Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Experiment and Analysis of Backscattering Signals According to Presence or Absence of Chloroform

클로로폼 침적 유무에 따른 후방산란신호 측정 실험 및 분석

  • Him Chan Seo (Department of Marine Sciences and Convergence Technology, Hanyang University) ;
  • Jee Woong Choi (Department of Marine Sciences and Convergence Engineering, Hanyang University-ERICA) ;
  • Yongmyung Kim (Korea Research Institute of Ships & Ocean Engineering) ;
  • Moonjin Lee (Korea Research Institute of Ships & Ocean Engineering)
  • 서힘찬 (한양대학교 해양융합과학과) ;
  • 최지웅 (한양대학교 ERICA 해양융합공학과) ;
  • 김용명 (선박해양플랜트연구소 해양안전환경연구본부) ;
  • 이문진 (선박해양플랜트연구소 해양안전환경연구본부)
  • Received : 2022.10.14
  • Accepted : 2022.12.28
  • Published : 2022.12.31
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Abstract

Because it is difficult to apply direct and optical detection techniques to sunken hazardous and noxious substances (HNS), effective acoustic detection techniques are required to detect sunken HNS in water. In this study, the possibility of acoustic detection of sunken HNS was investigated through backscattering signal measurement experiments using chloroform, a sunken HNS. After establishing a pool in an acrylic tank, backscattering signals were measured according to the presences or absence of chloroform by varying the grazing angle from 90° to 50° in 0.5° intervals using a pan&tilt system. A directional transducer transmitted and received sinusoidal signals with a frequency of 200 kHz and a pulse length of 25 ㎲ in a monostatic state. When chloroform was deposited, the received level of the backscattering signal at the interface between water and chloroform became low at a grazing angle of approximately 80° or smaller. Based on the backscattering signal results obtained at the interface between water and chloroform, the possibility of acoustic detection of sunken HNS was demonstrated.

저층 침적 위험·유해물질(Hazardous and Noxious Substances)은 해저에 침적되는 위험·유해물질로 직접 및 광학 탐지 기법의 적용이 어렵기 때문에 수중에서 효과적인 음향 탐지 기법 적용이 요구된다. 본 연구에서는 저층 침적 위험·유해물질인 클로로폼(Chloroform)을 이용한 후방산란신호 측정 실험을 통해 저층 침적 위험·유해물질 음향 탐지 가능성을 확인하였다. 제작된 아크릴 수조 내에 지점토를 이용하여 웅덩이를 만든 후 Pan&Tilt를 이용하여 수평입사각을 90°에서 50°까지 0.5° 간격으로 변화시켜가며 클로로폼 유무에 따른 후방산란신호 측정이 수행되었다. 송수신기를 단상태로 주파수 200 kHz, 신호길이 25 ㎲인 정현파 신호를 이용하여 송수신하였으며, 클로로폼 유무에 따른 후방산란신호를 측정하였다. 클로로폼이 침적된 경우 수평입사각 약 80°이하에서 물과 클로로폼 경계면에서의 후방산란신호 수신준위가 작아지는 것이 확인되었다. 물과 클로로폼 경계면에서의 후방산란신호 측정된 결과를 통해 저층 침적 위험·유해물질 음향 탐지 가능성을 확인하였다.

Keywords

Acknowledgement

이 논문은 2022년도 해양수산부 재원으로 해양수산과학기술진흥원의 지원을 받아 수행된 연구임(20150340, 위험·유해물질(HNS)사고 관리기술개발).

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