAR-PWV have good correlation with each other. But, there is small difference between the two methods because of maximum measurement height in LIDAR and the GNSS method. There are some significant differences between Raman and MWR when the water vapor concentration changes quickly near the boundary layer or at the edge of a cloud. Finally we have decided that MWR cannot detect spatial changes but LIDAR can measure spatial changes.

수증기의 혼합비를 측정하기 위하여 라만 라이다 시스템을 설계 제작하였다. 시스템을 검증하기 위하여 가강수량과 분포에 대하여 상용 마이크로파 라이오메터(MWR)와 GPS 신호를 이용하는 방법과 비교 연구를 수행하였다. GNSS 방법으로 측정한 총가강수량과 본 라이다 방법에서는 작은 차이를 보였는데, 이는 라이다 방법으로 얻을 수 있는 수증기의 측정고도가 제한적이기 때문이다. 반면에 MWR 방법과 라이다 방법으로 얻은 고도에 따른 수증기량은 수증기량이 급격하게 변하는 구름 경계나 경계고도 근처에서 심한 차이를 보이고 있었다. MWR은 그 밀도가 급격하게 변하는 곳에서 취약한 점을 보였으나 개발된 라만 라이다의 경우는 그 밀도가 급격히 변하는 곳에서도 측정이 원활하게 이루어지고 있음을 알 수 있었다.

Keywords

References

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